In article , DoN. Nichols says...

If you use carbide, don't use the TiN coated ones (or the other
coatings), as it results in a slight rounding (dulling) of the edge.
Good in working steel, but bad for composites.

He should purchase *one* tpg221 polycystaline diamond insert
from valenite. Unless he dings it accidentally, it will last
him literally forever turning phenolic.

Jim

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