To improve the accuracy of the machine tool, the following methods can be adopted:

1. Purchase high-precision machine tools: When purchasing machine tools, choose high-precision machine tool models and brands. These machine tools typically feature high-quality materials and advanced manufacturing processes that provide greater mechanical stability and accuracy.
2. Regular calibration and adjustment: Regular calibration and adjustment of the machine tool is the key to maintaining the accuracy of the machine tool. Perform pinpoint positioning, pinpoint circle determination, and other calibration operations according to the manufacturer's recommendations. Use professional calibration tools and instruments, such as block gauges, squares, parallels, etc., to ensure the accuracy and stability of the machine tool.
3. Lubrication and cooling system: The lubrication and cooling system of the machine tool is critical to maintaining accuracy. Ensure that the quality and concentration of lubricating oil meet the requirements, and the oil filling point is unobstructed to avoid insufficient lubrication or contamination. It is also important to keep the cooling system running properly to avoid overheating and temperature changes from affecting the accuracy of the machine tool.
4. Tool selection and tool management: Choosing the right tool is crucial to achieve high-precision machining. Select tool material, tool geometry and tool size according to machining requirements. And ensure that the tool is of good quality and free of damage, and that it is regularly inspected and replaced during use.
5. Cutting parameters and processing strategies: Correct cutting parameters and processing strategies help to improve processing accuracy. Reasonable selection of cutting speed, feed rate and depth of cut to avoid excessive or small cutting volume. Optimize machining strategies such as proper toolpaths, cutting directions, and clamping to reduce vibration and machining errors.
6. Maintenance and maintenance: Regular maintenance and maintenance of machine tools, including cleaning and lubricating moving parts, tightening screws, calibration and adjustment, etc. Keeping the various components and systems of the machine tool in good condition can ensure the stability and precision of the machine tool.
7. Operator training and operating procedures: Operator training and compliance with operating procedures are critical to maintaining machine tool accuracy. Make sure that the operator understands the correct method of machine tool operation, pays attention to the details of the operation, improves the operation skills, and avoids the influence of human factors on the accuracy of the machine tool.

To sum up, taking the above measures can improve the accuracy of the machine tool. However, the corresponding method needs to be selected and implemented according to the characteristics and requirements of the specific machine tool. In addition, constant attention to new technologies and advanced processing methods also helps to improve the accuracy and processing capabilities of machine tools.