A Study on the Motion Accuracy of NC Machine Tools (3rd Report)

The Influence of Servo Control Components to the Motion Error

Abstract

The influence of servo control components has been studied to the motion error of NC machine tools by using double ball bar test. The motion errors generated by servo components error, were theoretically analyzed. The DBB measurements were conducted with using many NC machine tools to obtain error motion while they were driven at different feed rates and different time constants. These measured error motions were compared with those obtained theoretically. The results show that out-of-roundness error, radius decreasing error, step and peak error at the quadrant change, and higher harmonic component's error were intimately related with the servo control components errors.