Harold and Susan Vordos wrote:
Carboloy 883. 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, or you simply don't have the proper relief.

The following:
http://www.mitsubishicarbide.com/EU/...dimple_bar.pdf
suggests NX2525 as FIRST CHOISE for mild steel, WITH FS BREAKER.

So, it is not wrong grade, and FS is also for steel.

Kristian Ukkonen.