搜索
InterpretingGeometricDimensioningandTolerancing-GDTBonusTolIntroductionBonusTolerancingandVirtualConditionBoundariesInterpretingGeometricDimensioningandTolerancing-GDTFormulaFormulaforCalculatingBonusToleranceHOLEActualSize(maximuminscribedcylinder)BonusTolerance-MMC+OriginalGeometricTolerance=BonusGeometricTolerance=TotalGeometricToleranceSHAFTMMCBonusTolerance-ActualSize(minimuminscribedcylinder)+OriginalGeometricTolerance=BonusGeometricTolerance=TotalGeometricToleranceInterpretingGeometricDimensioningandTolerancing-GDTExerciseFora∅21.9–22.5shaft,completethetablebelowfortheallowabletotaltoleranceusingthefollowingformula’s:MMC–ActualSize=BonusToleranceBonus+OriginalTolerance=TotalToleranceActualFeaturesizeM∅0.50M∅0.35∅0.60M∅0M∅0.40M∅0.600.07M∅0.20ABCAABCALDCJCE22.522.422.021.922.250.60.070.6InterpretingGeometricDimensioningandTolerancing-GDTCalculations1ACalculatingBonusToleranceandwhyitisallowedMMC-ActualSize=BonusGeometricTolerance+OrigGeometricTolerance=TotalGeometricTolerance22.5022.5000.500.50InterpretingGeometricDimensioningandTolerancing-GDTChart1AFora∅21.9–22.5shaft,completethetablebelowfortheallowabletotaltoleranceusingthefollowingformula’s:MMC–ActualSize=BonusToleranceBonus+OriginalTolerance=TotalToleranceActualFeaturesizeM∅0.50M∅0.35∅0.60M∅0M∅0.40M∅0.600.07M∅0.20ABCAABCALDCJCE22.522.422.021.922.250.60.070.5InterpretingGeometricDimensioningandTolerancing-GDTCalculations1BCalculatingBonusToleranceandwhyitisallowedMMC-ActualSize=BonusGeometricTolerance+OrigGeometricTolerance=TotalGeometricTolerance22.5022.400.10.500.60InterpretingGeometricDimensioningandTolerancing-GDTChart1BFora∅21.9–22.5shaft,completethetablebelowfortheallowabletotaltoleranceusingthefollowingformula’s:MMC–ActualSize=BonusToleranceBonus+OriginalTolerance=TotalTolerance22.522.422.021.922.25ActualFeaturesizeM∅0.50M∅0.35∅0.60M∅0M∅0.40M∅0.600.07M∅0.20ABCAABCALDCJCE0.50.61.00.60.07InterpretingGeometricDimensioningandTolerancing-GDTReadingFCFLet’slookatwhyweallowthisgrowthintoleranceM∅0.50ABCWecanreadtheFeatureControlFrameas:“theaxismaybeoutofpositionamaximumof0.5atmaximummaterialconditiontoAforangleandBandCfordistance.=I’mpositioning∅=adiameterTol=towithin=thatmatesMA=whilethepartseatsonABC=andisdistancedfromBandCInterpretingGeometricDimensioningandTolerancing-GDTDiagramHowbigmusttheholebetogoovertheshaft?InterpretingGeometricDimensioningandTolerancing-GDTVirtualConditionFora∅21.9–22.5shaft,completethetablebelowfortheallowabletotaltoleranceusingthefollowingformula:Bonus+OriginalTolerance=TotalToleranceActualFeaturesizeM∅0.50ABC22.522.422.021.922.250.50.61.023.023.023.0Inallcasesa23.0diameterboundaryisprotectedInterpretingGeometricDimensioningandTolerancing-GDTBonusTolIntroductionCompletetheexerciseexamplesonTotalToleranceInterpretingGeometricDimensioningandTolerancing-GDTChartCompletedFora∅21.9–22.5shaft,completethetablebelowfortheallowabletotaltoleranceusingthefollowingformula’s:MMC–ActualSize=BonusToleranceBonus+OriginalTolerance=TotalToleranceM∅0.50M∅0.35∅0.60M∅0M∅0.40M∅0.600.07M∅0.20ABCAABCALDCJCEActualFeaturesize22.522.422.021.922.2500.10.50.60.250.50.61.01.10.750.35.450.850.950.60.60.60.60.60.600.10.50.60.250.40.50.91.00.650.60.71.11.20.850.070.070.070.070.070.20.30.90.80.45InterpretingGeometricDimensioningandTolerancing-GDTDeviationPartPartDrawingforDeviationexercise∅0.40MABC∅14.2514.0012.0±0.1ACB25.050.0InterpretingGeometricDimensioningandTolerancing-GDTDeviationExerciseCompletechartsectionsA.BandCusingtheillustrationshown.A)Whatisthediameterofthealloweddeviationfromtrueposition?B)Whatisthediameterofthedeviationzoneformedbytheactualdeviationfromtrueposition?C)Isthepartgood?150.0424.8414.00250.1225.1014.13350.0825.0314.24450.6425.1614.07549.8724.9414.00649.7325.0014.16750.0024.6214.18850.0325.0314.30949.2424.5714.18DimensionfromDatumCDimensionfromDatumBActualHoleSizeAnswersABCInterpretingGeometricDimensioningandTolerancing-GDTInspectingFromtheFeatureControlFrameforthehole.PositionWhatistheGeometricControl?WhatisPositioned?AdiameterThefunctionofthehole?ItmatesWhilstseatedon?DatumfeatureAAnddistancedfrom?DatumfeatureB&CWhatwouldthisholemorethanlikelymatewith?AShaftWhatsizewouldhavebeenusedtodesignthisshaft?13.60VirtualCondition∅0.40MABC∅14.00–14.25InterpretingGeometricDimensioningandTolerancing-GDTInspectingOfthese9partsasproduced,aretheygoodparts?Weknowhowmuchtheyareallowedtobefromthedrawing.Holeissupposedtobe50.0fromDatumCand25.0fromDatumBAnyofthesepartsmeasuretothesedimensions?Parts7&6Concentratingontheholefirst.ColumnAwantstoknowhowmuchpositionaltoleranceweareallowedintheasproducedcondition.0.40HowmuchpositionaltolerancedoyougetatMMC?Holes1&5ArethereanypartsproducedatMMC?InterpretingGeometricDimensioningandTolerancing-GDTMMCHolesinchartCompletechartsectionsA.BandCusingtheillustrationshown.A)Whatisthediameterofthealloweddeviationfromtrueposition?B)Whatisthediameterofthedeviationzoneformedbytheactualdeviationfromtrueposition?C)Isthepartgood?DimensionfromDatumCDimensionfromDatumBActualHoleSizeAnswersABC0.400.40150.0424.8414.00250