The inaccurate accuracy of CNC vertical lathe tool holder may involve multiple factors. The following are some possible reasons and corresponding processing methods:

1. Problems with the machine tool itself:

Reason: There is a problem with the structure or guide rail of the machine tool, causing the tool holder to move unstable.

Treatment method: Regularly inspect and maintain the machine tool structure, ensure the cleaning and lubrication of the guide rails, and repair or replace damaged parts.

2. Problems with the cooperation between the tool holder and the guide rail:

Reason: The fit between the tool holder and the guide rail is poor, and there may be gaps or friction problems.

Solution: Adjust the fit between the tool holder and the guide rail to ensure proper clearance and lubrication. Replace damaged guide rail or tool holder parts if necessary.

3. Screw transmission problem:

Reason: If the lifting and lowering of the tool holder is realized by screw transmission, the wear or looseness of the screw may cause inaccurate lifting.

Solution: Check the condition of the screw to ensure it is well lubricated and tightened. Replace worn screws if necessary.

4. CNC system problems:

Reason: The program or parameter settings of the CNC system may be incorrect.

Treatment method: Carefully check the program and parameter settings of the CNC system to ensure that they meet the processing requirements. Relevant motion parameters may need to be adjusted.

5. Tool installation issues:

Reason: The tool installation is unstable or incorrect.

Solution: Make sure the tool is installed correctly and check the stability of the clamping system. Replace damaged tools or fixtures if necessary.

6. Abrasive tool problems:

Reason: If grinding tools are involved, grinding tool wear or incorrect grinding can result in inaccurate toolholder accuracy.

Treatment method: Check and replace the grinding tools regularly to ensure that they are worn evenly and meet specifications.

When dealing with the problem of inaccurate tool holder accuracy, it is recommended to conduct systematic inspection and maintenance based on the specific situation. It is best to follow the maintenance manual and technical specifications provided by the machine tool manufacturer to ensure the normal operation and accuracy of the machine tool. If the problem cannot be resolved, professional service personnel may be required to intervene.