Group,
Has anyone ever done any pinch turning, and what was the longest length and smallest diameter? By pinch turning I mean two turrets simultaneously turning at once. The challenge I have before me is .875 diameter x 44 inches long. No steady rest, tailstock only. I think the best approach will be roughing with the top turret and finishing with the bottom turret. The key to equalizing pressure will be to split the difference between the stock size 1 1/8 hex and the finish size .875. (1.3-.875)/2 = .2125. So I would be roughing and finishing with a .2125 depth of cut. I think the finisher should follow the rougher as close as possible say .01. The machine has a Y axis so I can adjust tool center line if needed to control deflection. The material is 316 stainless. Does anyone that has done it foresee any potential problems with the above set up?
Thanks in advance