The accuracy inspection standards of CNC vertical lathes mainly include inspection of geometric accuracy, position accuracy and repeat positioning accuracy. The following are specific inspection standards and steps:

1. Geometric accuracy detection: This is the basis for machine tool accuracy detection. It mainly detects the geometric shape and mutual position accuracy of each component of the machine tool. For example, the flatness of the CNC vertical lathe work surface, the verticality of the movement axis spatial coordinates in different directions, the perpendicularity of the spindle center aperture and the rotary axis axis center line and the machine tool work surface, etc. These inspection items for CNC vertical lathes require the use of precision spirit levels, precision square boxes, dial indicators or micrometers, right angle meters, flat rulers and other inspection tools to ensure that the geometric accuracy of the machine tool meets the processing needs.

2. Position accuracy detection: CNC vertical lathes mainly detect the positioning accuracy, reverse deviation accuracy and repeat positioning accuracy of the machine tool. Positioning accuracy refers to whether the machine tool table or other moving parts reach the set motion position during actual operation and whether it is consistent with the programming instructions. The repetitive positioning accuracy of CNC vertical lathes is the control of the workpiece positioning error range during multiple repositionings, which should generally be controlled within 0.015-0.02mm.

3. Speed error and radial offset error: The standard for CNC vertical lathe speed error is generally 1-1.5%, while the radial offset error should be controlled within 0.02mm. These error values need to be controlled within a certain range to ensure the processing accuracy of the machine tool.

When performing accuracy inspection on CNC vertical lathes, it is necessary to carefully study the relevant manufacturing standards of the machine tools, and conduct inspections and measurements with reference to the corresponding standards. At the same time, the base of the machine tool should be completely solidified during testing, and the errors in testing tools and testing methods should be minimized. Preheating and trial operation should be carried out in accordance with relevant national standards before testing.

In short, the accuracy inspection of CNC vertical lathes is a complex and delicate process that requires professional knowledge and skills. Through scientific testing methods and strict standards, the processing accuracy and stability of machine tools can be ensured to meet various processing needs.