How to adjust the cone angle of a Rockwell hardness tester?

The superficial Rockwell hardness value increases as the cone angle of the diamond indenter increases. For the 30N and 45N scales, angular variations have a significant impact on low hardness values but a smaller impact on high hardness values. For the 15N scale and the high-value hardness blocks of the 30N scale, there is almost no impact.

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