Friction is all around us. Without it we would find it very difficult to run, walk, or eve stand on our own two feet. We need friction to drive our cards and fly our airplanes; and we need friction for our motors to drive pumps. But when it comes to our plant machinery, friction is both friend and foe. If part of your job is greasing plant machinery, then you know well the battle against frictional forces that threatens the useful life of rolling element bearings
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