Reply to "TiN drill bits"

FfffredddOGR Forum Member

If your bits are grabbing in brass, then your speed and or modeled are wrong.

Brass/ copper usually grabs because you are heating the hole. It may be counterintuitive but if you heat a pipe, the outside gets bigger but the inside gets smaller.
Nothing wrong with using a zero or negative rake but you are now scraping and not drilling.
They are great for acrylic and polycarbonate. Acrylic grabs and shatters. Polycarbonate usually just grabs and melts.

Use a good quality cutting fluid. Too bad the Original AlumaTap is no longer available. 111trico was a great cutting fluid for alum, brass and copper.
And yes, I know it is a carcinogen. But only in the State of California. LOL.

11/8/137:33 AM

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