Not knowing much about lathes, I asked the lathe operator at my previous place of employment about turning rotors on an engine lathe (not that I wanted him to do mine, just curious). He said that the old timer, who taught him, said not to turn rotors on anything but a brake lathe. What's the difference? I worked in a garage when I was a teen, and I saw how rotors were turned. The only real difference I saw was that they put a rubber strap around the outside to keep the squealing down, and that they had mounting cones for automatic centering. Other than the swing being an issue, why couldn't a rotor be turned on an engine lathe?