Chip Breaker bits and hardwoods

[waynec]

I'm trying to use a two flute chipbreaker bit on some hardwood at the recommendation of a tool supplier.

I've tried a recommended chip load of .015, with my spindle at 20K rpm and feed rate of 600 ipm, and my usual feed rate of 18K and 780 ipm. I get tool marks on the material at both. No burning, just really bad tool marks and alot of tool screeching.

Can someone recommend a starting point for cutting hardwood (maple) with a 1/2" chipbreaker?

Thanks

Wayne C
Its still a shopbot.

[knight_toolworks]

solid wood is best cut on the slower side. I seldom cut about 2ips with any bit. keeping the rpm's low helps the noise about 12k helps. but so far I have not found a quiet bit. roughers, straight, up or down cut can all be noisy in hardwoods. think maple is bad try purpleheart.