I'm currently a student in a CNC machining program and a project we've been assigned is to make a socket for setting pull studs to the right torque spec, and our socket is being made out of 1144. To clean up the inside of the driver side of the socket, 1/8 endmill. It's a 4 flute uncoated solid carbide endmill and we are using a 5/8 long flute to avoid rubbing at the top of the drive when reaching the bottom of the drive which is 0.600 deep. I've turned 1144 before and I know it's really nice to machine, however with an endmill this small and long, I wanted to check with some more experienced machinists to ensure I don't break my endmill the second I start my cuts. I've done most of the roughing with a 1/4 endmill, but to finish I need to get in there with the 1/8. Currently, I've come up 9000rpm at 300sfm, .005 ipt, but with these numbers it comes out to like 180 ipm which just feels disgustingly fast. Does anybody have any suggestions or is that just how easy this material is to machine?