As the reliability of modern numerical control system is higher and higher, the fault of the numerical control system is lower and lower, and most of the faults are caused by the setting of system parameters, the quality of the servo motor and drive unit, as well as the problems of strong electrical components and mechanical protection.

The equipment debugging and the customer maintenance service are the two multi-occurrence stages of NC equipment failure. The equipment debugging stage is the stage of designing, compiling PLC, setting, adjusting and optimizing the control system of NC machine tool. The user maintenance service stage is the further examination of the strong electric component, servo motor and drive unit, and mechanical protection. The following are several examples of debugging and maintenance of CNC machine tools:

Case 1 a NC lathe with FAGOR 8025 control system, X, Z axis using half closed loop control, after running for half a year in the user find the Z axis every time back to the reference point, there are 2, 3 mm error, and error, and adjusting parameters of control system is still not disappear, after the replacement of servo motor phenomenon still exists, then after careful analysis, estimation is screw end no tight, disappear after nut for the phenomenon.

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