To reduce the processing errors of CNC vertical lathes, the following methods can be adopted:

1. Choose high-quality tools: Using high-quality tools for CNC vertical lathes can improve the accuracy and stability of processing. Choose cutting tools suitable for the material and processing requirements, ensure that the cutting tools are in good sharpening condition, and check and replace the cutting tools regularly.
2. Control the tool path and cutting parameters: CNC vertical lathe reasonably sets the cutting path and cutting parameters, including cutting speed, feed speed and cutting depth. According to material characteristics and processing requirements, select appropriate cutting parameters to avoid vibration and overload during the cutting process.
3. Optimize the process flow: CNC vertical lathe analyzes the processing process to find and optimize links that may cause errors. Reasonably arrange the process sequence and processing sequence to reduce the possibility of workpiece deformation and accumulated errors.
4. Strengthen the rigidity of machine tools: By increasing the rigidity and stability of CNC vertical lathes, the impact of the machine tool itself on processing errors is reduced. Use high-quality machine tool materials and appropriately increase the thickness of the bed and columns to enhance the stability of the machine tool.
5. Accurate measurement and calibration: Use high-precision measuring tools to measure workpiece dimensions and ensure the accuracy and stability of the measuring equipment. Regularly calibrate and adjust machine tools and measuring equipment to ensure their accuracy.
6. Stable working environment: Control the environmental conditions of the machine tool, including temperature, humidity and vibration. Providing a stable working environment can reduce the impact of external factors on processing errors.
7. Conduct employee training: Strengthen employee skills training and improve their proficiency in the operation and debugging of CNC vertical lathes. Familiar with the usage and precautions of machine tools, you can better control processing errors.
8. Regular maintenance and upkeep: Carry out regular maintenance and upkeep to ensure the normal condition of machine tools and cutting tools. Clean and lubricate machine tools, check and adjust various parameters of machine tools, find and solve problems in time, and maintain the stability and accuracy of machine tools.

Through the comprehensive application of the above methods, the processing errors of CNC vertical lathes can be effectively reduced and the processing quality and accuracy can be improved. However, specific measures should be evaluated and selected based on actual circumstances and needs to ensure their applicability and feasibility.