On Sat, 6 Aug 2005 10:54:07 -0700, "Harold and Susan Vordos"
wrote:

I still suggest your problem is the wrong grade of
carbide-----the symptoms you discuss are hand in hand with what I'd expect.
You're experiencing tip failure,

One would expect such problems to get worse with time,
not start at once.

or you simply don't have the proper relief.

It's an ID cut ..... how far above center must he be
with that insert?
We don't know the diameter of the ID yet ...

Personally, I'd probably use an insert/toolholder
that would clear on center at that DOC & diameter.....
--
Cliff