I have a set of Ray Iles thread chasers, and they work good, but only on woods dense enough to cut a thread without chipping. If you want to thread woods like walnut, cherry, maple, etc. and don't want to spend a lot of money, make a jig that works on both the dense and not so dense woods. Dick Mahany posted some pics of one he built;http://www.sawmillcreek.org/showthre...t=#post1207644 and with his gracious help I built one myself. Works great and cost around $100.00, or less.