Abstract
Several methods to evaluate the motion accuracy of the rotary axis of 5-axis machining centers have been proposed and attracts attention. However, the influence by the translational axes is included in an evaluation result because the translational axes turn over at the motion direction changing point of the rotary axis in a general simultaneous motion of the rotary and translational axes. In this study, a measurement system to evaluate the dynamic characteristics of rotary axis around the motion direction changing point which can eliminate the influence of translational axes is developed. In addition, it is confirmed by the actual machining tests that the influence of tracking error on the machined surface is related with the size/shape of the tools and geometrical relationships between the tracking error and the machined surface.
