Ok, I will admit that I have next to no machine background. Everything I learned was from here or watching and listening, or just trying it myself. but I have ben doing that for the past 3 years.
So Here's the problem, I can't get carbide end mills to last in steel. Right now I have a part I am trying to make and I just can't seem to get the em's to last. Material is 1045, 1.625 dia round stock. I need to mill a flat on the end of the stock to half the dia and 1" back. I am starting with a 4fl carbide rougher (uncoated) and finishing with a 4fl carbide uncoated finisher. I started at around 480sfm and .002 per tooth at .050 deep flood coolant. That chipped the edge of the tooth. so I stepped back and slowed down a little, 275 sfm and .0015 per tooth, still sounds bad, so I thought I had too much steppover, and reduced to .120, and upped the doc to .12. Still sounds bad...
Can someone please enlighten me on where I should start with speed, feed, and doc? What about coolant?
Oh, machine is a Millport bed mill 5hp spindle with a centroid control.