week1_gdt
DESCRIPTION
GD and T pptTRANSCRIPT
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Instructor:James ThornburghUnit 1GD&TAgenda:ObjectivesWhat is GDT?Why its ImportantMeasuring Break
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ObjectivesIdentify and draw GD&T SymbolsCorrectly use GD&T symbols Describe Maximum and Minimum material conditionsDescribe and correctly apply DatumsIdentify various inspection toolsDemonstrate the use of measuring devices.
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What is GD&T?GD&T is a way of dimensioning that takes into account function and fit with related parts.
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Why GD&T is importantAre Parts Made exactly to the drawings?GD&T allow drawing to be more accurately dimensioned, with looser tolerances.
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Why GD&T is important
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Measuring & Inspection DevicesHelp you to determine if a part is to spec.OpenYou measure the piece by its selfFunctionalYou put the piece in a fixture to determine if its goodGo, No-Go Gauges
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CalipersVernier
Dial
Digital
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Reading Vernier Caliper
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Reading Vernier Caliper
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MicrometersVernier
Digital
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Reading Vernier Micrometer
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Surface Plate
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Height Gauge
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Dial Indicator
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CMM
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Material ConditionsMMCMaximum Material ConditionWhen a Feature Weighs the MostSmall Hole, Large ObjectLMCLeast Material ConditionWhen a Feature Weighs the LeastLarge Hole, Small Object
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Material ConditionsRFSMaterial size doesn't matter for Tolerance
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GD&T Symbols
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Control TypesForm Controls Orientation ControlsLocation Controls
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Form ControlsStraightnessFlatness CircularityCylindricity
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Form Controls
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FlatnessMicroscopic View of surface
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Flatness
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Orientation ControlsParallelismPerpendicularityAngularityProfile
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Orientation Controls
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Angularity
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Profile
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Location ControlsPositionConcentricityRunout
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PositionWhat is the shape of a normal Tolerance Zone?
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PositionWhat is the Max it can be out of position?
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PositionThe Position Tolerance sets a round Tolerance ZoneUse Basic Dimensions that have Zero ToleranceSymbolized by drawing a Rectangle around Dim
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Position
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Runout
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Defining Datums
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Defining Datums
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Feature Control FrameHouses GD&T Symbols
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Datums for Plane
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Datums for Axis & Centerline
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What do They all Mean?
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What do They all Mean?
Datum B Feature11.91238.60.40.538.50.50.638.40.60.738.30.70.838.20.80.938.10.91.038.01.01.1
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Lab Assignments & HomeworkLabMeasuring HandoutWorkbook 16.1-16.3HomeworkRead Ch 16Do Review Questions 1-10