I know it's not the same but maybe it will help. I use 1/16 ball for engraving and i run it at 5100rpm, 7ipm plunge and 10ipm feed at .005 - .008" depth depending on what it is. So if I were to do it and i'm not saying it's correct, I would run it at 5ipm feed and work my way up to 7 to 10.