Thanks John, I have a book on order i hope it gets here soon. It an I&T book hope its a good one. I want to go to .125 if I don't have any trouble but I know from past experience when you go to the top end on boring you can have all kinds of heating problems. Nice to know that I shouldn't on this one. Walt Davies Cooper Hollow Farm Monmouth, OR 97361 503 623-0460