>> P.153
LubricationⅡ-145Greaseisnotpre-packedintheLMseries,sopleaseperformadequatelubricationasneeded.BothofoillubricationandgreaselubricationareavailableintheLMseries.Forgreaselubrication,useofhigh-qualitylithium-soapbasegreaseisrecommended.❶FittingForfittingwithahousinghole,clearancefitisusuallyusedbuttransitionfitcanalsobeusedforspecialusage.Foradjustableclearancetypeandopentype,theshaftdiametershallbesetasmuchaspossibletolessthanthelowerlimitoftheallowanceoftheinscribedcirclediameter,andwhilethedimensionofahousingholeshallbesettomorethantheupperlimitoftheallowanceoftheoutsidediameteroftheexternalcylinder.Table2RecommendedfitModelsandaccuracyclassToleranceclassShaftHousingholeOrdinaryclearanceInterferencefitClearancefitTransitionfitLM,LMBHighf6,g6h6H7J7Precisionf5,g5h5H6J6LME-h6j6H7J7❷ClearanceForadjustableclearancetypeandopentype,clearanceadjustmentcanbeeasilyperformediftheunitismountedintoahousingwiththeborediameterdimensionadjustable.However,ifalargepreloadisproducedduetotheclearanceadjustment,thedeformationatthecontactportionoftheexternalcylinderandballmaybecomelarge,therebydeterioratingthelife.Therefore,itisrecommendedtofinishtheshaftdimensionwithintheallowanceoftherecommendedfittingandsettheclearanceatzeroorunderaslightly-preloadedcondition.Althoughtheclearanceadjustmentisperformedwhilemeasuringtheclearancewithadialgaugeafterfittinginashaft,amethodisgenerallytakentorotatetheshaftunderunloadedconditionduringclearanceadjustmentandstoptheadjustmentatthetimingwhendetectingaslightresistance.Atthistime,theLinearBushingclearanceisatzeroorunderaslightpreloadcondition.Meanwhile,theclearanceadjustmentforopentypewiththree-rowballracewayscannotbeperformed.Fig.2Exampleofclearanceadjustment❸RacewaySinceLMseriesoperateswithashaftasaracewaysurface,theshaftshouldbeheat-treatedandground.RecommendedvaluesforsurfacehardnessandroughnessoftheshaftareshowninTable3andtherecommendedvaluefortheminimumeffectivehardeningdepthisshowninTable4.Table3SurfacehardnessandroughnessofshaftItemRecommendedvalueRemarkSurfacehardness58～64HRCWhenthesurfacehardnessislow,multiplytheloadratingbyhardnessfactor(1).Surfaceroughness0.2μmRaorlower(0.8μmRyorlower)Whereaccuracystandardislow,around0.8μmRa(3.2μmRy)isalsoallowed.Note(1)Forhardnessfactor,refertoFig.3inpageⅢ-5.Table4Minimumeffectivehardeningdepthofshaftunit:mmShaftdiameterRecommendedvalueforminimumeffectivehardeningdepthOverIncl.-280.828501.0501001.51001502.0❹WhenaccompaniedbyrotationalmotionLMseriesunitssupportonlylinearmotionbutdonotsupportrotationalmotion.Whenperformingrotationalmotionandlinearmotionofshortstrokelength,IKOStrokeRotaryBushingisrecommendedtobeused.And,fortheusagerequiringrotationalmotionandlinearmotionoflongstrokelength,itisrecommendedtouseincombinationwithIKOneedlebearingasshowninFig.3.Fig.3ExampleoflinearmotionandrotationalmotionStopringSpacerShelltypeNeedlebearingPrecautionforUse
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