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分析了数控机床回机械零点重复定位精度不高的原因，提出一种采用硬、软件相结合控制实现精确返回机械零点的方法，给出相应程序流程图，对提高数控机床的定位精度具有实用参考价值
This paper analyzes the reasons why the precision of machine tool zero point repetitive positioning is not high, and presents a method of using hardware and software to control the precision returning mechanical zero. The corresponding program flow chart is given, which has practical reference to improve the positioning accuracy of CNC machine tools value