>> P.186
Ⅱ-178LubricationPrecautionforUseGreaseisnotpre-packedintheSTseries,sopleaseperformadequatelubricationasneeded.BothofoillubricationandgreaselubricationareavailableintheSTseries.Forgreaselubrication,useofhigh-qualitylithium-soapbasegreaseisrecommended.Oilisfedfrom❶FittingRecommendedfitfortheSTseriesisindicatedinTable5.AstheSTseriesperformsrotationandrotaryandlinearmotionatthesametime,theradialinternalclearancemustbesmallerwhenshockloadorloadaccompaniedbyvibrationisapplied.Especiallywhenverticalaxisapplicationorhighaccuracymotionisrequired,itisrecommendedtosettheradialinternalclearanceatzeroorunderaslightly-preloadedcondition.Excessivepreloadwillshortenthelife,sobecarefulnottosetlowerlimitvalueofradialinternalclearancebelowthevaluestatedinTable6.Table5RecommendedfitOperationalconditionsToleranceclassShaftHousingholeNormaloperationalconditionsk5,m5H6,H7Forverticalaxisorhighaccuracyn5,p6J6,J7Table6Lowerlimitofradialinternalclearanceunit:μmNominaldimensionsofinscribedcirclediameterFwmmLowerlimitofradialinternalclearanceOverIncl.46- 2610- 31018- 41830- 53050- 65080- 880100-10❷RacewaySinceSTseriesoperateswithashaftasaracewaysurface,theshaftshouldbeheat-treatedandground.RecommendedvaluesforsurfacehardnessandroughnessoftheshaftareshowninTable7andtherecommendedvaluefortheminimumeffectivehardeningdepthisshowninTable8.Table7SurfacehardnessandroughnessofracewayItemRecommendedvalueRemarkSurfacehardness58～64HRCWhenthesurfacehardnessislow,multiplytheloadratingbyhardnessfactor(1).Surfaceroughness0.2μmRaorlower(0.8μmRyorlower)Whereaccuracystandardislow,around0.8μmRa(3.2μmRy)isalsoallowed.Note(1)Forhardnessfactor,refertoFig.3inpageⅢ-5.Table8inimumeffectivehardeningdepthofshaftunit:mmShaftdiameterRecommendedvalueforminimumeffectivehardeningdepthOverIncl.─280.828501.0501001.5❸StrokelengthForstrokelengthused,80%ofthemaximumstrokelengthstatedinthedimensiontableisrecommended.❹OperatingtemperatureThemaximumoperatingtemperatureis120˚Candtemperatureupto100˚Cisallowedforcontinuousoperation.Whenthetemperatureexceeds100˚C,contactIKO.❺AssemblyoperationofexternalcylinderandshaftWheninsertingashaft,becarefulnottoshocktheball.Afterassembling,correctthepositionoftheretainertobeinthecenteroftheexternalcylinder.Afterassemblingtheexternalcylindertothehousing,inserttheshaftsoftly.Movetheretaineraswellastheshaftuntiltheycontactonesideofthesurfaceandstop.Thenpushtheshaftnottodamageballsorracewaytothepositionahalfofthemaximumstrokelengthandreturnitbythesamelength(ahalfofthemaximumstroke)sothattheretainerispositionedregularlyatthecenteroftheexternalcylinder.Fig.2Mountingexamplestheoilholeontheexternalcylinder.
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