>> P.186
LubricationGreaseisnotpre-packedintheSTseries,sopleaseperformadequatelubricationasneeded.BothofoillubricationandgreaselubricationareavailableintheSTseries.Forgreaselubrication,useofhigh-qualitylithium-soapbasegreaseisrecommended.OilisfedfromPrecautionforUse❶FittingRecommendedfitfortheSTseriesisindicatedinTable5.AstheSTseriesperformsrotationandrotaryandlinearmotionatthesametime,theradialinternalclearancemustbesmallerwhenshockloadaccompaniedbyvibrationisapplied.Especiallywhenverticalaxisapplicationorhighaccuracymotionisrequired,itisrecommendedtosettheradialinternalclearanceatzeroorunderaslightly-preloadedcondition.Excessivepreloadwillshortenthelife,sobecarefulnottosetlowerlimitvalueofradialinternalclearancebelowthevaluestatedinTable6.loadorTable5RecommendedfitOperationalconditionsNormaloperationalconditionsForverticalaxisorhighaccuracyToleranceclassShaftk5,m5n5,p6HousingholeH6,H7J6,J7Table6Lowerlimitofradialinternalclearanceunit:μmNominaldimensionsofinscribedcirclediameterFwmmOver361018305080Incl.61018305080100Lowerlimitofradialinternalclearance- 2- 3- 4- 5- 6- 8-10❷RacewaySinceSTseriesoperateswithashaftasaracewaysurface,theshaftshouldbeheat-treatedandground.RecommendedvaluesforsurfacehardnessandroughnessoftheshaftareshowninTable7andtherecommendedvaluefortheminimumeffectivehardeningdepthisshowninTable8.Table7SurfacehardnessandroughnessofracewayItemRecommendedvalueRemarkSurfacehardness58～64HRCSurfaceroughness0.2μmRaorlower(0.8μmRyorlower)Whenthesurfacehardnessislow,multiplytheloadratingbyhardnessfactor(1).Whereaccuracystandardislow,around0.8μmRa(3.2μmRy)isalsoallowed.Note(1)Forhardnessfactor,refertoFig.3inpageⅢ-5.theoilholeontheexternalcylinder.Table8Minimumeffectivehardeningdepthofshaftunit:mmShaftdiameterOver─2850Incl.2850100Recommendedvalueforminimumeffectivehardeningdepth0.81.01.5❸StrokelengthForstrokelengthused,80%ofthemaximumstrokelengthstatedinthedimensiontableisrecommended.❹Operatingtemperatureis120˚CandThemaximumoperatingtemperatureupto100˚Cisallowedforcontinuousoperation.Whenthetemperatureexceeds100˚C,contactIKO.temperature❺AssemblyoperationofexternalcylinderandshaftWheninsertingashaft,becarefulnottoshocktheball.Afterassembling,correctthepositionoftheretainertobeinthecenteroftheexternalcylinder.Afterassemblingtheexternalcylindertothehousing,inserttheshaftsoftly.Movetheretaineraswellastheshaftuntiltheycontactonesideofthesurfaceandstop.Thenpushtheshaftnottodamageballsorracewaytothepositionahalfofthemaximumstrokelengthandreturnitbythesamelength(ahalfofthemaximumstroke)sothattheretainerispositionedregularlyatthecenteroftheexternalcylinder.2.giFMountingexamplesⅡ-178
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