In the machining process of shaft parts, in order to avoid the problem of excessive errors, the following aspects need to be paid attention to: 1. Tool errors: Geometric errors and wear errors of the tool can both affect the accuracy of the machined parts. To reduce this error, it is necessary to choose appropriate tool materials and geometric parameters, install the tools correctly, regularly check the wear of the tools, and replace severely worn tools in a timely manner. 0002. Machine tool errors: Manufacturing errors, guide rail errors, and transmission chain errors of machine tools may have a significant impact on machining accuracy. Therefore, it is necessary to regularly maintain and calibrate the machine tool to ensure that it is in good working condition. Meanwhile, during the machining process, the cutting amount should be reasonably selected to reduce the wear of the machine tool. 3. Process system error: The process system includes workpieces, fixtures, cutting tools, etc., and its error can also affect the accuracy of the processed parts. To reduce this error, appropriate fixtures should be selected to ensure the clamping accuracy of the workpiece; Correctly install the workpiece to ensure its accuracy and stability; And choose cutting parameters reasonably to reduce tool wear. 4. Dimensional error: Axial parts are prone to dimensional accuracy deviation during the turning process. To avoid this situation, it is necessary to carefully read the drawings, master the use of the feed dial, and see the number of scales clearly; Calculate the cutting depth based on the machining allowance, conduct shallow trial cutting, and then correct the cutting depth; Before using measuring tools, it is necessary to carefully inspect and adjust the parts, and use the measuring tools correctly; Cannot measure when the workpiece temperature is high, wait until the temperature drops to room temperature before proceeding. In addition, some specific error reduction methods can be used, such as directly reducing the original error method, error transfer method, and error grouping method. These methods can be selected and applied according to specific processing conditions and requirements.