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Hi William, in this instance it was a multi-tooth form relieved cutter but I do make and use fly cutters when needed
As for stock , most often it’s sheet , I rough it out on the band saw , drill and mount on the mandrel, then turn to correct o/d then cut the teeth, the set up is pretty true but I usually hold on the wheel teeth with soft jaws and bore true before crossing out and final mounting, just to be sure,
Sometimes I use bar stock , if I’m making ratchet wheels I cut the teeth on a fairly long bit of bar and part off a few spare to chuck in a drawer . . .
Hope that helps ‘