Drawing Checking Reference Guide

Drawing Checking Reference Guide Date posted: 9/15/2004 - Revision 2

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DRAWING CHECKING REFERENCE GUIDE

TABLE OF CONTENTS

TOPIC PAGE

ALL DRAWINGS, PARTS & ASSEMBLIES 2 SAND CASTINGS, DIE CASTINGS 3 FORGINGS, CUTOUTS/CORES 4 MACHINING & SLOT DIMENSIONING DETAIL 5 DIMENSIONING DETAIL USING SLOTS AS DATUMS 6 DIMENSIONING DETAIL FOR SAND CASTINGS 7 DIMENSIONING DETAIL USING EDGES AS DATUMS 8 THREADS 9 O RING GROOVES 10 PULLEYS, FLYWHEELS, ETC. 11 FABRICATIONS, WELDS, BRAZING, BENDS 12 GASKETS, FLANGES 13 GASKETS, FLANGES DIMENSIONING DETAIL 14 TUBES 15 GEARS, SPLINES, SPRINGS 16 STANDARD PARTS 17 ASSEMBLIES 18 SUPPLIER DRAWINGS, NON-CUMMINS 19 TABULATIONS, MISCELLANEOUS 20 TUBE BEADS, ETC., WIRING HARNESSES 21

This guide was developed as a quick reference for reviewing and checking Cummins drawings. The purpose is to identify and

eliminate common errors that are found on released drawings. It is organized into categories of similar manufacturing processes and/or part features. Within these categories, the guide is broken into sections that refer to views, dimensions and tolerances, notes, standards and title, revision and structure blocks. It is mostly phrased in the form of questions. The questions are to be asked concerning your particular drawing. It doesn’t mean that everything mentioned will apply to your drawing. This guide is not intended to be a substitute for the proper Cummins standards and practices. This guide was developed by the HHP Checking Forum Group. The group is still meeting bimonthly and would like to continue to add content. If you would like to offer any comments and/or additions to this guide, please contact Bruce Trotter.


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ALL DRAWINGS, PARTS & ASSEMBLIES

Views:

-Are datum planes, points, axes and coordinate systems turned off? -Are there excessive hidden or tangents lines on views? -Are views oriented and projected correctly and labeled? -Do cross section views show crosshatching properly, spacing and angle? -Have proper view scales been notes? “FULL”, “HALF” or decimal value

Dimensions & Tolerances:

-Update to ASME Y14.5M standard -99074 GPS template -Have dimensions been reviewed for Classification of Characteristics? -Have “breaks” been used on dimension witness lines and leader lines?

Notes:

-Are the general notes on the sheets that they apply to? -The words “REF. NO. 1” to be used when referring to reside on, tabbed or assembly items.

Standards:

-10059, 16061 on all metallic parts, 18111 -10012 search on IMS at EFES CEC -Remove 16216 -Check Standards By Noun Name on the Product Definition Tools web site -Has proper material been specified? See 99003, Example: 2x,xxx plastics, rubber, etc., 3x,xxx steels, 4x,xxx irons, 5x,xxx aluminums -Proper spacing of standards in title block, Example: “16040;16061;16062 & SEE DETAILS”

Title. Rev &, Structure blocks:

-Update format -Does drawing have noun name, item number, identifier, release number, correct item control, etc.? -Is date shown in proper format? DDMMMYY -Cummins Inc. vs. Cummins Engine Co. -Obsolete drawings, parts & assemblies are to follow 99077, obsolete symbol applies only to tabbed parts

All drawings

Design Considerations

-Have standard design clearances been exceeded? Cast to cast minimum clearance: .25 IN or 6 MM Cast to machined minimum clearance: .125 IN or 3 MM Cast to fabricated minimum clearance: .25 IN or 6 MM Fabricated to fabricated minimum clearance: .25 IN or 6 MM


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SAND CASTINGS, DIE CASTINGS

Views:

-Are datum target points and balloons shown in 2 views only? -Are datum target points and balloons shown in other views where necessary?


-Have proper number of decimal places been used? 1 place metric, 2 place inch -Do datum target points relate to gtols? -Has casting been dimensioned to indicate that draft is additive per 16040? If not a note similar to the following is required, "DIMENSION MARKED (SYMBOL) ORIGINATE FROM THE INITIAL PICKUP POINTS AND GO TO THE THEORETICAL INTERSECTION OF SURFACE A AND THE DRAFTED SURFACE. DIMENSIONS MUST BE HELD PER 16040, MINUS DRAFT. DRAFT IS AS SHOWN IN DETAIL A."

Notes:

-Is cast ID note present? “CAST PATTERN NO. AND CASTING DATA PER INSP. STD. 16040 IN APPROXIMATE LOCATION SHOWN” “XX AREA TO BE CAST SMOOTH AND FLAT WITHIN 1 DEGREE.”

Standards:

16040, 16061, 16062, 16233

Cast Iron & Cast Aluminum

Title , Rev &, Structure blocks:

-Has the “Made from casting” cell been filled in? -If casting is a reside on, has the reside on block been used? See 99005 for example.

Views:

-Has draft been shown properly? -Are datum target points and balloons shown in 2 views only? -Are datum target points and balloons shown in other views where necessary?


-Has draft been dimensioned or has draft angle been noted?

Notes:

Standards:

16061, 16071, 16197, 16558, 18173

Die Casting

Title, Rev &, Structure blocks:


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FORGINGS, CUTOUTS/CORES

Views:

-Has draft been shown properly? -Are datum target points shown in 2 views only? -Are datum target points shown in other views where necessary?


-Has draft been dimensioned or has draft angle been noted?

Notes:

Standards:

16061, 16089, 16233

Forging


Views:


-3 ways to dimension cores: -Dimension in the parent part, file will be named xxxxxxx_cutout -Define by letting the electronic file be the master and use note below. -Dimension as a stand alone part, file will be an ID 77 and have a noun name of CUTOUT,xxxxx -Does cutout drawing have enough dimensions for it to be built? -Does cutout need locating dimensions?

Notes:

-“THE CAD MODEL IS THE MASTER SPECIFICATION FOR THIS ITEM. REFER TO THE CAD MODEL FOR ANY DIMENSIONAL INFORMATION NOT DISPLAYED ON THE DRAWING”

Standards:

Cutouts/cores



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MACHINING

Views:

-Does finish stock need to be shown?


-Are dimensions of origins shown in all 3 directions, are they being used and do they make sense? -Do the datum target points exist after machining? -Does datum structure make sense? -Are all dimensions toleranced or basic w/callouts? -See sand & die casting machining dimensioning scheme below -See slot dimensioning example below. -Are surface finish marks oriented per ASME Y14.36M-1996?

Notes:

-Proper designation of datum callout in a note: Centerline “DATUM A” -“CENTER IN DIAMETER XX WITHIN +/- 0.4 FOR INITIAL PICKUP” -“GRIND OFF CAST PATTERN NO. AND STEEL STAMP, ETCH OR INK STAMP ITEM NO. IN LOCATION SHOWN.”

Standards:

16061

Milling, turning, boring, holes, slots


-Has surface finish been designated?


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MACHINING, CONT.


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MACHINING, CONT.


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MACHINING, CONT.


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MACHINING, CONT.

Views:

-Have threads been shown to proper length and trimmed if necessary?


-Internal metric threads get “H” designation -External metric threads get “g” designation -Do counterbore depths need to be specified?

Notes:

-All threads: “EACH TOLERANCE OF ORIENTATION OR POSITION AND DATUM REFERENCE SPECIFIED FOR A THREAD APPLI ES TO THE MINOR DIA. (INTERNAL) OR MAJOR DIA. (EXTERNAL).” -Metric internal threads: “SCREW THREADS MUST CONFORM TO ASME B1.13M.” -Inch threads: “SCREW THREADS MUST CONFORM TO ASME B1.1.” -Metric Str. Thd O Ring threads: “STRAIGHT THREAD O-RING PORTS MUST CONFORM TO SAE J2244/1 (ISO6149).” -Inch Str Thd O Ring threads: “STRAIGHT THREAD O-RING PORTS MUST CONFORM TO SAE J1926-1.” -Metric pipe threads: “PIPE THREADS MUST CONFORM TO ASME B1.20.4.” -Inch Pipe threads: “PIPE THREADS MUST CONFORM TO ASME B1.20.3.” -Inch Pipe thread designation: (See B section 244-252 for details) Thread Group 1 Non-Pressure Thread Group 2 Pressure S Standard F Flush

Standards:

-Metric Str. Thd O Ring threads: remove SAE J514, add SAE J2244/1 (ISO6149) -Inch Str Thd O Ring threads: remove SAE J514, add SAE J1926-1 -Inch pipe threads: 16189, 18161


Threads

Design Consideration

-Is there sufficient thread engagement: Steel 1.25 X Dia Cast Iron 1.5 X Dia. Aluminum & Brass 2 X Dia. -Is there sufficient tap drill depth, see B section 257-260 -Countersink guidelines, see 16088 5.4 & 99015 6.2.6.9


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MACHINING, CONT.

Views:


-Has groove been fully detailed? Surface finish, angles, radii, edge breaks -See o ring groove dimensioning example below

Notes:

Standards:

O ring grooves



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MACHINING, CONT.

Views:


Notes:

-Balancing note

Standards:


Pulleys, flywheels, dampers, flexplates

Design Consideration

-Have undercuts been added where surfaces mate? See B section 111-116


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FABRICATIONS

Views:

-Have Cummins welding symbols been used?


-Metric: one place decimal -Inch: two place decimals -Remove the word ”STOCK” from material thickness dimensions, the word “GAGE” or “GA.” is acceptable

Notes:

-“ALL WELDS MUST CONFORM TO ANSI/AWS A2.4.” -“XX AREA TO BE FREE OF WELD & WELD SPATTER.”

Standards:

16403 for welds, 18004 for brazing, 18095 -Remove 18128


Welds & brazing


-Will welding cause surfaces to warp? Additional tolerances or GD&T may be necessary

Views:

-Is a developed view necessary?


-Metric: one place decimal for contour, two place for material thickness and bend radius -Inch: two place decimals for contour, three place for material thickness and bend radius -Remove the word ”STOCK” from material thickness dimensions, , the word “GAGE” or “GA.” is acceptable

Notes:

Standards:

16061, 18095


Bends, Punch pressing


-Bend radius to be 1.5 times material thickness minimum, 2 times preferred -Be aware of minimum length between bends, too short of length requires use of forming die and is supplier dependent -Do flatness, perpendicularity or parallelism require ments exceed the limits of 18095? If so, then tolerances or GD&T may be necessary


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GASKETS, FLANGES

Views:


-Contour & hole locating: Metric: two place decimal Inch: three place decimal -See dimensioning scheme example below when mounting holes serve as functional datums.

Notes:

Standards:

Gaskets, flanges



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GASKETS, FLANGES, CONT.


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TUBES

Views:

-Is tube oriented correctly on drawing, longest leg on the start end? -Does drawing adhere to 99016 guidelines? -Have non standard tube beads been detailed? -If Parflange bead detail is required, has the symbol on drawing? -If welded, have Cummins weld symbols been used?


-Is XYZ table used and points labeled? -Have XYZ crosshairs been used and edited to fit? -Do XYZ values match the XYZ crosshairs orientation? -Have appropriate decimal places been used? Metric: two place decimal Inch: three place decimal -Is die or tube bender dimensions in inch or metric? -Is tubing material inch or metric?

Notes:

-Remove developed length note, except for high pressure fuel injection tubes, see 99016 -Have tube ends been noted? -Tube diameter and wall thickness?

Standards:

16061, 16454, 18289 -Does tube type listed in 16454 agree with allowable noun name? -Remove 12900 16403 on welded tubes


Tubes, Low pressure & High pressure


-Have minimum bend radii been exceeded? (per supplier capability) -Has minimum distance between bends been followed? (per supplier capability)


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GEARS, SPLINES

Views:


Notes:

Standards:

All gears & splines


-Has proper format been used? -Has proper gear/spline table been used or does supplier agree to a different table? -Does Cummins table agree with supplier’s info?

SPRINGS

Views:

-Has spring start part been used? Start part generates part and drawing.


Notes:

-Are 6 standard notes present? -Has compressing and load loss note been filled in?

Standards:

95016, 98047, 98124 -Material spec dictates whether shot peening is necessary.

Helical compression

springs


-Has table been filled out?


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STANDARD PARTS

Views:


Notes:

-If not special, have appropriate Cummins standard been applied? -Have appropriate industry standards been applied? -Check Capscrew Cross Reference on the Product Definition Tools web site for released capscrews -Check PDF 99023 for duplication of parts

Standards:

-Has PMT 99082 been checked for required noun names? See also PTC 1-20-107


Capscrews, fittings, o-rings


-Prior to releasing any new capscrews or o-rings, approval must be gotten from standards


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ASSEMBLIES

Views:

-ID 21 Manufacturing Assembly, is drawing necessary? -ID 27 Option Graphics, have phantom views been shown for mating parts?


-ID 16 Engineering Assembly must contain dimensions or tolerances -Have proper number of decimal places been used?

Notes:

-Assembly components or reside on items are to be noted as reference items. Example: “REF. NO. 1” -ID 27 “GRAPHICS SHOWN IN PHANTOM ARE NOT PART OF THE OPTION, BUT HAVE BEEN ADDED FOR THE PURPOSE OF ILLUSTRATION AND MAY NOT BE CURRENT.”

Standards:

-ID 13 Permanent Assembly, have standards been applied to piece items? -ID 17 Component Assembly, check for 10012

Assemblies


-Update new table -See 99005 for examples of standard tables -ID 17-27 use different formats -ID 27 drawings are to be on C size format only -Tabulations of ID 27 options are not allowed


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SUPPLIER DRAWINGS

Views:

-Has supplier’s original drawing integrity been maintained?


Notes:

-Are there any notes, standards, etc. that contradict supplier’s drawing?

Standards:

-99078 & Pro/E Practices PTC 1-20-127

All supplier drawings


-Is supplier’s name on the list? Check web site: http://scm.cummins.com/purch/suppliergraphicstable.htm -Is the proper block on the drawing? (non-dis closure) -Is supplier’s part number on their drawing?

NON-CUMMINS

Views:

-Views may or may not be present on ID 15-2


Notes:

-Is supplier’s name & part number on the drawing? -“MAY BE PURCHASED FROM:”

Standards:

-Has 99093 been followed for ID codes 15-2?

Non-Cummins, 15-1 & 15-2


-Does 15-1 have structure? -Is the supplier information block on the drawing for ID 15-2? -15-2 Noun name does not have to adhere to Cummins noun name convention, but must still be 25 characters or less. -Identifier on 15-2 to be “NON-CUMMINS SERVICE ITEM”.


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TABULATIONS

Views:

-Has ID 79 model been set to be the active model?


Notes:

Standards:

All tab sheets


-Does identifier has “-TAB” included? -Have any item numbers been lost from parametric table or not been retrieved? -Has proper table been used? -Do tabbed items have correct MC_TYPE?

MISCELLANEOUS

Views:

-ID code 10, 13 or 15? -Is it bulk hose?


Notes:

Standards:

Hoses



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MISCELLANEOUS, CONT.

Views:


Notes:

Standards:

18289

Tube beads, cast & machined hose

connections, welded and

dimpled beads & oil gauge tubes


Views:


Notes:

Standards:

14126, 18270, 99046

Wiring harnesses


Documents

Drawing Checking Reference Guide