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Received: 18 March 2020 Accepted: 27 May 2020 The accuracy of swing angle directly bears on the machining performance of computer numerical control (CNC) machine tools. Any error in the swing angle will greatly affect the machining quality. In actual engineering, it is very important to compensate for the angle error in the machine tool. This paper attempts to design an effective method to compensate for the swing angle error in special-shaped rock turning-milling machining center HTM50200. Firstly, the commonly used swing angles of the tool axle were measured, and fitted into curves through polynomial regression. Based on the fitted curves, the error between the theoretical and actual swing angles was obtained and corrected, and the change law of the angle error was derived. After error compensation, the actual swing angle was measured again for verification. According to the measured results, our error compensation technique greatly enhanced the rotation accuracy of the swing axle, and mitigated the effects of swing angle error on machining accuracy. This research breaks new ground for the development of high-end high-precision rock machining equipment.

Swing Angle Error Compensation of a Computer Numerical Control Machining Center for Special-Shaped Rocks