When using CNC machine tools, you need to pay attention to the following important matters:

1. Safe operation: Follow the operating manual and safe operating procedures provided by the machine tool manufacturer. Familiar with the location and function of the machine's operator control panel, safety devices and emergency stop buttons. Make sure operators have the necessary training and qualifications and wear appropriate personal protective equipment such as safety glasses, gloves, and earplugs.
2. Programming and setting: The operation of CNC machine tools needs to be programmed and set. Make sure to program with accurate tool parameters, coordinate positions and process parameters to avoid misuse and component damage. The correctness of the program is carefully checked and verified, and simulation software can be used for rehearsal to ensure that there are no errors or conflicts.
3. Workpiece and Fixtures: Use proper workpiece fixtures for clamping to ensure the safety and stability of the workpiece. Check to make sure the workpiece is properly clamped and check that the clamp's fastening screws are tight. Avoid machining oversized or heavy workpieces on the machine tool that exceed its load capacity.
4. Tool selection: Select the appropriate tool according to the processing requirements. Make sure the knives are of good quality and replace and adjust as needed. Use the correct tool parameters and cutting data (such as cutting speed, feed rate and depth of cut, etc.) to ensure processing quality and tool life.
5. Cooling and lubrication: ensure the normal operation of the lubrication and cooling system. Maintain a proper supply of oil or lubricant and ensure that the circulation and temperature of the coolant is well controlled. Clean and replace the filter screen and filter element in the cooling system in time to prevent the cooling system from clogging and overheating.
6. Regular maintenance: Carry out regular machine tool maintenance and maintenance. Check for wear and looseness of machine tool components such as lubrication systems, guideways, spindles, and drive trains. Replace worn parts in time, and lubricate and clean according to the maintenance schedule.
7. Monitor the processing process: stay vigilant during the processing process, and pay attention to observe the operation and processing status of the machine tool. Make sure that the machining process is smooth and there are no problems such as abnormal vibration, noise or overheating. If a problem is found, stop the machine immediately for inspection and contact professional maintenance personnel or technical support.

It is important to remember that each CNC machine tool may have specific operating requirements and precautions, so the operating manuals and guidance documents provided by the machine tool manufacturer should be carefully read and followed. If you have any questions or need further operation guidance, it is recommended to consult professional technical support or the technical team of the supplier.