On Mon, 12 Dec 2005 18:21:52 -0600, Rastus
wrote:

On Mon, 12 Dec 2005 18:32:16 -0500, Bob Chilcoat wrote:

These aren't cast iron any more;
they're apparently some sort of powdered metal. Hard -- high-speed tool
bits just rolled over and died. Fortunately, I had some carbide bits that
worked fine, but this stuff doesn't produce a nice curly chip.

Cast iron never produces a curly chip. However, you should
be able to cut it with HSS.

Never say never. :-)

Actually there's so many types of cast iron that this statement
isn't true. It depends on the cast iron type and heat treatment. I've
actually produced some pretty good sized curls in really good quality
cast iron. Cheap cast iron on the other hand will usually powder up.

Wayne Cook
Shamrock, TX
http://members.dslextreme.com/users/waynecook/index.htm