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Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
by
Bill Tandler
A SmartGD&T Workshop
Spatial 3D Insider’s SummitBoulder 2008
GD&T Fundamentalsand potential Automation in
CAD/CAM/CAI
TM
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
Workshop Overview
1. What is GD&T?
2. The Perfect Imaginary World of GD&T
3. A GD&T Encoded Part
4. GD&T – Design, Mfg. & Metrology Connections
5. The Anatomy of a Feature Control Frame
6. Feature Control Frame Decoding
7. The Datum Reference Frame Establishment Process
SmartGD&T™
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
What is GD&T?
$
$ $
$ $
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
Many people think GD&T is
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
Grim, Depressing & Troublesome
Many people think GD&T is
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
and a fine way to waste a
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
and a fine way to waste a
Great Deal of Time
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
Others think GD&T is the
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
Greatest Design Tool
ever !
Others think GD&T is the
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
But in fact,
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
But in fact, GD&Tis the only tool we have for
managing imperfect geometry
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
perfectly!
But in fact, GD&Tis the only tool we have for
managing imperfect geometry
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
Purpose of GD&T
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
Most people would say . . .
The main purpose of GD&T is to communicate Design intent unambiguously to manufacturing and inspection.
Purpose of GD&T
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
The primary purpose of GD&T, is to ensure that what we communicate to manufacturing and inspection is worth communicating, namely represents functional, assemblable parts.
but in fact . . .
Purpose of GD&T
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
Or, in greater detail . . .
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
GD&T is a symbolic language for
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
GD&T is a symbolic language for
1. researching
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
GD&T is a symbolic language for
1. researching2. refining and
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
GD&T is a symbolic language for
1. researching2. refining and3. encoding
the function of each feature of a part in Design,
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
GD&T is a symbolic language for
1. researching2. refining and3. encoding
the function of each feature of a part in Design,in order - through decoding - to
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
GD&T is a symbolic language for
1. researching2. refining and3. encoding
the function of each feature of a part in Design,
1. guarantee assemblability and operability prior to drawing release
in order - through decoding - to
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
GD&T is a symbolic language for
1. researching2. refining and3. encoding
the function of each feature of a part in Design,
1. guarantee assemblability and operability prior to drawing release
2. set reduce cost and set precise objectives for manufacturing, and
in order - through decoding - to
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
GD&T is a symbolic language for
1. researching2. refining and3. encoding
the function of each feature of a part in Design,
1. guarantee assemblability and operability prior to drawing release
2. set reduce cost and set precise objectives for manufacturing, and
3. turn inspection and manufacturing process feedback into truly scientific processes
in order - through decoding - to
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
In fact,without GD&T
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
1. Reliable Tolerance Stack-Up Analysis is impossible . . .
In fact,without GD&T
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
1. Reliable Tolerance Stack-Up Analysis is impossible . . .
2. Manufacturing is a guessing game based on tribal understandings . . .
In fact,without GD&T
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
1. Reliable Tolerance Stack-Up Analysis is impossible . . .
2. Manufacturing is a guessing game based on tribal understandings . . .
3. All inspection is pure invention on the part of the inspector.
In fact,without GD&T
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
A question . . .
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
Did you notice the use of the words
“encoding” and “decoding”
?
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
Another question . . .
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
Have you ever asked two or three colleagues for help
“interpreting”GD&T ?
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
. . . and gotten two or three
Have you ever asked two or three colleagues for help
“interpreting”GD&T ?
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
. . . and gotten two or three
“different interpretations”
?
Have you ever asked two or three colleagues for help
“interpreting”GD&T ?
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
Surely if GD&T is used to decorate drawings for later
“interpretation”
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
Surely if GD&T is used to decorate drawings for later
“interpretation”
it is useless!
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
$
$
$and because machine shops know that most GD&T is purely decorative, they have to charge more to cover the cost of ensuring that their interpretations are in
line with those of their customers.
Surely if GD&T is used to decorate drawings for later
“interpretation”
it is useless!
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
Now for some insights into
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
The Simplicitybut
Uselessness of CD&T
(Classical Dimensioning &Tolerancing)
Now for some insights into
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
The Classical tool kitconsists of only one tool, namely the
toleranced nominal dimension 50 ± 1
But is one tool enough?Ø20±0.2 Ø30±0.2
18±0.1
25±0.1
15±0.1
45±1
45±0.5
140±0.5
45±0.145±0.1
Ø16.5±0.2
25±130±0.5
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
Although perfectly capable of controlling size, the classical alternative . . .
Technical Disadvantages of Classical Tolerancing
Ø20±0.2 Ø30±0.2
18±0.1
25±0.1
15±0.1
45±1
45±0.5
140±0.5
45±0.145±0.1
Ø16.5±0.2
25±130±0.5
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
1) does not clearly define coordinate systems, 2) does not differentiate between reference and controlled features,3) controls the location of bores with square instead of round tolerance zones,4) provides no means of linking location tolerances to feature size,5) provides no means for controlling compound curved surfaces,6) provides no means for managing feature form,7) provides no means for researching and refining part functionality, and8) provides no means for guaranteeing the assemblability of mating parts.
Although perfectly capable of controlling size, the classical alternative . . .
Technical Disadvantages of Classical Tolerancing
Ø20±0.2 Ø30±0.2
18±0.1
25±0.1
15±0.1
45±1
45±0.5
140±0.5
45±0.145±0.1
Ø16.5±0.2
25±130±0.5
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
Classical Tolerancing leaves us beholden to
Tribal Understandings&
Interpretation
As a result . . .
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
How does GD&T compare ?
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
The Frustrationsand
Power of GD&T
(Geometric Dimensioning &Tolerancing)
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
GD&T Frustrations
1. GD&T is Complex.
2. GD&T is Sporadically used.
3. GD&T is often used to “decorate” drawings, rather than “encode” function.
4. GD&T is often “interpreted” rather than “decoded”.
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
GD&T Opportunities
1. GD&T encourages fault tolerant designs and can guarantee assemblability.
2. GD&T reduces Mfg. cost through unambiguous communication and looser tolerances.
3. GD&T turns 3D Metrology into a reliable, scientific process for the first time.
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
The GD&T tool kit
A
45
40
25 18
CB
A
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
The GD&T tool kit
A
45
Geometry Control Tools
40
25 18
CB
A
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
The GD&T tool kit
A
45
Geometry Control Tools Feature Control Frames
40
25 18
CB
A
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
The GD&T tool kit
A
45
Geometry Control Tools Feature Control FramesBasic Dimensions, and
40
25 18
CB
A
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
The GD&T tool kit
A
45
Geometry Control Tools Feature Control FramesBasic Dimensions, andDatum Feature Labels
40
25 18
CB
A
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
1) clearly defines coordinate systems, 2) clearly differentiates between reference and controlled features,3) controls the location of bores with cylindrical tolerance zones,4) links location tolerances to feature size using (M) and (L) Modifiers5) provides powerful tools for controlling compound curved surfaces,6) provides powerful tools for managing feature form,7) provides powerful means for researching and refining part functionality, and8) through tolerance stack-up analysis, makes it possible to guarantee assemblability.
GD&T is perfectly capable of controlling size, and . . .
Technical Advantages of GD&T
15
25
4545
D
A
45
25
E
ALL OVER
30
25
B
C
45
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
GD&T liberates us from
Tribal Understandings&
Interpretation
As a result . . .
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
Now for some
Fundamental GD&T Concepts
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
The Perfect
Imaginary World
of GD&T
Let’s take a closer look at
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
The Perfect Imaginary World of GD&T
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
The Perfect Imaginary World of GD&T
1. Tolerance ZonesBounded regions of space within which a particular component of a feature is required to lie.
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
The Perfect Imaginary World of GD&T
1. Tolerance ZonesBounded regions of space within which a particular component of a feature is required to lie.
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
The Perfect Imaginary World of GD&T
1. Tolerance ZonesBounded regions of space within which a particular component of a feature is required to lie.
Tube-like
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
The Perfect Imaginary World of GD&T
1. Tolerance ZonesBounded regions of space within which a particular component of a feature is required to lie.
Tube-likeCylindrical
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
The Perfect Imaginary World of GD&T
1. Tolerance ZonesBounded regions of space within which a particular component of a feature is required to lie.
Tube-like
Slab-like
Cylindrical
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
The Perfect Imaginary World of GD&T
1. Tolerance ZonesBounded regions of space within which a particular component of a feature is required to lie.
2. Tolerance ValuesThe sizes of tolerance zones.
Tube-like
Slab-like
Cylindrical
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
The Perfect Imaginary World of GD&T
1. Tolerance ZonesBounded regions of space within which a particular component of a feature is required to lie.
2. Tolerance ValuesThe sizes of tolerance zones.
Wall ThicknessTube-like
Slab-like
Cylindrical
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
The Perfect Imaginary World of GD&T
1. Tolerance ZonesBounded regions of space within which a particular component of a feature is required to lie.
2. Tolerance ValuesThe sizes of tolerance zones.
Wall ThicknessDiameter
Tube-like
Slab-like
Cylindrical
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
Wall ThicknessDiameter
Width
The Perfect Imaginary World of GD&T
1. Tolerance ZonesBounded regions of space within which a particular component of a feature is required to lie.
2. Tolerance ValuesThe sizes of tolerance zones.
Tube-like
Slab-like
Cylindrical
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
The Perfect Imaginary World of GD&T
Wall ThicknessDiameter
Width
Tube-like
Slab-like
Cylindrical1. Tolerance ZonesBounded regions of space within which a particular component of a feature is required to lie.
2. Tolerance ValuesThe sizes of tolerance zones.
3. Datums Perfect imaginaryreference points, lines and planes.
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
The Perfect Imaginary World of GD&T
1. Tolerance ZonesBounded regions of space within which a particular component of a feature is required to lie.
2. Tolerance ValuesThe sizes of tolerance zones.
3. Datums Perfect imaginaryreference points, lines and planes.
Wall ThicknessDiameter
Width
Tube-like
Slab-like
Cylindrical
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
The Perfect Imaginary World of GD&T
1. Tolerance ZonesBounded regions of space within which a particular component of a feature is required to lie.
2. Tolerance ValuesThe sizes of tolerance zones.
3. DatumsReference points, lines and planes.
4. Coordinate SystemsFrames of reference for orienting and locating tolerance zones.
Wall ThicknessDiameter
Width
Tube-like
Slab-like
Cylindrical
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
Y X
Z
The Perfect Imaginary World of GD&T
1. Tolerance ZonesBounded regions of space within which a particular component of a feature is required to lie.
2. Tolerance ValuesThe sizes of tolerance zones.
3. DatumsReference points, lines and planes.
4. Coordinate SystemsFrames of reference for orienting and locating tolerance zones.
Wall ThicknessDiameter
Width
Tube-like
Slab-like
Cylindrical
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
The Perfect Imaginary World of GD&T
Y X
Z
1. Tolerance ZonesBounded regions of space within which a particular component of a feature is required to lie.
2. Tolerance ValuesThe sizes of tolerance zones.
3. DatumsReference points, lines and planes.
4. Coordinate SystemsFrames of reference for orienting and locating tolerance zones.
5. Basic DimensionsTools for orienting and locating tolerance zones.
Wall ThicknessDiameter
Width
Tube-like
Slab-like
Cylindrical
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
50 70
The Perfect Imaginary World of GD&T
Y X
Z
1. Tolerance ZonesBounded regions of space within which a particular component of a feature is required to lie.
2. Tolerance ValuesThe sizes of tolerance zones.
3. DatumsReference points, lines and planes.
4. Coordinate SystemsFrames of reference for orienting and locating tolerance zones.
5. Basic DimensionsTools for orienting and locating tolerance zones.
Wall ThicknessDiameter
Width
Tube-like
Slab-like
Cylindrical
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
50 70
The Perfect Imaginary World of GD&T
Y X
Z
1. Tolerance ZonesBounded regions of space within which a particular component of a feature is required to lie.
2. Tolerance ValuesThe sizes of tolerance zones.
3. DatumsReference points, lines and planes.
4. Coordinate SystemsFrames of reference for orienting and locating tolerance zones.
5. Basic DimensionsTools for orienting and locating tolerance zones.
6. A symbolic LanguageSets of Geometry Control Tools for imposing the perfect imaginary world on the imperfect real world.
Wall ThicknessDiameter
Width
Tube-like
Slab-like
Cylindrical
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
50 70
The Perfect Imaginary World of GD&T
Y X
Z
Diameter ToolPosition Tool
Cylindricity Tool
Wall ThicknessDiameter
Width
Tube-like
Slab-like
Cylindrical1. Tolerance ZonesBounded regions of space within which a particular component of a feature is required to lie.
2. Tolerance ValuesThe sizes of tolerance zones.
3. DatumsReference points, lines and planes.
4. Coordinate SystemsFrames of reference for orienting and locating tolerance zones.
5. Basic DimensionsTools for orienting and locating tolerance zones.
6. A symbolic LanguageSets of Geometry Control Tools for imposing the perfect imaginary world on the imperfect real world.
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
Now let’s put it all to work . . .
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
Here’s a partially GD&T encoded drawing, . . .
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
Here’s a partially GD&T encoded drawing, . . .
B
C
25
A
50
50
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
Datum Feature Labels
B
C
25
A
50
50
Here’s a partially GD&T encoded drawing, . . .
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
Datum Feature Labelsidentify the functionally most important features of a part.
B
C
25
A
50
50
Here’s a partially GD&T encoded drawing, . . .
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
Geometry Control Tools
B
C
25
A
50
50
Here’s a partially GD&T encoded drawing, . . .
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
Geometry Control Toolscontrol the size, form, orientation and
location of part features
B
C
25
A
50
50
Here’s a partially GD&T encoded drawing, . . .
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
Feature Control Frames
B
C
25
A
50
50
Here’s a partially GD&T encoded drawing, . . .
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
Feature Control Frames specify tolerance zones and
coordinate systems
B
C
25
A
50
50
Here’s a partially GD&T encoded drawing, . . .
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
B
C
25
A
50
50
In Particular
Here’s a partially GD&T encoded drawing, . . .
Feature Control Frames specify tolerance zones and
coordinate systems
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
B
C
25
A
50
50
In Particular
Here’s a partially GD&T encoded drawing, . . .
Tolerance Zone Shape
Feature Control Frames specify tolerance zones and
coordinate systems
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
B
C
25
A
50
50
Feature Control Frames specify tolerance zones and
coordinate systems
Here’s a partially GD&T encoded drawing, . . .
Tolerance Zone Shape
Tolerance Zone Size
In Particular
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
B
C
25
A
50
50
Feature Control Frames specify tolerance zones and
coordinate systems
Here’s a partially GD&T encoded drawing, . . .
Tolerance Zone ShapeCoordinate System Establishment Instructions
Tolerance Zone Size
In Particular
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
Basic Dimensions
B
C
25
A
50
50
Here’s a partially GD&T encoded drawing, . . .
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
Basic Dimensionslocate tolerance zones
B
C
25
A
50
50
Here’s a partially GD&T encoded drawing, . . .
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
B
C
25
A
50
50
. . . and here’s the actual part, . . .
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
X(A,B,C)Z(A,B,C)
25
50
Y(A,B,C)
50
B
C
25
A
50
50
. . . and here are the GD&T defined Tolerance Zones !
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
X(A,B,C)Z(A,B,C)
25
50
Y(A,B,C)
50
B
C
25
A
50
50
A slab-like Flatness
Tolerance Zone
. . . and here are the GD&T defined Tolerance Zones !
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
X(A,B,C)Z(A,B,C)
25
50
Y(A,B,C)
50
B
C
25
A
50
50
A slab-like Perpendicularity Tolerance Zone
. . . and here are the GD&T defined Tolerance Zones !
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
X(A,B,C)Z(A,B,C)
25
50
Y(A,B,C)
50
B
C
25
A
50
50
A tube-like Diameter
Tolerance Zone
. . . and here are the GD&T defined Tolerance Zones !
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
X(A,B,C)Z(A,B,C)
25
50
Y(A,B,C)
50
B
C
25
A
50
50
A cylindrical Position
Tolerance Zone
. . . and here are the GD&T defined Tolerance Zones !
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
Now a quick overview of
The GD&T – Design Connection
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
Now a quick overview of
The GD&T – Design Connection
1. Encourages aggressive feature function analysis
2. Encourages fault tolerant design
3. Supports truly Functional Datum Feature selection
4. Requires effective Geometry Control Tool selection
5. Encourages balanced Tolerance value selection to guarantee Operability, Assemblability & Manufacturability
6. Permits truly functional Tolerance Stack-Up Analysis (TSUPA™) to guarantee functionality prior to model release
Important Concepts & Processes
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
Now a quick overview of
The GD&T – Manufacturing Connection
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
Now a quick overview of
The GD&T – Manufacturing Connection
1. Enables reliable manufacturing process planning through unique Feature Control Frame decoding
2. Permits aggressive Design feedback on questionable call-outs
3. Requires religious use of specified Datum Features where possible
4. Allows use of Temporary Datum Features where necessary
5. Enables scientific manufacturing process quality assessment
Important Concepts & Processes
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
Now a quick overview of
The GD&T – Metrology Connection
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
Now a quick overview of
The GD&T – Metrology Connection
Important Concepts & Processes
1. Completely defines CMM based inspection processes through potentially fully automated Feature Control Frame decoding
2. Essentially automates Functional Gage design
3. Requires adequate raw data point cloud densities
4. Requires adequate raw data accuracy – at least 20X the tightest tolerance value
5. Permits fully automated Rule based Datum Reference Frame establishment
6. Enables strict, Rule based Actual Value processing
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
Clearly Functional GD&T is essential for reliable manufacturing and metrology processes
Clearly
bad GD&Tis nothing but trouble !
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
Primary Focuses in this presentation:
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
1. Feature Control Frame Anatomy
2. Material Condition Modifier clarifications
3. Feature Control Frame decoding
4. Datum Feature, Datum Feature Simulator and Datum definitions
5. Rules for Datum Feature Simulation and Datum Reference Frame establishment
6. The Datum Reference Frame establishment Process.
Primary Focuses in this presentation:
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
Let’s start with the
Anatomyof a
Feature Control Frame
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
Feature Control Frame Anatomy
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
Feature Control Frame Anatomy
Ø0.5 M A B S C M
Feature Control Frames have three major compartments
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
Feature Control Frame Anatomy
Ø0.5 M A B S C M
Feature Control Frames have three major compartments
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
Feature Control Frame Anatomy
1. Specifies the Geometry Control Tool
Ø0.5 M A B S C M
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
Feature Control Frame Anatomy
2. Specifies the Tolerance Zone
Ø0.5 M A B S C M
1. Specifies the Geometry Control Tool
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
Feature Control Frame Anatomy
3. Specifies the Datum Reference Frame Establishment Process
Ø0.5 M A B S C M
1. Specifies the Geometry Control Tool
2. Specifies the Tolerance Zone
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
Feature Control Frame Anatomy
Ø0.5 M A B S C M
Tolerance Zone Shape
1. Specifies the Geometry Control Tool
3. Specifies the Datum Reference Frame Establishment Process
2. Specifies the Tolerance Zone
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
Feature Control Frame Anatomy
Tolerance Zone Shape
Tolerance Zone Size
Ø0.5 M A B S C M
1. Specifies the Geometry Control Tool
3. Specifies the Datum Reference Frame Establishment Process
2. Specifies the Tolerance Zone
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
Feature Control Frame Anatomy
Tolerance Zone Shape
Tolerance Zone Size
Ø0.5 M A B S C M
Tolerance Zone Size Modifier
1. Specifies the Geometry Control Tool
3. Specifies the Datum Reference Frame Establishment Process
2. Specifies the Tolerance Zone
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
Feature Control Frame Anatomy
PrimaryDatum Feature
Ø0.5 M A B S C M
Tolerance Zone Size Modifier
Tolerance Zone Shape
Tolerance Zone Size
1. Specifies the Geometry Control Tool
3. Specifies the Datum Reference Frame Establishment Process
2. Specifies the Tolerance Zone
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
Feature Control Frame Anatomy
PrimaryDatum Feature
SecondaryDatum Feature
Ø0.5 M A B S C M
Tolerance Zone Size Modifier
Tolerance Zone Shape
Tolerance Zone Size
1. Specifies the Geometry Control Tool
3. Specifies the Datum Reference Frame Establishment Process
2. Specifies the Tolerance Zone
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
Feature Control Frame Anatomy
PrimaryDatum Feature
SecondaryDatum Feature
TertiaryDatum Feature
Ø0.5 M A B S C M
Tolerance Zone Size Modifier
Tolerance Zone Shape
Tolerance Zone Size
1. Specifies the Geometry Control Tool
3. Specifies the Datum Reference Frame Establishment Process
2. Specifies the Tolerance Zone
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
Feature Control Frame Anatomy
Tolerance Zone Size Modifier
Tolerance Zone Mobility Modifiers
PrimaryDatum Feature
SecondaryDatum Feature
TertiaryDatum Feature
Ø0.5 M A B S C M
Tolerance Zone Shape
Tolerance Zone Size
1. Specifies the Geometry Control Tool
3. Specifies the Datum Reference Frame Establishment Process
2. Specifies the Tolerance Zone
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
Ø0.5 M A B S C M
Material Condition Modifier Effects
Tolerance Zone SizeModifiers Ø25±1
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
Ø0.5 M A B S C M
Material Condition Modifier Effects
Tolerance Zone SizeModifiers
Impact on the Tolerance Zone The Encoded Function
Ø25±1
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
Ø0.5 M A B S C M
Material Condition Modifier Effects
Tolerance Zone SizeModifiers
M
Impact on the Tolerance Zone
M ore tolerance
The Encoded Function
Ø25±1
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
Ø0.5 M A B S C M
Material Condition Modifier Effects
Tolerance Zone SizeModifiers
M
Impact on the Tolerance Zone
M ore tolerance
The Encoded Function
Clearance
Ø25±1
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
Ø0.5 M A B S C M
Material Condition Modifier Effects
Tolerance Zone SizeModifiers
M
L
Impact on the Tolerance Zone
M ore tolerance
L ots of tolerance
The Encoded Function
Clearance
Ø25±1
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
Ø0.5 M A B S C M
Material Condition Modifier Effects
Tolerance Zone SizeModifiers
M
L
Impact on the Tolerance Zone
M ore tolerance
L ots of tolerance
The Encoded Function
Clearance
Interference / Overlap
Ø25±1
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
Ø0.5 M A B S C M
Material Condition Modifier Effects
Tolerance Zone SizeModifiers
M ore tolerance
L ots of tolerance
S tuck at 0.5 mm
M
L
S
Impact on the Tolerance Zone The Encoded Function
Clearance
Interference / Overlap
Ø25±1
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
Ø0.5 M A B S C M
Material Condition Modifier Effects
Tolerance Zone SizeModifiers
M ore tolerance
L ots of tolerance
S tuck at 0.5 mm
M
L
S
Impact on the Tolerance Zone The Encoded Function
Clearance
Interference / Overlap
Centering / Aiming
Ø25±1
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
Ø0.5 M A B S C M
Material Condition Modifier Effects
Tolerance Zone SizeModifiers
Impact on Manufacturing
Ø25±1
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
Ø0.5 M A B S C M
Material Condition Modifier Effects
Tolerance Zone SizeModifiers
Encourages pushing features toward their LMC !M
Ø25±1
Impact on Manufacturing
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
Ø0.5 M A B S C M
Material Condition Modifier Effects
Tolerance Zone SizeModifiers
Encourages pushing features toward their LMC !M
L
Ø25±1
Impact on Manufacturing
Encourages pushing features toward their MMC !
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
Ø0.5 M A B S C M
Material Condition Modifier Effects
Tolerance Zone SizeModifiers
M
L
S
Ø25±1
Impact on Manufacturing
Encourages pushing features toward their LMC !
Encourages pushing features toward their MMC !
Encourages keeping features at their mean sizes !
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
Ø0.5 M A B S C M
Material Condition Modifier Effects
Tolerance Zone SizeModifiers
Impact on Coordinate Metrology
Ø25±1
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
Ø0.5 M A B S C M
Material Condition Modifier Effects
Tolerance Zone SizeModifiers
Impact on Coordinate Metrology
Ø25±1
M Requires determining the unconstrained, in-space actual mating size of a feature to expand the Tol Zone
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
Ø0.5 M A B S C M
Material Condition Modifier Effects
Tolerance Zone SizeModifiers
Impact on Coordinate Metrology
Ø25±1
M
L
Requires determining the unconstrained, in-space actual mating size of a feature to expand the Tol Zone
Requires determining the unconstrained, in-material actual mating size of a feature to expand the Tol Zone
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
Ø0.5 M A B S C M
Material Condition Modifier Effects
Tolerance Zone SizeModifiers
Easy to implement, because there is nothing to do !
M
L
S
Impact on Coordinate Metrology
Ø25±1
Requires determining the unconstrained, in-space actual mating size of a feature to expand the Tol Zone
Requires determining the unconstrained, in-material actual mating size of a feature to expand the Tol Zone
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
Tolerance Zone MobilityModifiers
Ø0.5 M A B S C M
Material Condition Modifier Effects
Ø25±1
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
Tolerance Zone MobilityModifiers
Ø0.5 M A B S C M
Material Condition Modifier Effects
Impact on the DRF & Tolerance Zone The Encoded Function
Ø25±1
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
Tolerance Zone MobilityModifiers
Ø0.5 M A B S C M
M
Material Condition Modifier Effects
Impact on the DRF & Tolerance Zone The Encoded Function
Ø25±1
M obilizes the tolerance zone
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
Tolerance Zone MobilityModifiers
Ø0.5 M A B S C M
M
Material Condition Modifier Effects
Impact on the DRF & Tolerance Zone The Encoded Function
{ Mating Part play due to in-space clearance
Ø25±1
M obilizes the tolerance zone
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
Tolerance Zone MobilityModifiers
Ø0.5 M A B S C M
M
Material Condition Modifier Effects
Impact on the DRF & Tolerance Zone The Encoded Function
{
Ø25±1
M obilizes the tolerance zone
This will be demonstrated in the application at the end of the workshop!
Mating Part play due to in-space clearance
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
Tolerance Zone MobilityModifiers
Ø0.5 M A B S C M
M
L
Material Condition Modifier Effects
Impact on the DRF & Tolerance Zone The Encoded Function
{
Ø25±1
M obilizes the tolerance zone
L oosens the tolerance zone
Mating Part play due to in-space clearance
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
Tolerance Zone MobilityModifiers
Ø0.5 M A B S C M
M
L
Material Condition Modifier Effects
Impact on the DRF & Tolerance Zone The Encoded Function
Mating Part play due to in-material overlap
{
{
Ø25±1
M obilizes the tolerance zone
L oosens the tolerance zone
Mating Part play due to in-space clearance
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
Tolerance Zone MobilityModifiers
Ø0.5 M A B S C M
M obilizes the tolerance zone
L oosens the tolerance zone
S tabilizes the tolerance zone
M
L
S
Material Condition Modifier Effects
Impact on the DRF & Tolerance Zone The Encoded Function
{
{
Ø25±1
Mating Part play due to in-space clearance
Mating Part play due to in-material overlap
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
Tolerance Zone MobilityModifiers
Ø0.5 M A B S C M
M
L
S
Material Condition Modifier Effects
Impact on the DRF & Tolerance Zone The Encoded Function
Mating Part centering
{
{
{
Ø25±1
M obilizes the tolerance zone
L oosens the tolerance zone
S tabilizes the tolerance zone
Mating Part play due to in-space clearance
Mating Part play due to in-material overlap
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
Tolerance Zone MobilityModifiers
Ø0.5 M A B S C M
Material Condition Modifier Effects
Impact on the Datum Feature Simulators
Ø25±1
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
Tolerance Zone MobilityModifiers
Ø0.5 M A B S C M
Material Condition Modifier Effects
Impact on the Datum Feature Simulators
Ø25±1
M M Fixes the size of the Simulator at the Virtual Maximum Material Boundary
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
Tolerance Zone MobilityModifiers
Ø0.5 M A B S C M
Material Condition Modifier Effects
Impact on the Datum Feature Simulators
Ø25±1
L
M
L
M Fixes the size of the Simulator at the Virtual Maximum Material Boundary
Fixes the size of the Simulator at the Virtual Least Material Boundary
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
Tolerance Zone MobilityModifiers
Ø0.5 M A B S C M
SS
Material Condition Modifier Effects
Impact on the Datum Feature Simulators
Ø25±1
L
M
L
Fixes the size of the Simulator at the Virtual Maximum Material Boundary
Fixes the size of the Simulator at the Virtual Least Material Boundary
M
Requires the Simulator to expand or contract to consume all the available space
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
Tolerance Zone MobilityModifiers
Ø0.5 M A B S C M
Material Condition Modifier Effects
Impact on Manufacturing
Ø25±1
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
Tolerance Zone MobilityModifiers
Ø0.5 M A B S C M
Material Condition Modifier Effects
Ø25±1
Impact on Manufacturing
Encourages pushing Datum Features toward their LMC. M should always be treated as S for set-upM
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
Tolerance Zone MobilityModifiers
Ø0.5 M A B S C M
Material Condition Modifier Effects
Ø25±1
Impact on Manufacturing
M
L
Encourages pushing Datum Features toward their LMC. M should always be treated as S for set-up
Encourages pushing Datum Features toward their MMC. L should always be treated as S for set-up
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
Tolerance Zone MobilityModifiers
Ø0.5 M A B S C M
Material Condition Modifier Effects
Ø25±1
Impact on Manufacturing
Encourages keeping Datum Features at their mean sizes
M
L
S
Encourages pushing Datum Features toward their LMC. M should always be treated as S for set-up
Encourages pushing Datum Features toward their LMC. L should always be treated as S for set-up
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
Tolerance Zone MobilityModifiers
Ø0.5 M A B S C M
Material Condition Modifier Effects
Impact on Coordinate Metrology
Ø25±1
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
Tolerance Zone MobilityModifiers
Ø0.5 M A B S C M
Material Condition Modifier Effects
M
L
Impact on Coordinate Metrology
Ø25±1
Present significant problems for CMM software and raise the specter of theRule of Simultaneous Requirements !
&
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
Tolerance Zone MobilityModifiers
Ø0.5 M A B S C M
Material Condition Modifier Effects
S
Impact on Coordinate Metrology
Easy to implement, because there is nothing to do !
M
L
Present significant problems for CMM software and raise the specter of theRule of Simultaneous Requirements !
Ø25±1
&
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
Here’s an interesting question !
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
Feature Control Frame Types ?
Compound Composite
What’s the difference between these two
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
Feature Control Frame Types ?
Compound Composite
What’s the difference between these two
It’s huge and very simple:
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
Feature Control Frame Types ?
Compound Composite
What’s the difference between these two
The differences are described on pp. 93–133 in the ASME Y14.5M 1994 Standard . . .
It’s huge and very simple:
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
Feature Control Frame Types ?
Compound Composite
What’s the difference between these two
The differences are described on pp. 93–133 in the ASME Y14.5M 1994 Standard . . .
It’s huge and very simple:
. . . but can be condensed into
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
Composite Feature Control Frames
Compound Composite
The Rule of
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Compound Composite
The Datum Features in the second and all lower tiers of a Composite Feature Control Frame may only constrain rotational degrees of freedom ! (Y14.5M 1994 – pp. 93-133)
Composite Feature Control FramesThe Rule of
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Decoding GD&T
Now we’ll illustrate the process of
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But first let’s do the
“Quick Read”
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Reading the Feature Control Frame.
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Position -
Reading the Feature Control Frame.
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Position - within a diameter of 0.5 mm
Reading the Feature Control Frame.
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Position - within a diameter of 0.5 mm at MMC -
Reading the Feature Control Frame.
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Position - within a diameter of 0.5 mm at MMC - relative to A
Reading the Feature Control Frame.
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Position - within a diameter of 0.5 mm at MMC - relative to A, B
Reading the Feature Control Frame.
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Position - within a diameter of 0.5 mm at MMC - relative to A, B regardless of feature size,
Reading the Feature Control Frame.
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Position - within a diameter of 0.5 mm at MMC - relative to A, B regardless of feature size, and C
Reading the Feature Control Frame.
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Position - within a diameter of 0.5 mm at MMC - relative to A, B regardless of feature size, and C at Maximum Material Condition.
Reading the Feature Control Frame.
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Now, let’s
Decode
it!
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Position requires
Decoding the Feature Control Frame.
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Position requires the bounded axis of the Considered Feature
Decoding the Feature Control Frame.
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
Position requires the bounded axis of the Considered Feature to lie within a cylindrical tolerance zone
Decoding the Feature Control Frame.
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
Position requires the bounded axis of the Considered Feature to lie within a cylindrical tolerance zone of diameter 0.5 mm
Decoding the Feature Control Frame.
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
Position requires the bounded axis of the Considered Feature to lie within a cylindrical tolerance zone of diameter 0.5 mm at MMC -
Decoding the Feature Control Frame.
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
Position requires the bounded axis of the Considered Feature to lie within a cylindrical tolerance zone diameter of 0.5 mm at MMC - expanding by as much as 1 mm
Decoding the Feature Control Frame.
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
Position requires the bounded axis of the Considered Feature to lie within a cylindrical tolerance zone diameter of 0.5 mm at MMC - expanding by as much as 1 mm as the Unconstrained Actual Mating size of the Considered Feature departs from MMC toward LMC -
Decoding the Feature Control Frame.
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
- which is oriented and located by BASIC dimensions -
Decoding the Feature Control Frame.
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
- which is oriented and located by BASIC dimensions - relative to a Datum Reference Frame established using
Decoding the Feature Control Frame.
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
- which is oriented and located by BASIC dimensions - relative to a Datum Reference Frame established using
Y[A,B,C]
Z[A,B,C]
Y[A,B,C]
X[A,B,C]
Decoding the Feature Control Frame.
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
Y[A,B,C]
Z[A,B,C]
Y[A,B,C]
X[A,B,C]
- which is oriented and located by BASIC dimensions - relative to a Datum Reference Frame established using Datum Feature A,
Decoding the Feature Control Frame.
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
- which is oriented and located by BASIC dimensions - relative to a Datum Reference
Frame established using Datum Feature A, simulated rocking,
Y[A,B,C]
Z[A,B,C]
Y[A,B,C]
X[A,B,C]
Decoding the Feature Control Frame.
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
Y[A,B,C]
Z[A,B,C]
Y[A,B,C]
X[A,B,C]
- which is oriented and located by BASIC dimensions - relative to a Datum Reference Frame established using Datum Feature A, simulated rocking, Datum Feature B,
Decoding the Feature Control Frame.
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
- which is oriented and located by BASIC dimensions - relative to a Datum Reference Frame established using Datum Feature A, simulated rocking, Datum Feature B,
simulated stably, regardless of its size,
Y[A,B,C]
Z[A,B,C]
Y[A,B,C]
X[A,B,C]
Decoding the Feature Control Frame.
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
Y[A,B,C]
Z[A,B,C]
Y[A,B,C]
X[A,B,C]
- which is oriented and located by BASIC dimensions - relative to a Datum Reference Frame established using Datum Feature A, simulated rocking, Datum Feature B, simulated stably regardless of its size, and Datum Feature C,
Decoding the Feature Control Frame.
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
- which is oriented and located by BASIC dimensions - relative to a Datum Reference Frame established using Datum Feature A, simulated rocking, Datum Feature B,
simulated stably, regardless of its size, and Datum Feature C, simulated mobly at its Virtual Maximum Material Condition size.
Y[A,B,C]
Z[A,B,C]
Y[A,B,C]
X[A,B,C]
Decoding the Feature Control Frame.
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Got it?One more time !
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Position requires
Decoding the Feature Control Frame.
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Position requires the bounded axis of the Considered Feature
Decoding the Feature Control Frame.
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
Position requires the bounded axis of the Considered Feature to lie within a cylindrical tolerance zone
Decoding the Feature Control Frame.
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
Position requires the bounded axis of the Considered Feature to lie within a cylindrical tolerance zone of diameter 0.5 mm
Decoding the Feature Control Frame.
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
Position requires the bounded axis of the Considered Feature to lie within a cylindrical tolerance zone of diameter 0.5 mm at MMC -
Decoding the Feature Control Frame.
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
Position requires the bounded axis of the Considered Feature to lie within a cylindrical tolerance zone diameter of 0.5 mm at MMC - expanding by as much as 1 mm
Decoding the Feature Control Frame.
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
Position requires the bounded axis of the Considered Feature to lie within a cylindrical tolerance zone diameter of 0.5 mm at MMC - expanding by as much as 1 mm as the Unconstrained Actual Mating size of the Considered Feature departs from MMC toward LMC -
Decoding the Feature Control Frame.
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
- which is oriented and located by BASIC dimensions -
Decoding the Feature Control Frame.
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
- which is oriented and located by BASIC dimensions - relative to a Datum Reference Frame established using
Decoding the Feature Control Frame.
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
- which is oriented and located by BASIC dimensions - relative to a Datum Reference Frame established using
Y[A,B,C]
Z[A,B,C]
Y[A,B,C]
X[A,B,C]
Decoding the Feature Control Frame.
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
Y[A,B,C]
Z[A,B,C]
Y[A,B,C]
X[A,B,C]
- which is oriented and located by BASIC dimensions - relative to a Datum Reference Frame established using Datum Feature A,
Decoding the Feature Control Frame.
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
- which is oriented and located by BASIC dimensions - relative to a Datum Reference
Frame established using Datum Feature A, simulated rocking,
Y[A,B,C]
Z[A,B,C]
Y[A,B,C]
X[A,B,C]
Decoding the Feature Control Frame.
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
Y[A,B,C]
Z[A,B,C]
Y[A,B,C]
X[A,B,C]
- which is oriented and located by BASIC dimensions - relative to a Datum Reference Frame established using Datum Feature A, simulated rocking, Datum Feature B,
Decoding the Feature Control Frame.
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
- which is oriented and located by BASIC dimensions - relative to a Datum Reference Frame established using Datum Feature A, simulated rocking, Datum Feature B,
simulated stably, regardless of its size,
Y[A,B,C]
Z[A,B,C]
Y[A,B,C]
X[A,B,C]
Decoding the Feature Control Frame.
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
Y[A,B,C]
Z[A,B,C]
Y[A,B,C]
X[A,B,C]
- which is oriented and located by BASIC dimensions - relative to a Datum Reference Frame established using Datum Feature A, simulated rocking, Datum Feature B, simulated stably regardless of its size, and Datum Feature C,
Decoding the Feature Control Frame.
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
- which is oriented and located by BASIC dimensions - relative to a Datum Reference Frame established using Datum Feature A, simulated rocking, Datum Feature B,
simulated stably, regardless of its size, and Datum Feature C, simulated mobly at its Virtual Maximum Material Condition size.
Y[A,B,C]
Z[A,B,C]
Y[A,B,C]
X[A,B,C]
Decoding the Feature Control Frame.
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
With decoding in hand, we’re ready to investigate the
Datum Reference FrameEstablishment Process
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We’ll use the indicated Datum Features . . .
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
We’ll use the indicated Datum Features . . .
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
We’ll use the indicated Datum Features and their Tolerance Zone Mobility Modifiers
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
We’ll use the indicated Datum Features and their Tolerance Zone Mobility Modifiers
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
We’ll use the indicated Datum Features and their Tolerance Zone Mobility Modifiers to establish the specified Datum reference Frame !
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
We’ll use the indicated Datum Features and their Tolerance Zone Mobility Modifiers to establish the specified Datum reference Frame !
Y[A,B,C]
Z[A,B,C]
Y[A,B,C]
X[A,B,C]
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
We’ll use the indicated Datum Features and their Tolerance Zone Mobility Modifiers to establish the specified Datum reference Frame !
Y[A,B,C]
Z[A,B,C]
Y[A,B,C]
X[A,B,C]
And discover how the modifier M leads to
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
We’ll use the indicated Datum Features and their Tolerance Zone Mobility Modifiers to establish the specified Datum reference Frame !
Y[A,B,C]
Z[A,B,C]
Y[A,B,C]
X[A,B,C]
And discover how the modifier M leads to
Tolerance Zone Mobility
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
Concepts
Foundations for establishing a Datum Reference Frame
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
1. Datum Features
2. Datum Targets
3. Datum Feature Simulators
4. Datums
Concepts
Foundations for establishing a Datum Reference Frame
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
Concepts
Tools
Foundations for establishing a Datum Reference Frame
1. Datum Features
2. Datum Targets
3. Datum Feature Simulators
4. Datums
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
Concepts
1. Datum Feature Labels
2. Tolerance Zone Mobility Modifiers
3. Feature Control FramesTools
Foundations for establishing a Datum Reference Frame
1. Datum Features
2. Datum Targets
3. Datum Feature Simulators
4. Datums
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
Concepts
1. Datum Feature Labels
2. Tolerance Zone Mobility Modifiers
3. Feature Control FramesTools
Foundations for establishing a Datum Reference Frame
Rules
1. Datum Features
2. Datum Targets
3. Datum Feature Simulators
4. Datums
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
Concepts
1. Datum Feature Labels
2. Tolerance Zone Mobility Modifiers
3. Feature Control FramesTools
Foundations for establishing a Datum Reference Frame
Rules 1. Rules of Datum Feature Simulator Management
2. Rules of Natural Datum Reference Frame Establishment
1. Datum Features
2. Datum Targets
3. Datum Feature Simulators
4. Datums
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
Concepts
1. Datum Feature Labels
2. Tolerance Zone Mobility Modifiers
3. Feature Control FramesTools
Rules 1. Rules of Datum Feature Simulator Management
2. Rules of Natural Datum Reference Frame Establishment
Foundations for establishing a Datum Reference Frame
Details1. Datum Features
2. Datum Targets
3. Datum Feature Simulators
4. Datums
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
Datum FeaturesDefinition:
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
Datum FeaturesDefinition:
Datum Features are specially labeled, imperfect, physical surfaces of real parts, which serve to constrain degrees of rotational and translational freedom during assembly processes.
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
40
25 18
CB
A
Datum FeaturesDefinition:
Datum Features are specially labeled, imperfect, physical surfaces of real parts, which serve to constrain degrees of rotational and translational freedom during assembly processes.
A is a Planar Surface
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
40
25 18
CB
A
Datum FeaturesDefinition:
Datum Features are specially labeled, imperfect, physical surfaces of real parts, which serve to constrain degrees of rotational and translational freedom during assembly processes.
A is a Planar Surface
B is a Bore
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
40
25 18
CB
A
Datum Features
A is a Planar Surface
B is a Bore
C is a Slot
Definition:
Datum Features are specially labeled, imperfect, physical surfaces of real parts, which serve to constrain degrees of rotational and translational freedom during assembly processes.
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
Datum Targets
Definition:
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
Datum Targets
Definition:
Datum Targets are limited portions of Datum Features:
which encode the fact that the mating Datum Feature, assembly or manufacturing fixture, will only engage the indicated, limited portions of the Datum Feature under consideration.
• Points• Lines• Limited Areas
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
Datum Targets
SØ10A2
40
SØ10
A3
A
40
500
SØ10SØ10
SØ10SØ10
A1
0
50
A1
A2
A2
A2
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
Datum Targets
Point Datum Targets A1, A2 and A3 are to be simulated by spherical simulators of dia. 10mm
SØ10A2
40
SØ10
A3
A
40
500
SØ10SØ10
SØ10SØ10
A1
0
50
A1
A2
A2
A2
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
Datum Feature Simulators
Definition:
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
Datum Feature Simulators
Definition:
Datum Feature Simulators are conceptually perfect, or physically almost perfect, inverse Datum Features,
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
Datum Feature Simulators
1. from which we extract Datums
Definition:
Datum Feature Simulators are conceptually perfect, or physically almost perfect, inverse Datum Features,
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
Datum Feature Simulators
1. from which we extract Datums
2. in which we establish Datum Reference Frames, and
Definition:
Datum Feature Simulators are conceptually perfect, or physically almost perfect, inverse Datum Features,
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
Datum Feature Simulators
1. from which we extract Datums
2. in which we establish Datum Reference Frames, and
3. with which we transfer Datum Reference Frames to actual parts.
Definition:
Datum Feature Simulators are conceptually perfect, or physically almost perfect, inverse Datum Features,
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
Datum Feature Simulators
1. from which we extract Datums
2. in which we establish Datum Reference Frames, and
3. with which we transfer Datum Reference Frames to actual parts.
Definition:
Datum Feature Simulators are conceptually perfect, or physically almost perfect, inverse Datum Features,
The machining fixtures and gages used in manufacturing and inspection processes are examples
of physical Datum Feature Simulators.
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
Datum Feature Simulators
1. from which we extract Datums
2. in which we establish Datum Reference Frames, and
3. with which we transfer Datum Reference Frames to actual parts.
Definition:
Datum Feature Simulators are conceptually perfect, or physically almost perfect, inverse Datum Features,
Mathematical Datum Feature Simulators are constructed by Coordinate Measuring Machine
software systems during Datum Reference Frame establishment procedures.
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
Datum Feature Simulator Details
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
40
25 18
CB
A
Datum Feature A: a Planar Surface
Datum Feature Simulator Details
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
40
25 18
CB
A
18
16
Datum Feature Simulator A:an inverse Planar Surface
Datum Feature A: a Planar Surface
Datum Feature Simulator Details
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
Datum Target Simulator Details
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
SØ10A2
40
SØ10
A3
A
40
500
SØ10SØ10
SØ10SØ10
A1
0
50
A1
A2
A2
A2
Point Datum Targets A1, A2 and A3
Datum Target Simulator Details
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
SØ10A2
40
SØ10
A3
A
40
500
SØ10SØ10
SØ10SØ10
A1
0
50
A1
A2
A2
A2
16
18
Datum Target Simulators A1, A2 and A3:Three Tooling Balls
Point Datum Targets A1, A2 and A3
Datum Target Simulator Details
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
40
25 18
CB
A
Datum Feature B: a Bore
Datum Feature Simulator Details
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
40
25 18
CB
A
18
16
Datum Feature Simulator B:an expanding Cylinder
Datum Feature B: a Bore
S
Datum Feature Simulator Details
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
40
25 18
CB
A
Datum Feature C: a Slot
Datum Feature Simulator Details
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
40
25 18
CB
A
18
16
Datum Feature Simulator Details
Datum Feature Simulator C:A fixed “Tombstone”
Datum Feature C: a Slot
M
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
Datums
Definition:
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
Datums
Definition:
Datums are the minimum set of one perfect imaginary reference point, and/or straight line, and/or plane, which together, fully characterize the orientation and location of a datum feature simulator.
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
Pointon-Line
Line
Point
Linein-Plane
Pointon-Linein-Plane
Degrees of Constraint Capability
Pitch Yaw Roll Translation
Plane
Note 1.
Planar Surface Slab
Compound Curved Surface
Wedge Cyl. Pattern
Cone Torus
Sphere
Cylinder
Datum Feature Simulator DFS + Datum Datum Datum Type Rx Ry Rz Tx Ty Tz
Datum Feature Simulators & Datums
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
Datum Details
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
40
25 18
CB
A
Datum Details
Datum Feature A: a Planar Surface
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
Datum A: the tangent plane onDatum Feature Simulator A
40
25 18
CB
A
Datum Details
Datum Feature A: a Planar Surface
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
Datum Details for Datum Targets
SØ10A2
40
SØ10
A3
A
40
500
SØ10SØ10
SØ10SØ10
A1
0
50
A1
A2
A2
A2Datum Targets A1, A2 and A3:
Points
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
Datum A: the tangent plane onDatum Target Simulators A1, A2 and A3
SØ10A2
40
SØ10
A3
A
40
500
SØ10SØ10
SØ10SØ10
A1
0
50
A1
A2
A2
A2Datum Targets A1, A2 and A3:
Points
Datum Details for Datum Targets
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
Datum Details
40
25 18
CB
ADatum Feature B: a Bore
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
Datum B: the axis ofDatum Feature Simulator B
Datum Details
40
25 18
CB
ADatum Feature B: a Bore
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
Datum Details
40
25 18
CB
A
Datum Feature C: a Slot
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
Datum C: the mid-plane ofDatum Feature Simulator C
Datum Details
40
25 18
CB
A
Datum Feature C: a Slot
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
Concepts
1. Datum Feature Labels
2. Tolerance Zone Mobility Modifiers
3. Feature Control FramesTools
Rules 1. Rules of Datum Feature Simulator Management
2. Rules of Natural Datum Reference Frame Establishment
Foundations for establishing a Datum Reference Frame
Details
1. Datum Features
2. Datum Targets
3. Datum Feature Simulators
4. Datums
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
Rules of Datum Feature Simulator Management
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
Rules of Datum Feature Simulator Management
1. Form: All simulators shall have perfect form.
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
Rules of Datum Feature Simulator Management
1. Form: All simulators shall have perfect form.
2. Orientation: All simulators shall be perfectly oriented by their associated basic angular dimensions.
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
Rules of Datum Feature Simulator Management
1. Form: All simulators shall have perfect form.
2. Orientation: All simulators shall be perfectly oriented by their associated basic angular dimensions.
3. Location: Unless otherwise indicated, all simulators shall be perfectly located by their associated basic linear dimensions.
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
Rules of Datum Feature Simulator Management
1. Form: All simulators shall have perfect form.
2. Orientation: All simulators shall be perfectly oriented by their associated basic angular dimensions.
3. Location: Unless otherwise indicated, all simulators shall be perfectly located by their associated basic linear dimensions.
4. Size: - Simulators referenced RFS shall expand or contract to consume all the space available in or outside their associated Datum Features. - Simulators referenced at MMC or LMC shall be fixed at the Virtual MMC or LMC size of their associated Datum Features.
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
Rules of Natural Datum Reference Frame Establishment
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
1. Rule of Datum Feature Precedence: Datum Features shall be used in the order in which they appear in the Feature Control Frame, reading from left to right.
Rules of Natural Datum Reference Frame Establishment
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
1. Rule of Datum Feature Precedence: Datum Features shall be used in the order in which they appear in the Feature Control Frame, reading from left to right.
2. Rule of Degrees of Constraint Precedence: Each Datum Feature shall first attempt to constrain pitch & yaw, then only roll, and only then translational degrees of freedom.
Rules of Natural Datum Reference Frame Establishment
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
1. Rule of Datum Feature Precedence: Datum Features shall be used in the order in which they appear in the Feature Control Frame, reading from left to right.
2. Rule of Degrees of Constraint Precedence: Each Datum Feature shall first attempt to constrain pitch & yaw, then only roll, and only then translational degrees of freedom.
3. Rule of Non-Override: No Datum Feature may impact degrees of freedom constrained by higher precedence Datum Features.
Rules of Natural Datum Reference Frame Establishment
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
1. Rule of Datum Feature Precedence: Datum Features shall be used in the order in which they appear in the Feature Control Frame, reading from left to right.
2. Rule of Degrees of Constraint Precedence: Each Datum Feature shall first attempt to constrain pitch & yaw, then only roll, and only then translational degrees of freedom.
3. Rule of Non-Override: No Datum Feature may impact degrees of freedom constrained by higher precedence Datum Features.
4. Can-May-Must Rule: - If a Datum Feature can constrain a degree of freedom, and also may, then it must.
Rules of Natural Datum Reference Frame Establishment
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
The Six StepDatum Reference FrameEstablishment Process
Now for . . .
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
Datum Reference FrameEstablishment Process Steps
1. Decode the Feature Control Frame
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
1. Decode the Feature Control Frame
2. Identify the Datum Features
Datum Reference FrameEstablishment Process Steps
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
1. Decode the Feature Control Frame
2. Identify the Datum Features
3. Construct the Datum Feature Simulators
Datum Reference FrameEstablishment Process Steps
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
1. Decode the Feature Control Frame
2. Identify the Datum Features
3. Construct the Datum Feature Simulators
4. Extract the Datums from their Simulators
Datum Reference FrameEstablishment Process Steps
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
1. Decode the Feature Control Frame
2. Identify the Datum Features
3. Construct the Datum Feature Simulators
4. Extract the Datums from their Simulators
5. Use the Datums to establish the DRF in the simulators by constraining the rotational and translational degrees of freedom of a starter coordinate system
Datum Reference FrameEstablishment Process Steps
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
1. Decode the Feature Control Frame
2. Identify the Datum Features
3. Construct the Datum Feature Simulators
4. Extract the Datums from their Simulators
5. Use the Datums to establish the DRF in the simulators by constraining the rotational and translational degrees of freedom of a starter coordinate system
6. Marry the Datum Features to their simulators to transfer the Datum Reference Frame to the actual part.
Datum Reference FrameEstablishment Process Steps
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
The Six Step Datum Reference Frame Establishment Process
Z(1)
Y(1)
C
X(1)25
Y(1)
40
A
B
18
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
Z(1)
Y(1)
C
X(1)25
Y(1)
40
A
B
18
Step 1.
Decode the Feature Control Frame
The Six Step Datum Reference Frame Establishment Process
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
The Six Step Datum Reference Frame Establishment Process
What ? One more time ?
No !
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
Z(1)
Y(1)
C
X(1)25
Y(1)
40
A
B
18
The Six Step Datum Reference Frame Establishment Process
Step 2.
Identify the Datum Features
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
Z(1)
Y(1)
C
X(1)25
Y(1)
40
A
B
18
The Six Step Datum Reference Frame Establishment Process
Step 2.
Identify the Datum Features
Feature A: a planar surface
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
Z(1)
Y(1)
C
X(1)25
Y(1)
40
A
B
18
The Six Step Datum Reference Frame Establishment Process
Step 2.
Identify the Datum Features
Feature A: a planar surfaceFeature B: a hollow cylinder
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
Z(1)
Y(1)
C
X(1)25
Y(1)
40
A
B
18
The Six Step Datum Reference Frame Establishment Process
Feature A: a planar surfaceFeature B: a hollow cylinderFeature C: a slot
Step 2.
Identify the Datum Features
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
The Six Step Datum Reference Frame Establishment Process
Step 3.
Construct the Datum Feature Simulators
A
25
Z[A,B,C]
B
40
Y[A,B,C] Y[A,B,C]
C
X[A,B,C]
18
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
The Six Step Datum Reference Frame Establishment Process
Step 3.
Construct the Datum Feature Simulators
A
25
Z[A,B,C]
B
40
Y[A,B,C] Y[A,B,C]
C
X[A,B,C]
18
18
16
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
The Six Step Datum Reference Frame Establishment Process
Step 3.
Construct the Datum Feature Simulators
A
A
25
Z[A,B,C]
B
40
Y[A,B,C] Y[A,B,C]
C
X[A,B,C]
18
18
16
Simulator A: a planar surface
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
The Six Step Datum Reference Frame Establishment Process
Step 3.
Construct the Datum Feature Simulators
B
A
25
Z[A,B,C]
B
40
Y[A,B,C] Y[A,B,C]
C
X[A,B,C]
18
18
16
Simulator A: a planar surfaceSimulator B: an expanding solid cylinder
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
The Six Step Datum Reference Frame Establishment Process
Step 3.
Construct the Datum Feature Simulators
Simulator A: a planar surfaceSimulator B: an expanding solid cylinderSimulator C: a slab fixed in size at
the Virtual Maximum Material Boundary of the slot
C
A
25
Z[A,B,C]
B
40
Y[A,B,C] Y[A,B,C]
C
X[A,B,C]
18
18
16
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
The Six Step Datum Reference Frame Establishment Process
Step 4.
Extract the Datums from their Simulators
A
25
Z[A,B,C]
B
40
Y[A,B,C] Y[A,B,C]
C
X[A,B,C]
18
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
The Six Step Datum Reference Frame Establishment Process
Step 4.
Extract the Datums from their Simulators
Datum A: the tangent plane on Simulator A
A
A
25
Z[A,B,C]
B
40
Y[A,B,C] Y[A,B,C]
C
X[A,B,C]
18
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
The Six Step Datum Reference Frame Establishment Process
Step 4.
Extract the Datums from their Simulators
Datum A: the tangent plane on Simulator ADatum B: the axis of Simulator B
B
A
25
Z[A,B,C]
B
40
Y[A,B,C] Y[A,B,C]
C
X[A,B,C]
18
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
The Six Step Datum Reference Frame Establishment Process
Step 4.
Extract the Datums from their Simulators
Datum A: the tangent plane on Simulator ADatum B: the axis of Simulator BDatum C: the mid-plane of Simulator C
C
A
25
Z[A,B,C]
B
40
Y[A,B,C] Y[A,B,C]
C
X[A,B,C]
18
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
The Six Step Datum Reference Frame Establishment Process
Step 5.
Use the Datums to establish the DRF in the Simulators by constraining a
“starter” coordinate system.
A
25
Z[A,B,C]
B
40
Y[A,B,C] Y[A,B,C]
C
X[A,B,C]
18
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
The Six Step Datum Reference Frame Establishment Process
Step 5.
Use the Datums to establish the DRF in the Simulators by constraining a “starter”
coordinate system.
A
25
Z[A,B,C]
B
40
Y[A,B,C] Y[A,B,C]
C
X[A,B,C]
18
Datum Set
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
The Six Step Datum Reference Frame Establishment Process
Step 5.
Use the Datums to establish the DRF in the Simulators by constraining a “starter”
coordinate system.
“Starter” Coordinate System
Y
X
Z
A
25
Z[A,B,C]
B
40
Y[A,B,C] Y[A,B,C]
C
X[A,B,C]
18
Datum Set
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
The Six Step Datum Reference Frame Establishment Process
Step 5.
Use the Datums to establish the DRF in the Simulators by constraining a “starter”
coordinate system.
Datum A constrains Rx & Ry (pitch & yaw) plus Tz
Y
X
Z
A
25
Z[A,B,C]
B
40
Y[A,B,C] Y[A,B,C]
C
X[A,B,C]
18
A
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
The Six Step Datum Reference Frame Establishment Process
Step 5.
Use the Datums to establish the DRF in the Simulators by constraining a “starter”
coordinate system.
Datum A constrains Rx & Ry (pitch & yaw) plus Tz
Y
X
Z A
Z[A]
X[A]
Y[A]
A
25
Z[A,B,C]
B
40
Y[A,B,C] Y[A,B,C]
C
X[A,B,C]
18
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
The Six Step Datum Reference Frame Establishment Process
Step 5.
Use the Datums to establish the DRF in the Simulators by constraining a “starter”
coordinate system.
Datum A constrains Rx & Ry (pitch & yaw) plus TzDatum B constrains Tx and Ty
X
Y
Z
B
A
25
Z[A,B,C]
B
40
Y[A,B,C] Y[A,B,C]
C
X[A,B,C]
18
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
The Six Step Datum Reference Frame Establishment Process
Step 5.
Use the Datums to establish the DRF in the Simulators by constraining a “starter”
coordinate system.
Datum A constrains Rx & Ry (pitch & yaw) plus TzDatum B constrains Tx and Ty
X
Y
Z
B
X[A,B]
Y[A,B]
Z[A,B]
A
25
Z[A,B,C]
B
40
Y[A,B,C] Y[A,B,C]
C
X[A,B,C]
18
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
The Six Step Datum Reference Frame Establishment Process
Step 5.
Use the Datums to establish the DRF in the Simulators by constraining a “starter”
coordinate system.
Datum A constrains Rx & Ry (pitch & yaw) plus TzDatum B constrains Tx and TyDatum C constrains Rz (roll)
C
X[A,B]
Y[A,B]
Z[A,B]
A
25
Z[A,B,C]
B
40
Y[A,B,C] Y[A,B,C]
C
X[A,B,C]
18
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
The Six Step Datum Reference Frame Establishment Process
Step 5.
Use the Datums to establish the DRF in the Simulators by constraining a “starter”
coordinate system.
Y[A,B,C]X[A,B,C]
Z[A,B,C]
C
A
25
Z[A,B,C]
B
40
Y[A,B,C] Y[A,B,C]
C
X[A,B,C]
18
Datum A constrains Rx & Ry (pitch & yaw) plus TzDatum B constrains Tx and TyDatum C constrains Rz (roll)
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
The Six Step Datum Reference Frame Establishment Process
Step 6.
Marry the Datum Features to their simulators to transfer the DRF to the
actual part.
Y[A,B,C]Y[A,B,C]
40
18
X[A,B,C]
CB
Z[A,B,C]
25
A
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
The Six Step Datum Reference Frame Establishment ProcessY[A,B,C]Y[A,B,C]
40
18
X[A,B,C]
CB
Z[A,B,C]
25
A
Step 6.
Marry the Datum Features to their simulators to transfer the DRF to the
actual part.
X[A,B,C]
Z[A,B,C]
Y[A,B,C]
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
The Six Step Datum Reference Frame Establishment Process
may rock relative toDatum Feature A.
DRF [A,B,C] . . .
Y[A,B,C]Y[A,B,C]
40
18
X[A,B,C]
CB
Z[A,B,C]
25
A
Step 6.
Marry the Datum Features to their simulators to transfer the DRF to the
actual part.
X[A,B,C]
Z[A,B,C]
Y[A,B,C]
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
The Six Step Datum Reference Frame Establishment Process
may rock relative toDatum Feature A.
DRF [A,B,C] . . .
Y[A,B,C]Y[A,B,C]
40
18
X[A,B,C]
CB
Z[A,B,C]
25
A
Step 6.
Marry the Datum Features to their simulators to transfer the DRF to the
actual part.
X[A,B,C]
Z[A,B,C]
Y[A,B,C]
Unless Datum Feature A isrepresented by Datum Targets . . .
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
The Six Step Datum Reference Frame Establishment Process
may rock relative toDatum Feature A.
DRF [A,B,C] . . .
Y[A,B,C]Y[A,B,C]
40
18
X[A,B,C]
CB
Z[A,B,C]
25
A
Step 6.
Marry the Datum Features to their simulators to transfer the DRF to the
actual part.
X[A,B,C]
Z[A,B,C]
Y[A,B,C]
Unless Datum Feature A isrepresented by Datum Targets . . .. . . in which case DRF [A,B,C] will be stable relative to Datum Feature A !
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
The Six Step Datum Reference Frame Establishment Process
will rock relative toDatum Feature A.
will be stable relative to Datum Feature B.
Y[A,B,C]Y[A,B,C]
40
18
X[A,B,C]
CB
Z[A,B,C]
25
A
Step 6.
Marry the Datum Features to their simulators to transfer the DRF to the
actual part.
DRF [A,B,C] . . .
X[A,B,C]
Z[A,B,C]
Y[A,B,C]
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
The Six Step Datum Reference Frame Establishment Process
will rock relative toDatum Feature A.
will be stable relative to Datum Feature B.
will be partially roll mobile relative to Datum Feature C
Y[A,B,C]Y[A,B,C]
40
18
X[A,B,C]
CB
Z[A,B,C]
25
A
Step 6.
Marry the Datum Features to their simulators to transfer the DRF to the
actual part.
DRF [A,B,C] . . .
X[A,B,C]
Z[A,B,C]
Y[A,B,C]
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
The Six Step Datum Reference Frame Establishment ProcessY[A,B,C]Y[A,B,C]
40
18
X[A,B,C]
CB
Z[A,B,C]
25
A
Why?
DRF [A,B,C] . . .
will rock relative to Datum Feature A.
will be stable relative to Datum Feature B.
will be partially roll mobile relative to Datum Feature C
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
The Six Step Datum Reference Frame Establishment ProcessY[A,B,C]Y[A,B,C]
40
18
X[A,B,C]
CB
Z[A,B,C]
25
A
Simulator C does not consume all the space inside Datum Feature C !
Because . . .
DRF [A,B,C] . . .
will rock relative to Datum Feature A.
will be stable relative to Datum Feature B.
will be partially roll mobile relative to Datum Feature C
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
The Six Step Datum Reference Frame Establishment ProcessY[A,B,C]Y[A,B,C]
40
18
X[A,B,C]
CB
Z[A,B,C]
25
A
Simulator C does not consume all the space inside Datum Feature C !
Because . . .
DRF [A,B,C] . . .
will rock relative to Datum Feature A.
will be stable relative to Datum Feature B.
will be partially roll mobile relative to Datum Feature C
Y[A,B,C]
25
40
X[A,B,C]
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
The Six Step Datum Reference Frame Establishment ProcessY[A,B,C]Y[A,B,C]
40
18
X[A,B,C]
CB
Z[A,B,C]
25
A
DRF [A,B,C] . . .
will rock relative to Datum Feature A.
will be stable relative to Datum Feature B.
will be partially roll mobile relative to Datum Feature C
Y[A,B,C]
25
40
X[A,B,C]
And . . .
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The Six Step Datum Reference Frame Establishment ProcessY[A,B,C]Y[A,B,C]
40
18
X[A,B,C]
CB
Z[A,B,C]
25
A
DRF [A,B,C] . . .
will rock relative to Datum Feature A.
will be stable relative to Datum Feature B.
will be partially roll mobile relative to Datum Feature C
Y[A,B,C]
25
40
X[A,B,C]
And . . .although the Considered Feature seems to be out of tolerance . . .
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
The Six Step Datum Reference Frame Establishment ProcessY[A,B,C]Y[A,B,C]
40
18
X[A,B,C]
CB
Z[A,B,C]
25
A
Y[A,B,C]
25
40
X[A,B,C]
DRF [A,B,C] . . .
will rock relative to Datum Feature A.
will be stable relative to Datum Feature B.
will be partially roll mobile relative to Datum Feature C
And . . .although the Considered Feature seems to be out of tolerance . . .
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
The Six Step Datum Reference Frame Establishment ProcessY[A,B,C]Y[A,B,C]
40
18
X[A,B,C]
CB
Z[A,B,C]
25
A
DRF [A,B,C] . . .
will rock relative to Datum Feature A.
will be stable relative to Datum Feature B.
will be partially roll mobile relative to Datum Feature C
And . . .although the Considered Feature seems to be out of tolerance . . . if we roll the DRF, which also rolls the tolerance zone, . . .
Y[A,B,C]
25
40
X[A,B,C]
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
The Six Step Datum Reference Frame Establishment ProcessY[A,B,C]Y[A,B,C]
40
18
X[A,B,C]
CB
Z[A,B,C]
25
A
Y[A,B,C]
25
40
X[A,B,C]
DRF [A,B,C] . . .
will rock relative to Datum Feature A.
will be stable relative to Datum Feature B.
will be partially roll mobile relative to Datum Feature C
And . . .although the Considered Feature seems to be out of tolerance . . . if we roll the DRF, which also rolls the tolerance zone, . . .
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
The Six Step Datum Reference Frame Establishment ProcessY[A,B,C]Y[A,B,C]
40
18
X[A,B,C]
CB
Z[A,B,C]
25
A
DRF [A,B,C] . . .
will rock relative to Datum Feature A.
will be stable relative to Datum Feature B.
will be partially roll mobile relative to Datum Feature C
And . . .although the Considered Feature seems to be out of tolerance . . . if we roll the DRF, which also rolls the tolerance zone, . . .
Y[A,B,C]
25
40
X[A,B,C]
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
The Six Step Datum Reference Frame Establishment ProcessY[A,B,C]Y[A,B,C]
40
18
X[A,B,C]
CB
Z[A,B,C]
25
A
And . . .although the Considered Feature seems to be out of tolerance . . . if we roll the DRF, which also rolls the tolerance zone, . . .
DRF [A,B,C] . . .
will rock relative to Datum Feature A.
will be stable relative to Datum Feature B.
will be partially roll mobile relative to Datum Feature C
Y[A,B,C]
25
40
X[A,B,C]
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
The Six Step Datum Reference Frame Establishment ProcessY[A,B,C]Y[A,B,C]
40
18
X[A,B,C]
CB
Z[A,B,C]
25
A
And . . .although the Considered Feature seems to be out of tolerance . . . if we roll the DRF, which also rolls the tolerance zone, . . . the Considered Feature comes into tolerance !
DRF [A,B,C] . . .
will rock relative to Datum Feature A.
will be stable relative to Datum Feature B.
will be partially roll mobile relative to Datum Feature C
Y[A,B,C]
25
40
X[A,B,C]
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
This is exactly what a functional gage would do, and therefore exactly what CMM software does – i.e. should do –
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
This is exactly what a functional gage would do, and therefore exactly what CMM software does -
at least on sunny days !
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
And in really sophisticated systems, the whole process is automated !
This is exactly what a functional gage would do, and therefore exactly what CMM software does -
at least on sunny days !
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
Concluding Remarks
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
Concluding Remarks
We have come here to demonstrate that GD&T can and must only be
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
Concluding Remarks
We have come here to demonstrate that GD&T can and must only be
“encoded” and “decoded”
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
and that many GD&T processes can and should be
Concluding Remarks
We have come here to demonstrate that GD&T can and must only be
“encoded” and “decoded”
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
We have come here to demonstrate that GD&T can and must only be
“encoded” and “decoded”
and that many GD&T processes can and should be
Automated !
Concluding Remarks
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
SmartGD&T Solutions:
And so it’s time for
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
What isSmartGD&T ?
SmartGD&T is a rule-based, process driven approach to either the ASME Y14.5M 1994 or ISO 1101 standard, which makes it possible to “encode” and “decode”, rather than “interpret” GD&T, and get it right the first time.
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
SmartGD&T Solutions:
1. Systematize the language with precisely defined
ConceptsToolsRulesProcesses
2. Automate GD&T related design, manufacturing and inspection processes
3. Provide on-demand, web based support.
4. Build internal, live support teams.
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
Founded in 1975, Multi Metrics currently provides the following
Services
Products
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
Founded in 1975, Multi Metrics currently provides the following
Services
• SmartGD&T Pseudo-Code
Products
Detailed Guidelines for automating GD&T processes in CAD, CAM and CAI software
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
Founded in 1975, Multi Metrics currently provides the following
Services
• SmartGD&T Pseudo-Code• e-GAD – on-line electronic GD&T Aided Design• Training Manuals & Presentation Materials• Training Models• Reference Books
Products
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
Founded in 1975, Multi Metrics currently provides the following
• SmartGD&T Technology Licensing
Services
• SmartGD&T Pseudo-Code• e-GAD – on-line electronic GD&T Aided Design• Training Manuals & Presentation Materials• Training Models• Reference Books
Products
Patents and Support for automating GD&T processes in CAD, CAM and CAI software
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
Founded in 1975, Multi Metrics currently provides the following
• SmartGD&T Technology Licensing
• Corporate GD&T Implementation Planning
• On-Site GD&T End–user and Trainer Training
• On-Site GD&T Encoding & Decoding Services
Services
• SmartGD&T Pseudo-Code• e-GAD – on-line electronic GD&T Aided Design• Training Manuals & Presentation Materials• Training Models• Reference Books
Products
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
Solution Details
SmartGD&T TM
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
clarify and systematize the language!
SmartGD&T Solution #1
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
• Crystalline Definitions !
• Explicit, easily found Rules !
• Smooth Processes
is all about
SmartGD&T TM
Technology
clarify and systematize the language!
SmartGD&T Solution #1
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
SmartGD&T Solution #2
Provide web based electronic support!
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
e-GADelectronic GD&T Aided Design
TM
Provide web based electronic support!
SmartGD&T Solution #2
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
e-GADelectronic GD&T Aided Design
TM
1. The “SmartGD&T Best Practices Guide”
2. The “SmartGD&T On-Line Tutor”
Provide web based electronic support!
SmartGD&T Solution #2
Consists of:
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
The SmartGD&T
Best Practices Guide
SmartGD&T Solution #2
A searchable,Encyclopedia of GD&T
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
SmartGD&T Best Practices Guide
TheHome Page
For clarity, we break GD&T down into the four groups:
1. Concepts
Users click on any item in the top or bottom bars to access the desired content or function.
2. Tools
3. Rules
4. Processes
Click on Search to scan any or all groups
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
The SmartGD&T
On-Line-Tutor
SmartGD&T Solution #2
A Collection of Voiced Over,Animated Training Segments
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
This is an example of the just-in-time GD&T tutorials which make up the On-Line Tutor.
This segment describes the sixth and final step in the Datum Reference Frame Establishment Process.
SmartGD&T On-Line Tutor
TheOn-Line Tutor
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
This is an example of the pop-up Topic Menu for the On-Line Tutor.
The Topic Menu provides access to each segment of the tutorial and also indicates their duration.
TheOn-Line Tutor
SmartGD&T On-Line Tutor
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build internal support teams!
SmartGD&T Solution #3
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
Multi Metrics. Inc.provides on-site & remote
ASME Y14.5M 1994 based
Implementation & Training
build internal support teams!
SmartGD&T Solution #3
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
Automate GD&T processes!
SmartGD&T Solution #4
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
Automate GD&T processes!
SmartGD&T Solution #4
Multi Metrics licenses
to help software developers automate
1. GD&T encoding in the CAD world and
2. GD&T decoding in the CAM and CAI worlds
SmartGD&T Technology
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
InnovMetric Software Inc. the masters of dense point cloud metrology.
• IMI has built a comprehensive SmartGD&T Technology based GD&T decoding and processing engine in PolyWorks, their highly esteemed dense point cloud metrology software system,
• has completely automated geometry processing algorithm selection in keeping with SmartGD&T Technology based fundamental rules,
• has completely automated the Datum Reference Frame establishment process, based on the applicable SmartGD&T Technology patent, and
• has produced a GD&T processing system which is as ergonomic as it is powerful.
Multi Metrics’ first SmartGD&T Technology partner is
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How can we help you ?
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
Please visitwww.multimetrics.com
and give us a call at650-328-0200
Copyright © 2004 - 2008 by Multi Metrics, Inc. Menlo Park, CA All Rights Reserved
Thank you !&
Special Thanks to
Spatial !
Bill Tandler