Hope this is the correct place to post this.... I am working on some 2 stroke pistons and they location pin for the rings. I want to mill them out and relocate them. The problem is they are very small around 1/16" hardened pins and about .600 long. I have broken two 1/8" 4 flute end mill that are TiAIN coated with a spindle rpm of 1,100 with very light pressure. They seem to "grab" and then break. I am having to mill off center to keep from milling the ring groove too much. Can someone steer me in the right direction of what I need to do this correctly? I would appreciate the help. Thanks to all that reply.