The accuracy acceptance criteria of CNC vertical lathes are usually determined by manufacturing standards, specifications or customer requirements. The following are some common CNC vertical lathe machining accuracy acceptance criteria:

1. Dimensional accuracy: Dimensional accuracy is usually expressed by tolerance or dimensional deviation.
2. Surface quality: The evaluation of surface quality is usually measured by roughness parameters, such as Ra, Rz, etc. Specific surface finish requirements and roughness standards can vary by industry and application.
3. Axial accuracy: Axial accuracy involves the straightness and roundness of the axis. It is usually measured by the maximum allowable axial deviation, and different standards and tolerance levels can be selected according to specific requirements.
4. Angle accuracy: Angle accuracy involves the angle size and consistency of the processed parts. Angular accuracy requirements can be assessed using angular tolerances.
5. Parallelism and perpendicularity: For parts that require parallel or perpendicular processing, parallelism and perpendicularity can be used as measurement parameters. Depending on the specific requirements, different standards and tolerance classes can be selected.

Please note that the selection of accuracy acceptance criteria should be determined according to the design requirements of the part, the use environment and the application scenario. In practical applications, the corresponding standards and specifications are usually agreed upon with the manufacturer or customer and followed. For applications in special industries or high-precision requirements, more stringent industry standards or customer requirements may need to be followed.