I agree with Ron, Thats the way i would do it. If your starting off with a square piece of metal and you want to mill it round you could chop saw the corners and make it into an octagon and then like Ron said bolt a bigger plate underneath to support and then use a rotary table or indexer to do the holes. The hole in the center looks like you would have to hand drill it if you don,t have a radial drill. |