The development speed of CNC system of modern CNC machine tools is changing with each passing day, the system work is more and more stable and reliable, and the failure rate of the system itself is getting lower and lower. However, the control system must establish the coordinate system before starting the machine tool, that is, the control mode of executing the mechanical zero point is unchanged, and the machine tool Detecting the working principle and structure of the zero return switch (with and without contacts)
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