Page 1 of Design and Selection for Bearing Applications by NTN Corporation Japan

6 design and selection for bearing applications 6-2 estimation of wear the life of an ntn engineering plastics bearing is defined by the wear of sliding surface as with an ordinary plain bearing the amount of wear varies with operating conditions such as sliding velocity pressure type of motion surface roughness of mating material and operating temperature generally the estimation of wear is given by the following formula rkpvt where r the amount of wear mm k wear factor mm min mpa m h p pressure mpa v sliding velocity m min t time h surface roughness of the mating material influences the wear of the ntn engineering plastics bearing therefore finish the surface to 0.1 to 0.8a moreover ntn recommends the hardness of shaft to be hrc 22 or higher since it is possible to reduce the wear when the shaft is harder

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