PRESS2010_EN

1128/1208

ーExcerpt fromJIS B 0022（1984）ーJIS B 0021（1998）SφAAABAAB tlenmuaDil krammutaDenap mutaDFor indicating geometrical tolerances on drawings, line and plane can be indicated separately for defining form, but for defining perpendicularity tolerance and coaxiality tolerance, datum mark, line and plane must be offered.※1　character are the example※2　triangle symbol not fully painted is also availableActual surfaceActual figure of circleActual figure of circleDatum＝center of the smallest circumcicleActual surfaceActual surfaceDatum＝axis of the smallest external cylinderActual surfaceDatum＝center plane defined by parallel planesActual surfaceActual datum form＝plane Character for indicating datum※1Triangle symbol for indicating datum※2Datum＝the center of the smallest circumscribed sphereActual datum form＝four contact points on block with v groovePractical datum form＝the largest incircleDatum＝center of the largest incirclePractical datum form＝the smallest circumcirclePractical datum form＝the largest internal cylinderDatum＝axis of the largest internal cylinderPractical datum form＝the smallest external cylinderDatum＝plane defined by chassisPractical datum＝surface of chassis1126Geometrical tolerance without dutamsKind of toleranceSymbolFeatureStraightness toleranceFlatness toleranceCircularity toleranceCylindricity toleranceForm toleranceExample of indicating datumsKindDatum drawingACenter point of sphereCenter point of holeCenter point of axisAxis of holeAxial axisThe surface of componentCenter plane of component with parallel planesGeometrical tolerance with dutamsKind of toleranceOrientation toleranceLocation toleranceRun-out toleranceCircular run-out toleranceFeatureSymbolParallelism tolerancePerpendicularity tolerancePositional toleranceCoaxiality toleranceSymmetry toleranceDatum formDatum graphic markIndicating datumDatums for Geometrical Tolerances