Profile Concentricity Theory

8/11/2019 Profile Concentricity Theory

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Applied Geometrics, Inc 2011 Page 1

Profile Concentricity

(the Y14.5 kind)


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Applied Geometrics Inc.


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Applied Geometrics Inc.

Mission Statement

Applied Geometrics, Inc. is committed to

train manufacturing industrys personnel

how to realize a higher return on investment

by utilizing a standardized, concise,

internationally accepted language of

engineering expression.


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Definition: Profile tolerancing is a method used to specify auniform amount of variation of a surface or line elements of a

surface.

Tolerance Zone: Profile tolerance specif ies a tolerance zone

confined by two equidistant profiles within which the entire

surface must lie.

Profile d k(Surface and Line)


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Profile d k(Surface and Line)


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Unilateral ProfileAlternate (Still allowed) Practice From 1994


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Unilateral Profile 2009


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Unequally Disposed Profile

Alternate (Still allowed) Practice From 1994


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Unequally Disposed Profile 2009


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Profile Between Two Points

A Symbol ( ) is used to indicate a tolerance applies to

a limited segment of a surface between designated extremes.


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Profile Non-Uniform Transition


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Default Transition Creates a Step


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Smooth Transition Definition


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Transition Needs To Be Defined


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Profile Non-Uniform Zone


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Profile All Over

The term ALL OVER is allowed.


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Profile All Over


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Profile Can ControlCo-planarity


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Datum Axis Definition

One Diameter of Sufficient Length


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One Short Diameter with aPlanar Datum Feature


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Two (or More) Short DiametersSufficiently Separated


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Coaxial Control One wrong way


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Datum Feature B Fails Position Requirement

Coaxial Control One wrong way


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Coaxial Control Another wrong way


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Coaxial Control Another wrong way


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Coaxial Control


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Coaxial Control


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Coaxial Control


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Runout (Circular and Total)

Definition: The composite deviation from the

desired form of a part surface of revolutionduring full rotation (360 deg.) of the part on adatum axis.

Tolerance Zone:A total width zone bounded by

two boundaries of revolution within which:Circular Runout: all points of each circular element

(cross-section) of the considered feature must l ieregardless of the size of the considered feature.

Total Runout: all points of the entire surface of theconsidered feature must lie regardless of the size ofthe considered feature.


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Runout (Circular and Total)Tolerance Value

Runout tolerance states how far an

actual surface is permitted to deviate

from the desired form implied by thedrawing during full rotation (360 deg.) of

the part on a datum axis.


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Circular RunoutSYMBOL MEANING


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Circular Runout


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Circular RunoutComposite Controls

CIRCULARITYCOAXIALITY

Position & Concentricity

DML STRAIGHTNESS


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Typical for Controlling Wobble

Only controls elements not overall shape

Circular RunoutTapered, Contoured, & Perpendicular Surfaces


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Circular RunoutTapered, Contoured, & Perpendicular Surfaces

Gages Must Be Perpendicular to the Nominal Surfaces


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SYMBOL MEANING

Total Runout


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Total Runout


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Total RunoutComposite Controls

CYLINDRICITYCOAXIALITY

Position & Concentricity

DML STRAIGHTNESS

SURFACE STRAIGHTNESS

(Cylindricity for NominallyCylindrical Features)


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Also Controls Wobble

Also Controls Shape

Total RunoutTapered & Perpendicular Surfaces


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Taper, Angularity, Concentricity Perpendicularity

Total RunoutTapered & Perpendicular Surfaces


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Definition: Concentricity is the condition

where the median points of all

diametrically opposed elements of allindividual cross-sections of a figure of

revolution are congruent with the axis

of a datum feature.

Concentricity r


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Concentricity r


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SYMBOL MEANING

Concentricity r


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A

A

Concentricity r


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Concentricity r

r


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Usually when a designer calls outconcentricity the true design

requirements are:Position j

Circular Runout

Total Runout t

Concentricity r


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Definition: Symmetry is the condition wherethe median point of all the opposedelements of the considered feature are

congruent with the center plane of thedatum feature.

Tolerance Zone: Symmetry tolerance zone isa total width tolerance zone within whichthe median points of the considered featuremust lie.

Symmetry i


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SYMBOL MEANING

Symmetry i


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Symmetry i


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Symmetry iLIKE

CONCENTRICTY

A DIFFICULTREQUIREMENT TO

INSPECT

Symmetry? i


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y y

Or Position? j

How Do I Deal with the Profile and


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Copyright, Applied Geometrics, Inc.

How Do I Deal with the Profile and

Concentricity in Calypso??

Come to Ryan Stauffers Presentation!! ;-)


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Copyright, Applied Geometrics, Inc.

Contact Info:

Mark E. Foster, President

Applied Geometrics, Inc.

(708) 867-5927 (Corporate HQ)

(248) 981-3536 (Direct/Mobile)

[email protected]

Documents

Profile Concentricity Theory