>> P.153
LubricationGreaseisnotpre-packedintheLMseries,sopleaseperformadequatelubricationasneeded.BothofoillubricationandgreaselubricationareavailableintheLMseries.Forgreaselubrication,useofhigh-qualitylithium-soapbasegreaseisrecommended.PrecautionforUse❶FittingForfittingwithahousinghole,clearancefitisusuallyusedbuttransitionfitcanalsobeusedforspecialusage.Foradjustableclearancetypeandopentype,theshaftdiametershallbesetasmuchaspossibletolessthanthelowerlimitoftheallowanceoftheinscribedcirclediameter,andwhilethedimensionofahousingholeshallbesettomorethantheupperlimitoftheallowanceoftheoutsidediameteroftheexternalcylinder.Table2RecommendedfitModelsandaccuracyclassLM,LMBLMEHighPrecision-f6,g6f5,g5h6ToleranceclassShaftHousingholeOrdinaryclearanceInterferenceClearanceTransitionfith6h5j6fitH7H6H7fitJ7J6J7❷ClearanceForadjustableclearancetypeandopentype,clearanceadjustmentcanbeeasilyperformediftheunitismountedintoahousingwiththeborediameterdimensionadjustable.However,ifalargepreloadisproducedduetotheclearanceadjustment,thedeformationatthecontactportionoftheexternalcylinderandballmaybecomelarge,therebydeterioratingthelife.Therefore,itisrecommendedtofinishtheshaftdimensionwithintherecommendedfittingandsettheclearanceatzeroorunderaslightly-preloadedcondition.Althoughtheclearanceadjustmentisperformedwhilemeasuringtheclearancewithadialgaugeafterfittinginashaft,amethodisgenerallytakentorotatetheshaftunderunloadedconditionduringclearanceadjustmentandstoptheadjustmentatthetimingwhendetectingaslightresistance.Atthistime,theLinearBushingclearanceisatzeroorunderaslightpreloadcondition.Meanwhile,theclearanceadjustmentforopentypewiththree-rowballracewayscannotbeperformed.lowanceoftheal❸RacewaySinceLMseriesoperateswithashaftasaracewaysurface,theshaftshouldbeheat-treatedandground.RecommendedvaluesforsurfacehardnessandroughnessoftheshaftareshowninTable3andtherecommendedvaluefortheminimumeffectivehardeningdepthisshowninTable4.Table3SurfacehardnessandroughnessofshaftItemSurfacehardnessRecommendedvalue58～64HRCSurfaceroughness0.2μmRaorlower(0.8μmRyorlower)RemarkWhenthesurfacehardnessislow,multiplytheloadratingbyhardnessfactor(1).Whereaccuracystandardislow,around0.8μmRa(3.2μmRy)isalsoallowed.Note(1)Forhardnessfactor,refertoFig.3inpageⅢ-5.Table4Minimumeffectivehardeningdepthofshaftunit:mmShaftdiameterOver-2850100Incl.2850100150Recommendedvalueforminimumeffectivehardeningdepth0.81.01.52.0❹WhenaccompaniedbyrotationalmotionLMseriesunitssupportonlylinearmotionbutdonotsupportrotationalmotion.Whenperformingrotationalmotionandlength,IKOStrokeRotaryBushingisrecommendedtobeused.And,fortheusagerequiringrotationalmotionandlinearmotionoflongstrokelength,itisrecommendedtouseincombinationwithIKOneedlebearingasshowninFig.3.linearmotionofshortstrokeSpacerShelltypeNeedlebearingStopring2.giFExampleofclearanceadjustment3.giFExampleoflinearmotionandrotationalmotionⅡ-145
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