>> P.431
【Top】【Middle】ADGBEHCFI【Bottom】【Measuringpoint】【Measuringmethod】【Measurementinaxialdirection】(Xdirection)【Measurementinperpendiculardirectiontoaxis】(Ydirection)MeasurementofparallelismduringtableelevatingAtthelowermoststepofthetable(Hmin),aligntheindicatorwith0valueatthemeasurementpointEonthetableuppersurfacewiththetablemountingsurfaceasareference,andmeasureheightsattheremaining8points(AtoI)withthevalueasareference.Liftupthetableandperformthesamemeasurementatmiddle(Hmid)andupper(Hmax)steps.Thenobtaineachmaximumdifferencebetweenmeasurementvaluesatthesamepointatlower,middleanduppersteps.Takethemaximumdifferencevalueamongallthe9pointsastheparallelismduringtableelevating.【Samplecalculationofparallelismduringtableelevating】Measurementvalue(μm)LowerMiddleUpperMaximumdifferenceMeasuringpointABCDEFGHI12340-1-2-3-42-1420232-213510333-4142304562Ifmeasurementvaluesareasthoseindicatedinthetable,themaximumdifferencevalueamongallpointsshouldbe6μmatthepointH.Asaresult,theparallelismduringelevatingofthistableis6μm.MeasurementofsquarenessduringtableelevatingThesquarenessduringtableelevatingrelativetoasquarescaleshallbethesquarenessduringtableelevating.Atthelowerstepofthetable(Hmin),aligntheindicatorwith0relativetoasquarescale.Themaximumdifferenceinpicktestdeflectionatthetimewhenitisstrokedfromthelowerstepofthetable(Hmin)totheupperstep(Hmax)intheconditionshallbethesquarenessduringtableelevating.(Straightnesscomponentatthetimeoftablestrokeisincluded.)Placeasquarescaleattheposition10mmawayfromthetableedge,makeameasurementfor2directions,ballscrewaxialdirectionanddirectionperpendiculartotheaxis-andtakethemaximumvaluebetweenthe2valuesasthestraightnessduringtableelevating.Ⅲ15
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