Changes to the Geometric Dimensioning and Tolerancing …

1 Changes to the ASME Changes to the ASME Dimensioning and Dimensioning and TolerancingTolerancingStandard,Standard, A SummaryA SummaryASME ASME :By:Jordan Pepin Jordan Pepin ASME GD&T Professional ASME GD&T Professional --Technologist & Senior LevelTechnologist & Senior LevelWelcome!ASME ASME Highlights Structural Changes (Formatting) New Symbology Terminology/Definition Changes Non-Uniform Zone Profile Custom Datum Reference FramesStructural Changes19942009 Section 1 Scope and DefinitionsSection 2 General TolerancingSection 3 SymbologySection 4 Datum ReferenceFramesSection 5 Tolerances of FormSection 6 Tolerances of OrientationSection 7 Tolerances of LocationSection 8 Tolerances of ProfileSection 9 Tolerances of RunoutSection 1 Scope and DefinitionsSection 2 General TolerancingSection 3 SymbologySection 4 Datum ReferencingSection 5 Tolerances of LocationSection 6 Tolerances of Form, Profile, Orientation, & RunoutNew SymbologyMovable Datum TargetAll OverUnequally Disposed ProfileTranslation ModifierIndependencyContinuous FeatureNew SymbologyMovable Datum TargetB1B2C1C2 Datum Target are movable - moving normal to surface unless other direction is stated[g].

2 010]A]B]C]New Symbology19942009 All Over[g] ]ALL OVER[g] ]New SymbologyUnequally Disposed Profile[g] XXXnXXX]A]B]C]Total Profile ToleranceAmount of tolerance in the plus-material directionNew Symbology19942009 Unequally Disposed Profile[g] n ]A] Alternate Practice in the 2009 standard[g] ]A]New SymbologyTranslation ModifierNew SymbologyIndependency;.375 =.010 Size tolerance also controls form(the feature cannot violate the perfect form boundary at MMC);.385;.365;.365 Perfect form boundary@MMCNew SymbologyIndependency;.375 =.010 Size tolerance also controls form(the feature cannot violate the perfect form boundary at MMC);.385;.365;.365 Perfect form boundary@MMCNew SymbologyContinuous FeatureMMC BoundariesNew SymbologyContinuous FeatureMMC Boundary*The Continuous Feature symbol can only be used for afeature of ;25=0>05[ ]:?).!% ]A]B ]Terminology/Definition ChangesTerminology/Definition Changes19942009 Modifiers- 1) Regardless of Feature Size (RFS)- Applicable to positioned features ordatum features- Specifies how datum is simulated(expanding TGC)- Default condition ( symbol notrequired)Modifiers- 1) Regardless of Feature Size (RFS)-Applicable to positioned features Regardless of Material Boundary (RMB)- When used on a datum feature- Specifies how datum is to be simulated(expanding TGC)- RFS, RMB are default condition-symbol has been removedTerminology/Definition Changes19942009 Modifiers- 2) Maximum Material Condition (MMC)- Applicable to toleranced features ordatum features- Specifies how datum is to be simulated(@ it s virtual condition)3) Least Material Condition (LMC)- Applicable to toleranced features ordatum features- Specifies how datum is to be simulated(@ it s virtual condition)Modifiers- 2) Maximum Material Condition (MMC)

3 - Applicable to positioned features Maximum Material Boundary (MMB)- When used on a datum feature- Specifies how datum is to be simulated(@ it s MMB, not virtual condition)3) Least Material Condition (LMC)- Applicable to positioned features Least Material Boundary (LMB)- When used on a datum feature - Specifies how datum is to be simulated (@ it s LMB, not virtual condition)2009 Modifier Example;25=0>05[ ]:?).!% ]A]B ]MMC (Maximum Material Condition)-Potential bonus positional toleranceMMB (Maximum Material Boundary)-Specifies how datum is simulatedTerminology/Definition ChangesTerminology/Definition Changes19942009 Resultant Condition1) The single worst-case boundary (the opposite of the virtual condition boundary)Actual Mating Envelope1) Clarified by giving more specific AMEterms for the different boundaries- Unrelated AME - Related AME (oriented and/or located)- Actual Minimum Material Envelope- Related Actual Minimum MaterialEnvelopeResultant Condition1) A variable boundary Actual Mating Envelope1) One term for a number of different possible boundaries depending on how it is used.

4 Non-Uniform Zone Profile[g]NON-UNIFORM]ababDatums and Degrees of FreedomCustom Datum Reference FramesCustom Datum Reference Frames[g].004]A]B][g].004]A]B]Custom Datum Reference Frames[g].004]A ]B ][x,y,u,v][z]Datum A is specified to constrain only 4 degrees of freedomDatum B controls the 5thdegree of freedom (translation in Z)YZLooking ForwardTwo critical components for successfulimplementation of the current standard for Dimensioning and Tolerancing -TrainingThe GD&T standard is another language We will not learn it correctly without adequate trainingEveryone must be on the same page-Design, Manufacturing, QualityNeeds to happen from the top-down-Management must head the effortToolsIt s one thing to put it on a must have software that is able to correctly evaluate complex GD&TMeasurement challenges-Datums (MMB, LMB, simultaneity)-Position (AME, simultaneity)-Profile (optimal fitting, simultaneity)-Custom Datum Reference Frames-Non-Uniform Zone ProfilesThank You For Coming!

5 TrainingBasic Blueprint ReadingGD&T - Introduction & FundamentalsGD&T - Advanced ApplicationToolsHand Tools / GagingSurface Finish / Form AnalysisContact / Vision CMM sInspection SoftwareContract Inspection Services (AIS)PQI