Drafting Symbols - G-W Learning

1 Drafting Symbols 1 Copyright Goodheart-Willcox Co., not be reproduced or posted to a publicly accessible and Its Applications AdvancedReference MaterialDrafting SymbolsSymbols provide a common language for drafters all over the world. However, Symbols can be meaningful only if they are created according to the relevant standards or conventions. This document describes and illustrates common dimensioning, GD&T, architectural, piping, and electrical Dimensioning SymbolsStandard Dimensioning SymbolsThe size of dimensioning Symbols varies with text size, but it should be consistent with the height of the text. In the following illustration, h = text = letter heightStatisticalToleranceSquareShapeRef erenceCounterboreCountersinkDepth(or Deep)DimensionOriginRadiusSphericalRadiu sSphericalDiameterControlledRadiusPlaces or ByStandard Dimensioning h2 h2 hhhhhhhhh90 60 30 30 h215 hSlope Drafting Symbols 2 Copyright Goodheart-Willcox Co.

2 , not be reproduced or posted to a publicly accessible Dimensioning and Tolerancing SymbolsYou can either create your own library of GD&T Symbols , or use one of AutoCAD s GD&T fonts to insert the Symbols as text. The following tables show how to construct the hh2 h60 2 hIdentification letterDatum Feature SymbolDatum Target SymbolTarget Point and Target AreaMaterial Condition SymbolsOptional shoulderFilled or unfilledTarget area size(when used)DatumDatum target symbolwithout area sizeDatum target symbolwith area sizeTargetnumber2 hTarget pointTarget areaTarget lineMMC, maximummaterial conditionorMMB, maximummaterial boundaryRFS, regardless of feature size (no symbol,RFS is assumed unless otherwise specified)LMC, leastmaterial conditionorLMB, leastmaterial boundary90 hGD&T Symbol CreationGeometric Characteristic SymbolsStraightnessFlatnessCircularityCy lindricityProfile of a lineProfile of a surfacePositionConcentricitySymmetryPara llelismPerpendicularityAngularityCircula rrunoutororTotalrunoutRunoutOrientationL ocationProfileForm60 MovableDatum TargetSymbol Drafting Symbols 3 Copyright Goodheart-Willcox Co.

3 , not be reproduced or posted to a publicly accessible a dimensionIn the feature control frameh = lettering heightCombined withconventional toleranceFreeStateTangentPlaneProjectedT olerance ZoneBetweenStatistical ToleranceStatistical Tolerancing MethodsFeature Control Frame withStraightness Geometric Characteristic hIndependencyU nequallyDisposedProfile2X h30 h3 h2 h2 hhGD&T Symbol Creation Drafting Symbols 4 Copyright Goodheart-Willcox Co., not be reproduced or posted to a publicly accessible hh2 h60 60 Feature Control Frame with FlatnessGeometric Characteristic SymbolFeature Control Frame with CircularityGeometric Characteristic SymbolFeature Control Frame with CylindricityGeometric Characteristic SymbolFeature Control Frame with Profileof a Line Geometric CharacteristicSymbol and a Datum hh2 hh = lettering h2 hhh2 hGD&T Symbol Creation Drafting Symbols 5 Copyright Goodheart-Willcox Co.

4 , not be reproduced or posted to a publicly accessible hhhFeature Control Frame with Profileof a Surface Geometric CharacteristicSymbol and a Datum ReferenceFeature Control Frame with Parallelism Geometric CharacteristicSymbol and a Datum ReferenceFeature Control Frame with Perpendicularity Geometric CharacteristicSymbol and a Datum ReferenceFeature Control Frame with Angularity Geometric CharacteristicSymbol and a Datum Referenceh2 h60 2 h2 hh30 2 hh = lettering hGD&T Symbol Creation Drafting Symbols 6 Copyright Goodheart-Willcox Co., not be reproduced or posted to a publicly accessible RunoutTotal RunoutPositional Geometric CharacteristicSymbol and Tolerance in a Feature ControlFrame with Three Datum ReferencesFeature Control Frame with SymmetryGeometric CharacteristicSymbol and a Datum hRunout Symbols may be drawn open or filledh = lettering hh2 h45 hh2 h45 hhh2 hh2 hGD&T Symbol Creation Drafting Symbols 7 Copyright Goodheart-Willcox Co.

5 , not be reproduced or posted to a publicly accessible create GD&T Symbols as text, create a style using the font. Then use the lowercase alphabet to type the Symbols . The following table shows the symbol produced by each lowercase letter. Lowercase Letter Symbol Produced a b c d e f g h i j k l m n o p q r s t u v w x y z Drafting Symbols 8 Copyright Goodheart-Willcox Co., not be reproduced or posted to a publicly accessible DoorInterior DoorPocket DoorBifold DoorBypass DoorWindowLightingOutletRecessedLighting OutletWall LightingOutletFluorescentLight FixtureSingle ReceptacleOutletDuplex ConvenienceOutletTriplex ReceptacleOutletSpecial OutletFloor SingleReceptacle OutletFloor DuplexReceptacle OutletSingle Pole Switch3-Way Switch220 VOutletWeatherproofOutletThermostatDoorb ellFan HangerReceptacleClock HangerReceptacleTV OutletToiletWall HungToiletUrinalOvalVanitySinkRectangula rVanity SinkSingle Kitchen SinkDouble Kitchen SinkWater HeaterShowerShower w/ SeatTu bWasher/DryerRangeRefrigeratorFanConduit Common Architectural Symbols Drafting Symbols 9 Copyright Goodheart-Willcox Co.

6 , not be reproduced or posted to a publicly accessible SideFrontRight SideLeft SideFrontRight SideButtweldedScrewedSingle Line Piping Symbols90 Elbow45 ElbowTe e45 LateralCrossCapConcentricReducerEccentri cReducerUnionCoupling Drafting Symbols 10 Copyright Goodheart-Willcox Co., not be reproduced or posted to a publicly accessible ,PolarizedMicrophoneReceiver,EarphoneRes istor,GeneralResistor,AdjustableResistor ,VariableTransformer,GeneralTransformer, magnetic CoreShieldedTransformer, magnetic CoreAuto-Transformer,AdjustableCircuitBr eakerTwin TriodeUsing ElongatedEnvelopeVoltage Regulator,also, Glow LampPhototubeInductor, Winding,Reactor, GeneralMagnetic CoreInductorAdjustableInductorBallast LampFluorescent,2-Terminal LampIncandescentLampGroundChassisGroundC onnectors,Jack and PlugEngagedConnectorsTriode with DirectlyHeated Cathode andEnvelope Connectionto Base TerminalPentode UsingElongated EnvelopeAntenna,GeneralAntenna,DipoleAnt enna,LoopAntenna,CounterpoiseBattery, LongLine PositiveMulticellBatteryCapacitor,Genera lCapacitor.

7 VariableCommon Symbols for Electrical Diagrams