>> P.439
ConsiderationofOperationPatternsâ– CalculationofpositioningtimeThepositioningtimetakenwhentheprecisionpositioningtableactuallymovescanbeobtainedbythefollowingequation.Forapplicationsrequiringhighprecisionpositioning,thesettlingtimefromcompletionofcommandpulseinputtofullstopofthetableatthepositioningpointandvibrationdampingtimeofthemachinedevicemustbeconsideredinadditiontotheconstantspeedtravelingtimeandacceleration/decelerationtime.TablemovementTravelcommandTravelingdistanceL1tatctbtdtTimeTablemovementTravelcommandTravelingdistanceL2tatbtTimetdV1SpeedV1V2SpeedLong-distancepositioningLongdistanceinthiscontextreferstothedistanceforwhichthereisenoughconstantspeedtravelingtimewhentakingintoaccounttheacceleration/decelerationtime.t=++tdL1V1ta+tb2wheret:Positioningtimesta,tb:Acceleration/decelerationtimestc:Constantspeedtravelingtimestd:SettlingtimesL1:TravelingdistancemmV1:Travelingspeed(setspeed)mm/sShort-distancepositioningShortdistanceinthiscontextreferstothedistanceforwhichthereisnoconstantspeedtravelingtimebecausedecelerationoccursbeforereachingconstantspeed.t=++tdL2V2ta+tb2wheret:Positioningtimesta,tb:Acceleration/decelerationtimestd:SettlingtimesL2:TravelingdistancemmV1:Setspeedmm/sV2:Travelingspeedmm/sâ…¢23
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