1、ASME Y14.5.2-2017(Revision of ASME Y14.5.2-2000)Certification of Geometric Dimensioning and Tolerancing ProfessionalsEngineering Product Definition and Related Documentation PracticesASME Y1 4.5.2-201 7(Revision of ASME Y1 4.5.2-2000)Certification ofGeometricDimensioningand TolerancingProfessionalsx
2、Engineering Product Definition andRelated Documentation PracticesxDate of Issuance: June 15, 2017This Standard will be revised when the Society appr oves the issuance of a new edition.Periodically certain actions of the ASME Y14 Committ ee may be published as Cases. Cases are published on the ASME W
3、eb siteunder the Y14 Committ ee Page at http:/go.asme.org/Y14c ommitt ee as they are issued.Errata to codes and s tandards may be post ed on the ASME Web site under the Committ ee Pages to pr ovide corrections toincorrectly published item s, or to correct typographical or grammatical err ors in code
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11、,without the prior writ ten permission of the publisher .The American Society of Mechanical EngineersTwo Park Avenue, New York, NY 10016-5990Copyright 2017 byTHE AMERICAN SOCIETY OF MECHANICAL ENGINEERSAll rights reservedPrinted in U.S.A.CONTENTSForeword . . . . . . . . . . . . . . . . . . . . . . .
12、 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ivCommittee Roster . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . vCorrespondence With the Y14 Committee . . . . . .
13、 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . vi1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 Certification Levels and Qualifications . . . . . . . . . . . . . . . .
14、 . . . . . . . . . . . . . . . . . . . . . . . . . 13 Test Requirements (Examination) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 Certification Process . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
15、 . . . 3Mandatory AppendicesA Technologist Level Body of Knowledge for the ASME Y14.5M-1994 Examination . . . . . . . . . . . . 4B Senior Level Body of Knowledge for the ASME Y14.5M-1994 Examination . . . . . . . . . . . . . . . . . 7C Technologist Level Body of Knowledge for the ASME Y14.5-2009 Exa
16、mination . . . . . . . . . . . . . 10D Senior Level Body of Knowledge for the ASME Y14.5-2009 Examination . . . . . . . . . . . . . . . . . . 12iiiFOREWORDThe American Society of Mechanical Engineers (ASME), recognizing the needs and benefits associated with standardqualifications for professionals
17、using the ASME Y14.5 Standard, established the Y14.5.2 Subcommittee on Certification inOctober 1988. The Subcommittee was instructed to develop a standard that could be used as the basis of an ASMEProgram for Certification of Geometric Dimensioning and Tolerancing Professionals (GDTP). This program
18、providesthe means to ensure proficiency in the understanding and application of the geometric dimensioning and tolerancingprinciples expressed in ASME Y14.5. Those principles form an essential element of engineering language.This is a voluntary standard that sets forth the qualifications for two lev
19、els of certification. The first level, TechnologistGDTP, provides a measure of an individuals ability to understand drawings that have been prepared using the language ofgeometric dimensioning and tolerancing, as defined in the ASME Y14.5 Standard. The second level, Senior GDTP, providesthe addition
20、al measure of an individuals ability to select and apply geometric controls to drawings.Primary changes to this revision are higher percentages of questions per section to increase the applications emphasison geometric dimensioning and tolerancing and to revise the criteria for passing the examinati
21、on.The original Standard was approved by the Board on Standardization on April 26, 1995. This revised Standard wasapproved by the Board on Standardization on May 18, 2017.IN MEMORIAM: In memory of Don Day for his significant contributions to the development of this Standard and to the geometricdimen
22、sioning and tolerancing community.ivASME Y1 4 COMMITTEEEngineering Product Definition and Related DocumentationPractices(The following is the roster of the Committee at the time of approval of this Standard.)STANDARDS COMMITTEE OFFICERSW. Kaba, ChairJ. I. Miles, Sr., Vice ChairF. Constantino, Secret
23、arySTANDARDS COMMITTEE PERSONNELA. Anderson, Dimensional Dynamics, LLCF. Bakos, Frank Bakos AssociatesJ. V. Burleigh, UnaffiliatedF. Constantino, The American Society of Mechanical EngineersD. O. Coon, Bell HelicopterR. Courson, Ford Motor Co.K. Dobert, Siemens PLM Software, Inc.S. Hauger, John Deer
24、e MTICJ. B. Hoskins, The Boeing Co.J. Houck, Woodward, Inc.R. C. Jensen, Hexagon Manufacturing IntelligenceW. Kaba, Spirit AeroSystems, Inc.A. Krulikowski, Krulikowski Consulting, LLCE. McCarthy, UnaffiliatedP. J. McCuistion, MultimacJ. D. Meadows, James D. Meadows TOLERANCE CALCULATION ANDAPPENDICE
25、S(a) general need for 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
26、symbols(4) tolerance symbols 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 to
27、lerances(8) plated or coated parts(9) single limits(10) tolerance accumulation(-a) chain dimensioning(-b) baseline 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) indica
28、ting that perfect form at MMC notrequired(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 reference frame-work with a general not
29、e(e) applicability of RFS, MMC, and LMC(1) appropriate applications(2) all applicable geometric tolerances (Rule 2)(3) alternate practice for position control(4) effect of RFS(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)
30、feature(2) modifier(g) gears and splines(h) virtual/resultant condition(1) determining the appropriateness of MMC andLMC(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
31、tapers(k) flat tapers(l) radius(m) statistical 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 at MMC(3) calculating positiona
32、l tolerance(4) zero positional tolerance at 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 contro
33、ls(14) concentricity(15) symmetry(o) form(1) straightness(-a) surface(-b) axis(-c) center plane(-d) applied on a unit basis(2) flatness(-a) surface(-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(
34、5) on conical features(q) orientation tolerances(1) angularity(-a) of a surfaceASME Y14.5.2-20178(-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) t
35、otal(s) ASME Y14.5M-1994 Appendices(1) Appendix A, Principal Changes andImprovements(-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
36、, andrunout(-h) principal changes and improvements(-i) formulas for positional tolerancing(-j) form, proportion, and comparison of symbols(-k) former practices(-l) decision diagrams for geometric control(2) Appendix B, Formulas for Positional Tolerancing(-a) general(-b) formula symbols(-c) floating
37、fastener case(-d) fixed fastener case(-e) provision for out-of-squareness whenprojected tolerance zone is not used(-f) coaxial features(-g) limits and fits(3) Appendix C, Form, Proportion, and Comparisonof Symbols(-a) general(-b) form and proportion(-c) comparison(4) Appendix D, Former Practices(-a)
38、 general(-b) definition for feature of size(-c) applicability of RFS, MMC, and LMC(-d) tangent radii(-e) datum feature symbol(-f) projected tolerance zone(5) Appendix E, Decision Diagrams for GeometricControl(-a) purpose(-b) functional requirements(-c) reference to standard(-d) geometric controls(-e
39、) choosing other controls(-f) use of modifiers(-g) datums(-1) datum modifiers(-2) multiple datumsB-4 APPLICATION OF MODIFIERS IN FEATURECONTROL FRAMES(a) types of modifiers(1) RFS(2) MMC(3) LMC(b) application(1) to the toleranced feature(2) to datums(3) when applicable(-a) to geometric tolerances(-b
40、) 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 requirementsB-5 COMPOSITE TOLERANCING(a) location of a pattern of features(1) location of a patter
41、n of features(2) interrelationship of individual features within apattern(3) multiple patterns of features; separaterequirements(b) composite profile tolerancing(c) part verification methods(1) functional gaging(2) graphical analysis(3) mathematical analysis(d) application of composite positional to
42、lerancingversus two single-segment tolerancingASME Y14.5.2-20179MANDATOR Y APPENDIX CTE CHNOLOGIST LEVEL BODY OF KNOWLEDGEFOR THE ASME Y1 4.5-2009 EXAMINATIONThis Appendix provides the body of knowledge uponwhich the Technologist level examination for certificationto ASME Y14.5-2009 is based. This A
43、ppendix is referencedby para. 3.1 of this Standard.C-1 SCOPE, DEFINITIONS, AND GENERALDIMENSIONING(a) scope(b) references(c) definitions(d) fundamental rules(e) units of measure(f) types of dimensioning(g) application of dimensions(h) dimensioning features(i) location of featuresC-2 GENERAL TOLERANC
44、ING AND RELATEDPRINCIPLES(a) general(b) direct tolerancing methods(c) tolerance expression(d) interpretation of limits(e) single limits(f) tolerance accumulation(g) limits of size(h) applicability of modifiers on geometric tolerancevalues and datum feature references(i) screw threads(j) gears and sp
45、lines(k) boundary conditions(l) angular surfaces(m) conical tapers(n) flat tapers(o) radius(p) tangent plane(q) statistical tolerancingC-3 SYMBOLOG Y(a) general(b) use of notes to supplement symbols(c) symbol construction(d) feature control frame symbols(e) feature control frame placement(f) definit
46、ion of the tolerance zone(g) tabulated tolerancesC-4 DATUM REFERENCE FRAMES(a) general(b) degrees of freedom(c) degrees of freedom constrained by primary datumfeatures regardless of material boundary (RMB)(d) constraining degrees of freedom of a part(e) datum feature simulator(f) theoretical and phy
47、sical application of datumfeature simulators(g) datum reference frame(h) datum features(i) datum feature controls(j) specifying datum features in an order of precedence(k) establishing datums(l) multiple datum features(m) mathematically defined surface(n) multiple datum reference frames(o) functiona
48、l datum features(p) rotational constraint about a datum axis or point(q) application of maximum material boundary (MMB),least material boundary (LMB), and RMB to irregularfeatures of size(r) datum feature selection practical application(s) simultaneous requirements(t) restrained condition(u) datum r
49、eference frame identification(v) customized datum reference frame construction(w) application of a customized datum reference frame(x) datum targetsC-5 TOLERANCES OF FORM(a) general(b) form control(c) specifying form tolerances(d) form tolerances(e) application of free-state symbolASME Y14.5.2-201710C-6 TOLERANCES OF ORIENTATION(a) general(b) orientation control(c) orientation symbols(d) specifying orientation tolerances(e) tangent plane(f) alternative practiceC- 7 TOLERANCES OF LOCATION(a) general(b) positional tolerancing(c) positional tolerancing fundamentals, part I(d) positional
