I watched a machinist friend turn down the fins on a ryobi fly wheel on the small 3x7 mini lathe from harbor freight. I didnt think it could be done. He sandwiched the part between two centers (tail stock). I would have found that hard to believe, but he did it. That just convinced me to go bigger. He also just bought 12x40 (I think) lathe from Grizzely. Its amazing what real machinist can do even with the cheap stuff. Hope to be that good someday. Practice practice practice.
Edwin