It is actually tungsten carbide, which is used for harder materials
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It is actually tungsten carbide, which is used for harder materials. Normally a steel ball is used, but the ball has to be harder than the substance being tested. Tungsten is hard, tungsten carbide is much harder.
Following speeds and feeds for solid-tooth, high-speed-steel, circular, metal-cutting saws are recommended by Saws International, Inc.
sfpm=surface feet per minute=3.142Xblade diameter in inchesXrpm of saw shaft/12
Use at own risk.