1、Truck Design Standard NUMBER: TDS-SD-10 TITLE: Dimensioning and Tolerancing Addendum REVISION: 3 WRITTEN / REVIEWED BY: D. Dimit APPROVED BY: Design Standards Committee REVISION DATE: November 2002 PRINTED COPIES OF THIS DOCUMENT MUST BE VERIFIED FOR CURRENT REVISION INTERNATIONAL TRUCK DIVISION DIM
2、ENSIONING AND TOLERANCING ADDENDUM-2000 INDEX SECTION 5 Tolerance of Location (See ASME Y14.5-1994.) SECTION 6 Tolerances of Form, Profile, Orientation, and Runout (See ASME Y14.5M-1994.) Introduction- A Acknowledgments- B SECTION 1 Scope, Definitions, and General Dimensioning General- 1.1 Definitio
3、ns- 1.2 Default GD&T Tolerance Block- 1.3 Fundamental Rules- 1.4 Dimensions Not to Scale- 1.5 Repetitive Features of Dimensions- 1.6 SECTION 2 General Tolerancing and Related Principles Perfect Form at MMC Not Required- 2.1 Relationship Between Individual Features- 2.2 Applicability of RFS, MMC, and
4、 LMC- 2.3 Statistical Tolerancing- 2.4 Baseline Dimensioning- 2.5 SECTION 3 Symbology Datum Feature Symbol Placement Surface- 3.1 All Around Symbol- 3.2 SECTION 4 Datum Referencing Immobilization of Part- 4.1 Temporary and Permanent Datums- 4.2 Datum Feature Precedence- 4.3 Specifying Datum Features
5、 at LMC- 4.4 Datum Features Not Subject to Size Variation- 4.5 Datum Features Subject to Size Variation- 4.6 Datum Target Dimensions- 4.7 Specifying Coaxial Datum Features- 4.8 Specifying Coplanar Datum Features- 4.9 Multiple Datum Features- 4.10 SECTION 7 Dimensioning and Tolerancing Practices forR
6、estrained Parts Definitions- 7.1 Datum Reference Frame- 7.2 Datum Targets- 7.3 Restraining Conditions- 7.4Restrained (Clamped)/Unrestrained Requirement- 7.5 Application of Tolerance To Side of Material - 7.6 SECTION 8 Dimensioning and Tolerancing For Vehicle Bodies General- 8.1 Definitions- 8.2 Vehi
7、cle Grid System- 8.3 Location of Datum Targets- 8.4 Establishing Datum Reference Frame for Vehicle Body Components/ Assemblies- 8.5 Restrained/Unrestrained Consideration for Vehicle Bodies- 8.6 This document is restricted and may not be sent outside International Truck and Engine Corporation or repr
8、oduced without permission from Corporate Technical Standards. Suppliers are required to assume all patent liability. 2000 International Truck and Engine Corporation November, 2002 Page 1 of 21 Copyright Navistar International Corporation Provided by IHS under license with INTERNNot for ResaleNo repr
9、oduction or networking permitted without license from IHS-,-,-A. INTRODUCTION International Truck Division has adopted an amended version of the ASME Y14.5M-1994 dimensioning and tolerancing standard (as amended by this addendum) for use on all product engineering ocumentation. dNote: This addendum
10、is a modification of the 1997 addendum adopted by General Motors Corporation, Chrysler Corporation, and Ford Motor Company. Permission to use and modify this agreement was ranted by Alex Krulikowski GM Team Member of the US Car GD&T Team. gThis addendum is created to address the following areas: 1.
11、Select an option from ASME Y14.5M 2. Clarifying a concept from ASME Y14.5M 3. Discouraging the use of a concept from ASME Y14.5M. 4. Including a concept not covered by ASME Y14.5M. Proposals to revise this addendum are evaluated on an annual basis. When a revision is published, the year of publicati
12、on will appear in the title of the addendum. All other standards referenced in ASME Y14.5M have not necessarily been adopted and should not be assumed to be invoked automatically. Current company standards will take precedence unless otherwise pecified. sIf a conflict exists between ASME Y14.5M-1994
13、 and ASME Y14.5.1M-1994, ASME Y14.5M-1994 is to e used. bNote: Where product engineering documentation is based on this addendum, this fact must be noted on the documentation or in a specification referenced on the document. B. ACKNOWLEDGMENT Sections one through six of this document represents the
14、consensus modification by International Truck (Division of International Truck and Engine Corporation) of the members of the US Car Geometric Dimensioning and Tolerancing Team for their sole use (with granted permission). Team members, whose names appear below, wish to acknowledge the many contribut
15、ions made by individuals from within their respective organizations, without whose support and assistance this document would not have been possible. CORE TEAM MEMBERS J. Dwayne Dimit, International Geoffrey Hegger, GD&T Consultant (QMC, Inc.) Gary L. Jones, International Mark H. Miller, GD&T Consul
16、tant (DQAT, Inc.) CONTRIBUTING MEMBERS Ron L. Campbell, GD&T Consultant (DQAT, Inc.) John M. Eavey, GD&T Consultant (DQAT, Inc.) Bryan R. Fischer, GD&T Consultant (QMC, Inc.) Bruce L. McMahon, GD&T Consultant (DQAT, Inc.) This document is restricted and may not be sent outside International Truck an
17、d Engine Corporation or reproduced without permission from Corporate Technical Standards. Suppliers are required to assume all patent liability. 2000 International Truck and Engine Corporation November, 2002 Page 2 of 21 Copyright Navistar International Corporation Provided by IHS under license with
18、 INTERNNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-1. Scope, Definitions, And General Dimensioning 1.1 General 1.1.1 Dimensioning And Tolerancing Standard. Dimensioning and tolerancing shall be in accordance with ASME. Y14.5M-1994 except for the items described
19、 in this addendum. References to Y14.5M herein shall mean ASME Y14.5M-1994. Figure 1-1 Note To Invoke International Truck Division Dimensioning and Tolerancing Addendum-2000 THIS DOCUMENT IS IN ACCORDANCE WITH ASME Y14.5M-1994 AS AMENDED BY THE INTERNATIONAL TRUCK DIVISION DIMENSIONING AND TOLERANCI
20、NG ADDENDUM2000.1.1.2 Titleblock Notes. The note shown in Fig. 1-1 must appear on drawings, databases, or documents, which are in accordance with the International Truck Divisions Dimensioning and Tolerancing Addendum-2000. The note shall be in the titleblock (or in the general notes). The note invo
21、kes this addendum. 1.2 Definitions 1.2.1 Free State. The condition where tolerances apply without restraint. 1.2.2 Shall: The word “shall” indicates mandatory requirements 1.3 Default GD&T Tolerance Block (See Figure 1-2) 1.3.1 Math Data. (Item#1) Unless otherwise specified all math data is assumed
22、basic. Geometric tolerances shall be applied. Math Data is the digital, mathematically precise content of the 3D CAD Model. Nominal dimensions of any feature can be derived from the Math Model. Note: Plus/Minus tolerances used with Math Data specify only the size tolerance of features of size. 1.3.2
23、 Profile Tolerance-All Surfaces With Blended Uniformity. (Item#2) Defines the allowable variation of continuous surfaces. A surface is continuous to the point where the surface has an interrupted change in direction. Blended uniformity requires that the surface is free from interrupted surface varia
24、tions. 1.3.3 Profile Tolerance-All Trim Edges. (Item#3) Defines the allowable variation of Trim Edges. A Trim Edge is defined as the material thickness of the part at the end of a surface. 1.3.4 Hole And Elongated Hole Size Tolerances. (Item #4) All Holes and Elongated Holes shall have a size tolera
25、nce. A plus/minus default tolerance applies to all unspecified holes and elongated holes on the drawing. The nominal sizes for the unspecified holes and elongated holes are defined by math data. This document is restricted and may not be sent outside International Truck and Engine Corporation or rep
26、roduced without permission from Corporate Technical Standards. Suppliers are required to assume all patent liability. 2000 International Truck and Engine Corporation November, 2002 Page 3 of 21 Copyright Navistar International Corporation Provided by IHS under license with INTERNNot for ResaleNo rep
27、roduction or networking permitted without license from IHS-,-,-1.3.5 Positional Tolerance-All Holes. (Items #5) Defines the Positional Tolerance for Cylindrical Features of Size that are not specified by a Feature Control Frame on the drawing. 1.3.6 Positional Tolerance-All Elongated Holes. (Item #6
28、) Defines the Positional Tolerance on Non-Cylindrical Features of Size (Elongated Holes only) that are not defined by a Feature Control Frame on the drawing. The Size, Size Tolerance, and Positional Tolerance of all Features of Size (except Holes and Elongated Holes) must be specified on the drawing
29、. UNLESS OTHERWISE SPECIFIED: 1.) ALL MATH DATA IS BASIC 2.) B M C MA 3 ALL SURFACES WITH BLENDED UNIFORMITY. 3.) M MCBA3 ALL TRIM EDGES. 4.) HOLE & ELONGATED HOLE SIZE TOLERANCES ARE 0.25. FOR HOLE & ELONGATED HOLE SIZES CONSULT MATH DATA. 5.) M MMCB A 3 ALL HOLES (CYLINDRICAL FEATURES OF SIZE) 6.)
30、 - BOUNDARY M MB M CA 3 ALL ELONGATED HOLES (NON-CYLINDIRICAL FEATURES OF SIZE) Figure 1-2 Default GD&T Tolerance Block Note: Datum reference and tolerances in Figure 1.2 are for example only and shall be specified to reflect individual drawing requirements. 1.4 Fundamental Rules. Add a new rule (o)
31、 to paragraph 1.4 of Y14.5M dimensions apply after heat treatment and/or plating but before painting. 1.5 Dimensions Not To Scale. Add the following sentence to paragraph 1.7.9(b) of Y14.5M. “Complete agreement” means the accuracy shall be within the capability of the CAD system. This document is re
32、stricted and may not be sent outside International Truck and Engine Corporation or reproduced without permission from Corporate Technical Standards. Suppliers are required to assume all patent liability. 2000 International Truck and Engine Corporation November, 2002 Page 4 of 21 Copyright Navistar I
33、nternational Corporation Provided by IHS under license with INTERNNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-1.6 Repetitive Features Or Dimensions. Delete the last sentence of paragraph 1.9.5 of Y14.5M and replace with the following sentence: Note: Where used
34、with a basic dimension, the “X” shall be placed outside the basic dimension frame. 2. General Tolerancing And Related Principles. 2.1 Perfect Form At MMC Not Required. Add the following to paragraph 2.7.2 of Y14.5M: “On a drawing where a titleblock (or general) note is used to override Rule #1, the
35、effects of Rule#1 may be reinstated for an individual feature of size. This is done by adding a straightness tolerance of zero at MMC to the feature of size.” 2.2 Relationship Between Individual Features. In paragraph 2.7.3 of Y14.5M options (a) or (b) are recommended. Option (c) or (d) are not reco
36、mmended. 2.3 Applicability of RFS, MMC, and LMC In paragraph of 2.8 of Y14.5M, Alternative Practice (b) is not recommended. 2.4 Statistical Tolerancing. The use of statistical tolerancing as described in paragraph 2.16 of Y14.5M is not recommended. 2.5 Baseline Dimensioning. When possible, the use o
37、f baseline dimensioning relative to datum features is required. The use of chain dimensioning should be avoided. Refer to figures 2-1 through 2-3 for examples. Overall dimensions take precedence over baseline dimensions. Refer to figures 2-2 and 2-3 for examples. Refer to paragraph 2.6 of ASME Y14.5
38、M for additional information. This document is restricted and may not be sent outside International Truck and Engine Corporation or reproduced without permission from Corporate Technical Standards. Suppliers are required to assume all patent liability. 2000 International Truck and Engine Corporation
39、 November, 2002 Page 5 of 21 Copyright Navistar International Corporation Provided by IHS under license with INTERNNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-FIGURE 2-1: USE OF BASELINE DIMENSIONING FROM DATUM FEATURES -SURFACES AS DATUM FEATURES- This documen
40、t is restricted and may not be sent outside International Truck and Engine Corporation or reproduced without permission from Corporate Technical Standards. Suppliers are required to assume all patent liability. 2000 International Truck and Engine Corporation November, 2002 Page 6 of 21 Copyright Nav
41、istar International Corporation Provided by IHS under license with INTERNNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-FIGURE 2-2: USE OF BASELINE DIMENSIONING FROM DATUM FEATURES -ARRAY OF HOLES AS DATUM FEATURES- This document is restricted and may not be sent
42、outside International Truck and Engine Corporation or reproduced without permission from Corporate Technical Standards. Suppliers are required to assume all patent liability. 2000 International Truck and Engine Corporation November, 2002 Page 7 of 21 Copyright Navistar International Corporation Prov
43、ided by IHS under license with INTERNNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-FIGURE 2-3: USE OF BASELINE DIMENSIONING FROM DATUM FEATURES -HOLE AND SLOT AS DATUM FEATURES- This document is restricted and may not be sent outside International Truck and Engin
44、e Corporation or reproduced without permission from Corporate Technical Standards. Suppliers are required to assume all patent liability. 2000 International Truck and Engine Corporation November, 2002 Page 8 of 21 Copyright Navistar International Corporation Provided by IHS under license with INTERNNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-3. SYMBOLOGY 3.1 Datum Feature Symbol Placement-Surface 3.1.1 Replace subsection (a) of paragraph 3.3.2 of Y14.5M with the following:
