This paper proposes a new method to measure and identify the squareness errors of machine tools considering the volumetric accuracy based on the volumetric error model. The volumetric error model based on screw theory is proposed, and then the identification method for the squareness errors is deduced in theory considering a 3-axis horizontal machine tool. Experiments with the measuring method and other traditional measuring methods have verified that the three identified squareness errors follow the measured squareness within the accuracy range. Moreover, the six face diagonal errors are calculated with the identified squareness errors and other squareness errors in different methods compared with the measured face diagonal errors. It shows that compared with the traditional measurement of squareness errors, the proposed method shows more effectiveness in the volumetric error evaluation process.

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X. Zhong, H. Liu, H. Chang, B. Li, “An identification method of squareness errors based on volumetric error model in machine tools” International Journal of Technology and Engineering Studies, vol. 4, no. 4, pp. 132-142, 2018.