Universal Digital Rockwell Indicator (new)
Rockwell Hardness Testing
The Rockwell hardness test is a hardness measurement based on the net increase in depth of an impression as a load is applied. Hardness values are commonly given in the A, B, C, and E scales. The higher the value in each of the scales, the harder the material.
Hardness has been variously defined as resistance to local penetration, scratching, machining, wear or abrasion. In the Rockwell method of hardness testing, the depth of penetration of an indenter under certain arbitrary test conditions is determined. The indenter may either be a steel ball of some specified diameter or a spherical diamond-tipped cont of 120 angle and 0.2 mm tip radius, called Brale. The type of indenter and the test load determine the hardness scales (A,B,C, etc)
A minor load of 3 kg or 10 kg is first applied, causing an initial penetration and holds the indenter in place. Then the dial is set to zero and major load is applied. Upon removal of the major load, the depth reading is taken while the minor load is still on. The hardness number may then be read directly from the scale.
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