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

http://hackaday.com/2012/06/05/homemade-silicon-carbide-led /

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On Wed, 6 Jun 2012 10:18:47 +0100, "gareth"

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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