1、ASME Y14.5.2-2000(Revision of ASME Y14.5.2-1995)CERTIFICATION OFGEOMETRICDIMENSIONING ANDTOLERANCINGPROFESSIONALSAN ASME STANDARDAN ASME STANDARDCERTIFICATION OFGEOMETRIC DIMENSIONING ANDTOLERANCINGPROFESSIONALSASME Y14.5.2-2000(Revision of ASME Y14.5.2-1995)Date of Issuance: October 31, 2001This St
2、andard will be revised when the Society approves the issuance of anew edition. There will be no addenda issued to this Edition.ASME is the registered trademark of The American Society of Mechanical Engineers.This code or standard was developed under procedures accredited as meeting the criteria forA
3、merican National Standards. The Standards Committee that approved the code or standardwas balanced to assure that individuals from competent and concerned interests have had anopportunity to participate. The proposed code or standard was made available for public reviewand comment that provides an o
4、pportunity for additional public input from industry, academia,regulatory agencies, and the public-at-large.ASME does not “approve,” “rate,” or “endorse” any item, construction, proprietary device,or activity.ASME does not take any position with respect to the validity of any patent rights asserted
5、inconnection with any items mentioned in this document, and does not undertake to insure anyoneutilizing a standard against liability for infringement of any applicable letters patent, nor assumeany such liability. Users of a code or standard are expressly advised that determination of thevalidity o
6、f any such patent rights, and the risk of infringement of such rights, is entirely theirown responsibility.Participation by federal agency representative(s) or person(s) affiliated with industry is not tobe interpreted as government or industry endorsement of this code or standard.ASME accepts respo
7、nsibility for only those interpretations of this document issued inaccordance with the established ASME procedures and policies, which precludes the issuanceof interpretations by individuals.No part of this document may be reproduced in any form,in an electronic retrieval system or otherwise,without
8、 the prior written permission of the publisher.The American Society of Mechanical EngineersThree Park Avenue, New York, NY 10016-5990Copyright 2001 byTHE AMERICAN SOCIETY OF MECHANICAL ENGINEERSAll Rights ReservedPrinted in U.S.A.FOREWORDThe American Society of Mechanical Engineers (ASME), recognizi
9、ng the needs andbenefits associated with standard qualifications for professionals using the Y14.5 Standard,established the Y14.5.2 Subcommittee on Certification in October 1988. The Subcommitteewas instructed to develop a standard that could be used as the basis of an ASME Programfor Certification
10、of Geometric Dimensioning and Tolerancing Professionals (GDTP). Thisprogram provides the means to ensure proficiency in the understanding and application ofthe geometric dimensioning and tolerancing principles expressed in Y14.5. Those principlesform an essential element of engineering language.This
11、 is a voluntary standard which sets forth the qualifications for two levels of certification.The first level, Technologist GDTP, provides a measure of an individuals ability tounderstand drawings which have been prepared using the language of Geometric Dimensioningand Tolerancing, as defined in the
12、Y14.5 Standard. The second level, Senior GDTP, providesthe additional measure of an individuals ability to select and apply geometric controls todrawings.Primary changes to this revision are higher percentages of questions per section to increasethe applications emphasis on geometric dimensioning an
13、d tolerancing and the criteria forpassing the examination.ASME codes and standards are developed and maintained with the intent to representthe consensus of concerned interests. Revisions will be made periodically to the Standardto incorporate changes that appear necessary or desirable, as demonstra
14、ted by the experiencegained from the application of the requirements. Approved revisions will be publishedperiodically.The Committee welcomes proposals for revisions to this Standard. Such proposals shouldbe as specific as possible: citing the paragraph number(s), the proposed wording, and adetailed
15、 description of the reasons for the proposal. Correspondence should be sent to theAmerican Society of Mechanical Engineers, Att: Secretary, Y14 Main Committee, ThreePark Avenue, New York, NY l0016-5990.The Y14 Main Committee and the various subcommittees regularly hold meetings, whichare open to the
16、 public (except for the Y14.5.2 Subcommittee when considering items of aconfidential nature). Persons wishing to attend any meeting or to apply to become a memberof the Committee should contact the Secretary of the Y14 Main Committee.The original Standard was approved by the Board on Standardization
17、 on April 26, 1995.This revised Standard was approved by the Board on Standardization on November 27, 2000.iiiASME STANDARDS COMMITTEE Y14Engineering Drawing and Related DocumentationPractices(The following is the roster of the Committee at the time of approval of this Standard.)OFFICERSF. Bakos, Jr
18、. ChairK. Wiegandt, Vice-ChairC. J. Gomez, SecretaryCOMMITTEE PERSONNELA. Anderson, Dimensional Control Systems, Inc.J. Baker, Textron AutomotiveF. Bakos, Jr., Eastman Kodak Co.D. E. Bowerman, Copeland Corp.J. V. Burleigh, The Boeing Co.R. A. Chadderdon, Southwest ConsultantsM. E. Curtis, Jr., Rexno
19、rd Corp.D. Day, Monroe Community CollegeC. Ferguson, WM Education ServiceL. W. Foster, Lowell W. Foster Associates, Inc.C. J. Gomez, The American Society of Mechanical EngineersB. Harding, Purdue UniversityK. King, Naval Surface Warfare CenterA. Krulikowski, General Motors PowertrainH. Lachut, Alsto
20、m Power, Inc.J. Liska, Aerojet Propulsion DivisionP. McCuistion Ohio UniversityP. E. McKim, Caterpillar, Inc.R. Nieukirk, Alternate, Caterpillar, Inc.P. Tremblay, U.S. Department of the Army, ARDECB. DiNardo, Alternate, U. S. Department of the Army, ARDECG. H. Whitmire, ConsultantK. E. Wiegandt, San
21、dia National LaboratoryB. Wilson, The Boeing Co.P. Wreede, Hutchinson Technology, Inc.SUBCOMMITTEE Y14.5.2 CERTIFICATIONF. Bakos, Chair, ConsultantC. Ferguson, Vice Chair, WM Education ServiceJ. Millman, Secretary, The American Society of MechanicalEngineersA. Anderson, Dimensional Control Systems,
22、Inc.D. Day, Monroe Community CollegeK. Dobert, Engineering Animation, Inc.P. Drake, ConsultantL. Foster, Lowell W. Foster Associates, Inc.G. A. Hetland, Ph.D., Hutchinson Technology, Inc.ivD. Honsinger, ConsultantD. Karl, Karl Engineering Services, Inc.P. Mares, Douglas Aircraft Co.P. McCuistion Ohi
23、o UniversityP. McKim, Caterpillar, Inc.M. Meloro, Northrop Grumman Corp.R. Nickolaisen, Dimensional Engineering ServicesvCONTENTSForeword . iiiCommittee Roster . iv1 Introduction 11.1 Scope . 11.2 Purpose 12 Certification Levels and Qualifications 22.1 Certification Levels . 22.2 Qualifications 23 T
24、est Requirements (Examination) . 33.1 Technologist Level Examination . 33.2 Senior Level Examination . 34 Certification Process . 44.1 Application Process . 44.2 Certification 44.3 Recertification 4Mandatory AppendicesA Technologist Level Body of Knowledge . 5B Senior Level Body of Knowledge . 8viAS
25、ME Y14.5.22000ENGINEERING DRAWING AND RELATED DOCUMENTATION PRACTICESCERTIFICATION OF GEOMETRIC DIMENSIONINGAND TOLERANCING PROFESSIONALS1 INTRODUCTION1.1 SCOPEThis Standard establishes certification requirementsfor a Geometric Dimensioning and Tolerancing Profes-sional (GDTP). Certification will be
26、 based upon thecurrent edition of the Y14.5 Dimensioning and Toleranc-ing Standard, its appendices, and the application of itsprinciples and concepts.1.2 PURPOSEThis Standard provides requirements and qualifica-tions to be used in certifying GDTPs. These require-ments and qualifications recognize th
27、e knowledge, train-ing, and the experience necessary to understand, apply,and teach the principles as set forth in the current1edition of Y14.5. A GDTP might typically be employedas, but is not limited to:(a) design engineer(b) production or manufacturing engineer(c) process engineer(d) quality engi
28、neer(e) tool or gage engineer(f) engineering manager(g) user or programmer, CAD, CAM, CAE, soft-ware, etc.(h) drafter(i) checker(j) engineering consultant(k) educator(l) inspector(m) contract engineer(n) project engineer(o) technical specialistASME Y14.5.220002 CERTIFICATION LEVELS AND QUALIFICATION
29、S2.1 CERTIFICATION LEVELSThere shall be two (2) levels of GDTP Certification:(a) Technologist(b) SeniorCertification at each level indicates that the individualhas demonstrated competence in the areas described insubparas. 2.1.1 and 2.1.2.2.1.1 Technologist Level. Understanding themeaning of the sym
30、bols, modifiers, and relationshipsof Geometric Dimensioning and Tolerancing (GD and(b) successfully passing the Senior GDTP examina-tion. Being a certified GDTP technologist is not requiredto qualify for taking the examination for Senior Level.ASME Y14.5.220003 TEST REQUIREMENTS (EXAMINATION)3.1 TEC
31、HNOLOGIST LEVEL EXAMINATIONThe Technologist Level examination is a maximumof four hours in duration, consisting of 100 150questions. The examination is a closed book, multiplechoice, written examination, evaluating the applicantsknowledge of GD TOLERANCECALCULATION AND APPENDICES(a) general need for
32、 expressing tolerances(b) application(1) means of expressing tolerances(2) controlling features of size(3) controlling other features(c) direct tolerancing methods(1) general(a) limit dimensioning(b) plus and minus tolerancing(2) metric limits and fits(3) limits and tolerance symbols(4) tolerance sy
33、mbols and limits(5) millimeter tolerancing(a) unilateral tolerancing(b) bilateral tolerancing(c) limit dimensioning(d) with basic dimensions(6) inch tolerances(a) unilateral tolerancing(b) bilateral tolerancing(c) limit dimensioning(d) with basic dimensions(7) angle tolerances(8) plated or coated pa
34、rts(9) single limits(10) tolerance accumulation(a) chain dimensioning(b) base line dimensioning(c) direct dimensioning(11) dimensional limits related to an origin(d) limits of size(1) individual feature of size (Rule #1)(a) when form control does not apply(b) indicating that perfect form at MMC notr
35、equired(2) relationship between individual features(a) no relationship unless otherwise specified(b) zero tolerance of orientation(c) zero tolerance of position(d) control with general note(e) relate dimensions to a datum referenceframework with a general note(e) applicability of RFS, MMC, and LMC(1
36、) appropriate applications(2) all applicable geometric tolerances (Rule #2)(3) alternate practice for position control(4) effect of RFS9(5) effect of MMC(6) effect of zero tolerance at MMC(7) effect of LMC(8) effect of zero tolerance at LMC(f) screw threads(1) feature(2) modifier(g) gears and spline
37、s(h) virtual/resultant condition(1) determining the appropriateness of MMCand LMC(2) virtual condition determination(3) resultant condition determination(4) datum features at virtual condition(5) calculating inner and outer locus(i) angular surfaces(j) conical tapers(k) flat tapers(l) radius(m) stat
38、istical tolerancing(1) application to assemblies(2) identification(n) tolerances of location(1) utilization of modifiers(a) effects of RFS (implied)(b) effects of MMC(c) effects of LMC(2) displacement allowed by datum features atMMC(3) calculating positional tolerance(4) zero positional tolerance at
39、 MMC(5) simultaneous requirements(6) separate requirements(7) projected tolerance zone(8) nonparallel holes(9) counterbored holes(10) closer control at one end of a feature(11) bidirectional positional tolerancing(12) noncircular features(13) coaxial controls(14) concentricity(15) symmetry(o) form(1
40、) straightness(a) surface(b) axis(c) center plane(d) applied on a unit basis(2) flatness(a) surfaceMANDATORY APPENDIX BASME Y14.5.2-2000(b) applied on a unit basis(3) circularity(4) cylindricity(p) profile(1) profile of a line(2) profile of a surface(3) coplanarity(4) for plane surfaces(5) on conica
41、l features(q) orientation tolerances(1) angularity(a) of a surface(b) applied to features of size(2) parallelism(a) of a surface(b) applied to features of size(3) perpendicularity(a) of a surface(b) applied to features of size(r) runout tolerances(1) circular(2) total(s) Y14.5 Appendices(1) Appendix
42、 A Principal Changes and Im-provements(a) Figures(b) Scope, definitions and general dimensioning(c) General tolerancing and related principles(d) Symbology(e) Datum referencing(f) Tolerances of location(g) Tolerances of form, profile, orientation, andrunout(h) Principal changes and improvements(i) F
43、ormulas for positional tolerancing(j) Form, proportion, and comparison ofsymbols(k) Former practices(l) Decision diagrams for geometric control(2) Appendix B Formulas for Positional Toler-ancing(a) General(b) Formula symbols(c) Floating fastener case(d) Fixed fastener case(e) Provision for out-of-sq
44、uareness when pro-jected tolerance zone is not used(f) Coaxial features(g) Limits and fits10(3) Appendix C Form, Proportion, and Compar-ison of Symbols(a) General(b) Form and proportion(c) Comparison(4) Appendix D Former Practices(a) General(b) Definition for feature of size(c) Applicability of RFS,
45、 MMC, and LMC(d) Tangent radii(e) Datum feature symbol(f) Projected tolerance zone(5) Appendix E Decision Diagrams For Geo-metric Control(a) Purpose(b) Functional requirements(c) Reference to standard(d) Geometric controls(e) Choosing other controls(f) Use of modifiers(g) Datums(1) Datum modifiers(2
46、) Multiple datumsB4 APPLICATION OF MODIFIERS IN FEATURECONTROL FRAMES(a) types of modifiers(1) Regardless of Feature Size (RFS)(2) Maximum Material Condition (MMC)(3) Least Material Condition (LMC)(b) application(1) to the toleranced feature(2) to datums(3) when applicable(a) to geometric tolerances
47、(b) to datums(4) zero tolerance at MMC(5) results of datum features modified(a) RFS (implied)(b) MMC(c) LMC(6) results of pattern of features modified(a) RFS (implied)(b) MMC(c) LMC(7) simultaneous requirementsMANDATORY APPENDIX B ASME Y14.5.2-2000B5 COMPOSITE TOLERANCING(a) location of a pattern of
48、 features(1) location of a pattern of features(2) interrelationship of individual features withina pattern(3) multiple patterns of features; separate require-ments11(b) composite profile tolerancing(c) part verification methods(1) functional gaging(2) graphical analysis(3) mathematical analysis(d) a
49、pplication of composite positional tolerancingversus two single-segment tolerancingRELATED DOCUMENTSEngineering Drawing and Related Documentation PracticesDecimal Inch Drawing Sheet Size and Format.Y14.1-1995Metric Drawing Sheet Size and Format.Y14.1M-1995Line Conventions and Lettering Y14.2M-1992(R1998)Multiview and Sectional View DrawingsY14.3M-1994Pictorial Drawings Y14.4M-1989(R1994)Dimensioning and Tolerancing Y14.5M-1994Mathematical Definition of Dimensioning and Tolerancing Principles Y14.5.1M-1994Certification of Geometric Dimensioning and Tolerancing Professionals
