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GD&TforBodyCoursecontent课程内容Introduction介绍WhatisGD&T什么是GD&TWhatisGD&T什么是GD&TAuthorisation批准ApplicationApplicationMoreinformationHowGD&TRelatestoFordThe5StepProcess5StepProcessStep1UtilisenewdesignconceptMasterControlPlanMasterControlPlanStep2EstablishDatumReferenceFrameDatumReferenceFrame(ReferencePocketGuidePage8)DatumFeaturesPrimaryDatumPlanePrimaryDatumPlanePrimaryDatumPlaneDatumTargetAreasDatumTargetAreasSecondaryDatumFeatureSecondaryDatumFeatureSecondaryDatumFeatureSupportingapanelonthedesignatedDatumTargetAreasandusingthefourwaylocatorremovesanother2Lineardegreesoffreedomresultinginall3Linearand2Rotationaldegreesoffreedomconstrained.TertiaryDatumFeatureTertiaryDatumFeatureTertiaryDatumFeatureSupportingapanelonthedesignatedDatumTargetAreasusingthefourwayandtwowaylocatorsremovesallsixdegreesoffreedom.Step3CommonTermsandDefinitionsMaterialConditionsMaximumMaterialConditionLeastMaterialConditionRegardlessofFeatureSizeVirtualConditionVirtualCondition(Shaft)VirtualCondition(Hole)GeometricControlsFeatureControlFrame(ReferencePocketGuidepage3)GeometricCharacteristicSymbolGeometricControlsPERPENDICULARITYPERPENDICULARITYLMCPOSITIONPOSITIONThetermtodescribetheperfect(theoreticalexact)locationofindividualfeaturesinrelationshipwithadatumreferenceorotherfeature(s).IngeneralthePOSITIONcontrolisusedtolocateuniformfeaturesofsizee.g.holesshaftsslotsetc.VerificationPositionToleranceZonesPositionalToleranceZone1(Cylindrical)PositionalToleranceZone2(NonCylindrical)BOUNDARYBOUNDARYAsnoDiametersymbolprecedesthepositionaltoleranceanoncylindricalzoneisinferred.BOUNDARYBOUNDARYBOUNDARYBOUNDARYBOUNDARYZeroatMMCconceptZeroatMMCconceptMExampleofcurrentspecificationExampleofcurrentspecificationExampleofcurrentspecificationZeroatMMCconceptMThespecifiedFeatureofSizeisn