Abstract
Based on the fact that conventional cutting can not avoid the circularity error which is caused by cutting a deformed workpiece held by three-jaw power chuck, this paper describes three methods to compensate the circularity error using an NC lathe with the tool post driven by PZT to trace the surface of the deformed workpiece so that the resultant cut geometry becomes an ideal one after unclamping. The developed methods can realize a constant depth of cut for the deformed workpiece, during cutting by using the prediction by FEM and/or the measured data of circularity. The predicted data are accurate enough to use as the control input to drive the tool post and the results obtained by using developed apparatus showed the improvement of roundness up to 80% with respect to the component of the three undulations per revolution.
