The spot check of CNC machine tools is the basis for the work of condition monitoring and fault diagnosis, which mainly includes the following contents:

① Fixed point. First of all, it is necessary to determine how many maintenance points a CNC machine tool has, analyze the equipment scientifically, and find out the possible failure parts. As long as these maintenance points are “watched”, faults will be found in time.

② Calibration. Standards shall be formulated for each maintenance point, such as clearance, temperature, pressure, flow, tightness, etc., with clear quantity standards, so long as it does not exceed the specified standards, it is not a fault.

③ On a regular basis. How often do you check it? Set the inspection cycle. Some points may be inspected by boat class, and some points may be inspected once a month or a month, which shall be determined according to the specific situation.

④ Fixed item. The items to be checked at each maintenance point shall also be clearly specified. A boat may check one item or another.

⑤ Set people. Who is responsible for the inspection? The operator, maintenance personnel or technical personnel? The personnel shall be assigned according to the parts and technical accuracy requirements of CNC machine tool inspection.

⑥ Determination. There should also be regulations on how to check, whether to observe manually or measure with instruments, whether to use ordinary instruments or precision instruments.

⑦ Check. The inspection environment and steps shall be specified, including inspection during production and operation, shutdown inspection, disassembly inspection or non disassembly inspection.

⑧ Record. The inspection shall be recorded in detail and filled in clearly according to the specified format. The inspection data and the difference between the inspection data and the specified standard, the judgment impression and the handling opinions shall be filled in. The inspector shall sign and indicate the inspection time.

⑨ Processing. If the inspection can handle and adjust the V in the middle, handle and adjust it in time, and record the processing result in the processing record. If there is no ability or condition to deal with it, it shall be reported to relevant personnel in a timely manner and arranged to deal with it. But any person and any time should fill in the processing record.

⑩ Analysis. The inspection records and processing records shall be systematically analyzed on a regular basis to find out the weak “maintenance points”, that is, the points with high failure rate or the links with large loss, put forward opinions and submit them to the designer for improvement. The spot check of CNC machine tools can be divided into two levels: daily spot check and full-time spot check. The routine spot check is responsible for the spot check, treatment and inspection of the general parts of the machine tool, as well as the failure of the machine tool in the operation process, which shall be carried out by the machine operator. The full-time spot check is responsible for the key parts and important parts of the machine tool to carry out the key spot check and equipment condition monitoring and fault diagnosis according to the cycle, making the spot check plan, making the diagnosis record, analyzing the maintenance results, and putting forward suggestions for improving the equipment maintenance management, which shall be carried out by the full-time maintenance personnel. As a work system, the spot check of CNC machine tools must be carried out carefully and persevered to ensure the normal operation of the machine tools