I am cutting a groove .010 deep in hardened A-2 55-57 r/c.

What is a good brand of endmill & what speeds & feeds.

Thanks

Robbjack makes excellent mills for theses types of applications.
here (http://www.hardmilling.com)
You want to start at about 600-800 sfm.

PEACE:D

A big help, and fast response too!

Thanks