Abstract
In this paper, NC data for three-dimensional circular movement under simultaneous five-axis control were prepared by using a CAM software and a theoretical method, and the velocity changes of the NC data were precisely investigated. Then, using the simulator of five-axis machines, trajectories were compared. It is found that higher feed rates are limited to avoid rapid change in velocity in the NC data produced by the CAM and, as the result, the trajectories are affected by the feed rates programmed.
