The prototype measurement device previously developed by the authors for evaluating the motion accuracy of NC machine tools failed to achieve the required measurement accuracy. Insufficient rigidity in specific structural components was considered a primary factor contributing to reduced accuracy. In this study, modifications were implemented with an emphasis on increasing the structural rigidity of the device. The effectiveness of these modifications was evaluated by conducting circular motion tests. Measurement results before, after the modifications and double ball bar (DBB) were compared evaluate the performance. As a result, the trajectory errors due to backlash and quadrant glitches in the (+) and (-) directions of the X axis and the (+) direction of the Y axis, confirmed by the measurement results of the improved prototype measurement device and DBB, were generally consistent. However, there are still differences in the measurement results between the improved prototype measurement device and DBB, and more improvements are necessary.
Okawa et al. (Wed,) studied this question.