The initial load in Rockwell hardness test is 10KGf.
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Avionics Test Bench
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plan a fair test with timing.........
bash each rock with a hammer and see which one breaks first
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the answer is 10KGF
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Diamond is more than 1000 times harder than quartz, which is in
the 80 range in the Rockwell C. Diamond cannot be measured on the
Rockwell C scale. A diamond pyramid is actually used in the
Rockwell C test, which would be inconclusive.