"Terry" wrote in message
ps.com...
The company we purchase them from can machine them, but the lead times
are very long and we just can't wait. They did say we should use
diamond tooling, but I have not seen any diamond coated turning
inserts. I will have to look a bit more.

Look them up on Google. They've been around for some years now. I was
writing articles about them back in the '90s.

--
Ed Huntress