In order to prevent damage to the CNC vertical lathe spindle, the following measures can be taken:

1. Correct tool selection and installation: select the appropriate tool type, size and material, and ensure correct installation and clamping. Using the right tool will reduce load and damage to the spindle.
2. Reasonable cutting parameters: According to the processing material and workpiece characteristics, select a reasonable cutting speed, feed rate and cutting depth. Excessive cutting parameters will increase the spindle load and may cause spindle damage.
3. Regular lubrication and maintenance: regular lubrication and maintenance of the main shaft and bearings. According to the machine tool manufacturer's recommendations, use suitable lubricants and carry out lubrication maintenance according to the specified cycle.
4. Avoid overload and collision: avoid unstable workpiece clamping, collision, overload and other situations. Through reasonable process planning and operation control, ensure that the spindle runs within the normal load range.
5. Operate in strict accordance with the operating procedures: the operator should receive professional training and operate the CNC vertical lathe in strict accordance with the operating procedures. Ensure the correct operation steps and operation sequence to avoid damage to the spindle caused by human factors.
6. Regular inspection and maintenance: Regularly check the wear of the main shaft and related bearings, and repair or replace them in time if any abnormalities are found. Regularly check the parameters and operating status of the spindle system to ensure the normal performance of the spindle.
7. Reasonable load distribution: In the processing process, try to avoid long-term high-load operation. If necessary, the processing sequence can be reasonably arranged to carry out load decomposition.

The above measures can help reduce the risk of damage to the CNC vertical lathe spindle and prolong its service life. At the same time, please refer to the maintenance suggestions and guidance provided by the manufacturer for operation and maintenance according to the instructions and user manuals of the specific CNC vertical lathe.