[George C]

I've cut treads on Colsons a few times using a dividing head with a three jaw chuck on a horizontal mill. Bolt the dividing head on an angle across a couple of t slots, put a piece of hex shaft in the chuck, use a hex shaft collar to hold the wheel on. The angles aren't critical. I cut every 15 or 20 degrees, use a 1/8 slit saw, high speed and feed and cut both directions. Do all your wheels at one angle and then move the head to get the other angle for a diamond pattern.