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Hardness Testing for bearings

Hardness is the property of a material that enables it to resist plastic deformation, usually by penetration. Hardness is not an intrinsic material property dictated by precise definitions in terms of fundamental units of mass, length and time. A hardness property value is the result of a defined measurement procedure. The hardness test of bearing surfaces is conducted with the SHR-3000 tester using the Rockwell hardness test method. The Rockwell hardness test method consists of indenting the test material with a diamond cone or a hardened steel ball indenter. The indenter is forced into the test material under a preliminary minor load of usually 150 kg. When equilibrium has been reached, an indicating device which follows the movements of the indenter and responds to changes in depth of penetration of the indenter is set to a datum position.A bearing’s internal clearance is defined as the total distance in which one bearing ring