>> P.415
Ⅲ15MeasurementofparallelismduringtableelevatingAtthelowermoststepofthetable(Hmin),aligntheindicatorwith0valueatthemeasurementpointEonthetableuppersurfacewiththetablemountingsurfaceasareference,andmeasureheightsattheremaining8points(AtoI)withthevalueasareference.Liftupthetableandperformthesamemeasurementatmiddle(Hmid)andupper(Hmax)steps.Thenobtaineachmaximumdifferencebetweenmeasurementvaluesatthesamepointatlower,middleanduppersteps.Takethemaximumdifferencevalueamongallthe9pointsastheparallelismduringtableelevating.Ifmeasurementvaluesareasthoseindicatedinthetable,themaximumdifferencevalueamongallpointsshouldbe6μmatthepointH.Asaresult,theparallelismduringelevatingofthistableis6μm.MeasurementofsquarenessduringtableelevatingThesquarenessduringtableelevatingrelativetoasquarescaleshallbethesquarenessduringtableelevating.Atthelowerstepofthetable(Hmin),aligntheindicatorwith0relativetoasquarescale.Themaximumdifferenceinpicktestdeflectionatthetimewhenitisstrokedfromthelowerstepofthetable(Hmin)totheupperstep(Hmax)intheconditionshallbethesquarenessduringtableelevating.(Straightnesscomponentatthetimeoftablestrokeisincluded.)Placeasquarescaleattheposition10mmawayfromthetableedge,makeameasurementfor2directions,ballscrewaxialdirectionanddirectionperpendiculartotheaxis-andtakethemaximumvaluebetweenthe2valuesasthestraightnessduringtableelevating.ABCDEFGHI【Top】【Middle】【Bottom】【Measuringmethod】【Measuringpoint】【Samplecalculationofparallelismduringtableelevating】MeasuringpointMeasurementvalue(μm)LowerMiddleUpperMaximumdifferenceA1211B2-134C3452D4213E0000F-1234G-2335H-3236I-4-2-42【Measurementinaxialdirection】(Xdirection)【Measurementinperpendiculardirectiontoaxis】(Ydirection)
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