A geometric error measurement method for five-axis ultra-precision machine tools

To solve the problem of geometric error measurement for five-axis ultra-precision machine tools in interpolated five-axis motion, a measurement method based on the double ballbar (DBB) is proposed in this paper. The method proposed in this research can measure the geometric errors of five-axis ultra-precision machine tool through only one-time installation, and the new method is less limited by the layout of machine tools. The motion trajectory is designed, and the length of the DBB remains constant during the measurement process to achieve the measurement of the geometric errors. Furthermore, the measured results are compared with the theoretical results of the error model. It is found that the trend and the amplitude of the measurement results are in agreement with the theoretical results. It is proved that the method can measure the geometric errors of five-axis ultra-precision machine tool effectively.