Vibration problems during CNC vertical lathe processing may be caused by many reasons. Here are some possible solutions:

1. Stabilize the cutter and tool holder: Make sure the cutter and tool holder are installed correctly and securely. Use proper clamping tools and correct tool installation procedures to prevent tool vibration during machining.

2. Optimize cutting parameters: adjust cutting parameters, including cutting speed, feed speed and cutting depth. Make sure these parameters meet the machining requirements of the material and avoid using cutting parameters that are too large or too small.

3. Balance the workpiece: If the workpiece is unbalanced, it may cause vibration. Make sure the mass of the workpiece is evenly distributed, or consider adding counterweights to the workpiece.

4. Check the workpiece clamping: Make sure the workpiece is clamped firmly to avoid movement during processing. Use appropriate clamping tools and regularly inspect clamping devices for damage or wear.

5. Check tool wear: Check the tool wear regularly and replace severely worn tools in a timely manner. Severely worn tools can easily cause vibration and affect processing quality.

6. Calibrate the CNC system: Ensure that the parameters and calibration of the CNC system are accurate. Errors can lead to unstable machining processes.

7. Adjust the tool offset: Adjust the tool offset appropriately to ensure that the contact point between the tool and the workpiece is at the appropriate position. Incorrect tool offset can lead to unstable cuts.

8. Check the machine tool structure: Regularly check the machine tool structure of the CNC vertical lathe, including the bed, guide rails, spindle, etc. Loose or damaged machine tool structures can cause vibrations.

9. Reduce the feed speed: If vibration mainly occurs at certain stages of the machining process, consider reducing the feed speed to reduce cutting forces.

10. Use shock-absorbing tools: Use shock-absorbing tools, such as shock-absorbing pads or shock-absorbing fixtures, between the machine tool and the workpiece to help absorb vibration.

If the above methods cannot solve the vibration problem, it is recommended to seek professional technical support or contact the CNC vertical lathe manufacturer. They may be able to provide more detailed analysis and solutions. If you have further questions or need more detailed information about vibration issues during CNC vertical lathe machining, please provide more context or a specific description of the problem and I will do my best to help.