Common lathe processing faults (1) Power supply The power supply is the energy source for the normal operation of the maintenance system and even the entire machine tool. Its failure or failure will lose data and cause downtime. The heavy will destroy the system partially or even completely. Western countries have sufficient power and high quality power grids, so the power supply design of their electrical systems is less considered, which is slightly insufficient for the power supply network with large fluctuations and high harmonics in our country. Coupled with some artificial factors, it is inevitable that the failure caused by the power supply will occur. (2) Position ring failure of numerical control system (3) Coordinate machine tool cannot find the zero point. It may be that the zero direction is far from the zero point; the encoder is damaged or the wiring is open; the zero mark of the grating is shifted; the return to zero deceleration switch fails. ( 4) The dynamic characteristics of the machine tool deteriorate, the processing quality of the workpiece decreases, and even the machine tool vibrates at a certain speed. One of these may be caused by excessive clearance or even severe wear of the mechanical transmission system or insufficient lubrication or even wear of the guide rail; for the electrical control system, it may be that the speed ring, position ring and related parameters are no longer in the best matching state, and should be re-optimized after the mechanical failure is basically eliminated. (5) Occasional shutdown failure. There are two possible scenarios here: one is that the problem in the relevant software design as mentioned above causes the shutdown failure under some specific operation and function operation combination, and generally the machine tool will disappear after re-powering after power failure; the other is caused by environmental conditions, such as strong interference (power grid or peripheral equipment), excessive temperature, excessive humidity, etc. This environmental factor is often overlooked by people, such as the southern region where the machine tool is placed in an ordinary factory building or even close to the open door, the electric cabinet is open for a long time, and there are a lot of dust, metal chips or water mist-generating equipment nearby. These factors will not only cause failure, but also seriously damage the system and machine tool. It is necessary to pay attention to improvement. The summary and improvement work after maintenance and troubleshooting is the third stage of troubleshooting, and it is also a very important stage, which should be paid enough attention to.