In article , Gunner says...

On 18 Oct 2003 09:58:03 -0700, jim rozen
wrote:


If this grind is done with back angle, then the
cutting tool has both side, and back rake as
well. Many folks feel that back rake is essential
to good cutting, I've never found that to be true.

If you make a sharp rake angle and keep it very short, it works as a
modereatly decent chip breaker. I often do this and make it deep and
keep the rake area only about 3/16" long at most.

If I want a chip breaker, I take the geometry I mentioned,
and put a narrow groove across the tool, a tiny bit in back
of the edge. No longer easily sharpenable, though.

Jim

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