I have some 3/8 dia injection mold ejector pins that i need to square off the ends, and I would like to use my CNC to do this, so they are nice and flat on the end verses trying to do it on a bench grinder.

Just curious if a standard 3/16 or 1/4 end mill would work since the pins are made with hardened steel.

The list the material as H13 tool steel ( Rockwell C41 )

I would use a bench grinder to get the length in the ball park, and then use the CNC to get them cleaned up to length.

Second question... if I can use the CNC would I be better to use the side of the end mill for cutting them.... or the bottom of the end mill.... or doesn't it matter?

I don't have a lathe, so that's why I'm not going that route.

If I can use a CNC, any ball park starting recipe for the feeds and speeds would be appreciated.

Thanks,

Kent