grantmi1,
My experience is with Ingersoll cutting tools. Based in that I used 1250 rpm,20 ipm feed, and .300 depth 75% diameter.
If I remember correct material was 4140. I know is a lot different than 420, but I get those numbers from the Ingersoll salesman
any chance you can call the sales dept. from walkasa?.
GOMEZ107 |