As bearings rotate under load the components see material fatigue. The basic life formula, also know as the L10 life formula is used to calculate the number of revolutions before a failure occurs. Life can vary considerably, it is affected by many variables that the formulas cannot account for. The formulas are simply a guideline and should no be relied upon for critical applications.
|L10=(Cr/P)3 • 106 Revolutions||L10=Basic rating life Cr=Basic dynamic load rating(kgf) n=R.P.M. fn=Speed factor|
|L10h=500 • f3h fh=fn • (Cr/P), fh=(33.3/n)1/3||L10h=Basic rating life in hours P=Equivalent load(kgf) fh=Life factor|
|Lubrication||CL||Bearing type||a CM|
|Oil or Grease||1||Hybrid||4|