When your indexed tool tips snaps? .....

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He used crystaline silicone carbide (e.g., "Carborundum" abrasive) rather than a chip off a carbide tool tip - the latter are made with either Titanium carbide or Tungsten carbide, and are often made by compressing/sintering powdered carbide, so may not have the same electrical properties.
Regards, Tony
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Tony Jeffree

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