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介绍一种测量数控机床和加工中心运动误差的装置——双频激光干涉仪的特点、测试原理及测量方法，并结合数控铣床的精度测量，给出丝杆螺距正、反向误差补偿的具体计算方法。
This paper introduces a device to measure the movement error of CNC machine tool and machining center - the characteristics, test principle and measuring method of dual frequency laser interferometer. Combining with the precision measurement of CNC milling machine, this paper gives the specifics of screw pitch positive and reverse error compensation Calculation method.