LM Guide THK - Industrial Technologies

Индастриал Технолоджис www.industrial‐technologies.com.ua +38 044 498 21 94Point of SelectionCalculating the Nominal Life[fH: Hardness Factor]To ensure the achievement of the optimum loadcapacity of the LM Guide, the raceway hardnessmust be between 58 and 64 HRC.If the hardness is lower than this range, thebasic dynamic load rating and the basic staticload rating decrease. Therefore, it is necessaryto multiply each rating by the respective hardnessfactor (fH).Since the LM Guide has sufficient hardness, thefH value for the LM Guide is normally 1.0 unlessotherwise specified.[fT:Temperature Factor]If the temperature of the environment surroundingthe operating LM Guide exceeds 100, takeinto account the adverse effect of the high temperatureand multiply the basic load ratings bythe temperature factor indicated in Fig.12.In addition, the selected LM Guide must also beof a high temperature type.Note) LM guides not designed to withstand high temperaturesshould be used at 80°C or less.Please contact THK if application requirementsexceed 80°C.[fC: Contact Factor]When multiple LM blocks are used in close contactwith each other, it is difficult to achieve uniformload distribution due to moment loads andmounting-surface accuracy. When using multipleblocks in close contact with each other, multiplythe basic load rating (C or C0) by thecorresponding contact factor indicated inTable11.Note) If uneven load distribution is expected in a largemachine, take into account the respective contact factorindicated in Table11.Temperature factor fTHardness factor fH1.00.90.80.70.60.51.00.90.80.70.60.50.40.30.20.160 50 40 30 20 10Raceway hardness (HRC)Fig.11 Hardness Factor (fH)100 150 200Raceway temperature ()Fig.12 Temperature Factor (fT)Table11 Contact Factor (fC)Number of blocks used inclose contactContact factor fC2 0.813 0.724 0.665 0.616 or greater 0.6Normal use 1LM GuideIndustrial TechnologiesA1-77