CNC machine tools are one of the core equipment of modern manufacturing industry, and their accuracy and stability have a vital impact on the quality of the products produced. However, in the actual production process, dimensional instability is often encountered, which not only affects the quality of the product, but also causes great trouble to production.

When CNC machine tools encounter dimensional instability, the following measures should be taken:

1. Check the geometric accuracy of the machine tool: Geometric accuracy is one of the key factors affecting the machining accuracy of CNC machine tools, including the accuracy of the machine tool's guide rails, spindles and other parts. If problems with geometric accuracy are found, adjustments and repairs should be made in time to ensure the processing accuracy of the machine tool.

2. Check the wear of the cutting tools: The wear of the cutting tools is also one of the causes of dimensional instability. During the machining process, the wear of the cutting tools should be checked regularly, and seriously worn tools should be replaced in time to ensure the dimensional accuracy of the processing.

3. Control cutting parameters: Cutting parameters are another important factor affecting the dimensional accuracy of processing. During the machining process, cutting parameters, such as cutting speed, feed speed, and cutting depth, should be reasonably selected according to different materials and tools to ensure the stability of the machining dimensions.

4. Improve the clamping accuracy of the workpiece: The clamping accuracy of the workpiece is also one of the factors that affects the dimensional accuracy of processing. When clamping the workpiece, appropriate fixtures and clamping methods should be selected to ensure that the position and attitude of the workpiece are stable to improve the stability of the processing dimensions.

5. Regular maintenance and upkeep: Maintenance and upkeep of CNC machine tools are also important measures to ensure the dimensional stability of their processing. Comprehensive inspection and maintenance of machine tools should be carried out regularly, including cleaning, lubrication and adjustment, etc. to ensure that the machine tool is in good working condition.

When a CNC machine tool encounters dimensional instability, it should be checked and adjusted from multiple aspects to ensure the stability of the processing dimensions. Only by ensuring the processing accuracy and stability of CNC machine tools can we produce high-quality products and improve the competitiveness of enterprises.