The spindle orientation adjustment and diagnosis methods of CNC machine tools mainly involve the following aspects:

Adjust spindle orientation:

1. Check the spindle bearing: CNC machine tools first need to check whether the spindle bearing is normal and ensure that it is not damaged or severely worn. If there is a problem with the bearing, it needs to be replaced in time.

2. Adjust the axial clearance: If there is axial clearance in the CNC machine tool spindle, it may lead to inaccurate spindle orientation. The axial clearance can be reduced by adjusting the bearing preload or replacing the bearings.

3. Check the spindle installation: Make sure the CNC machine tool spindle is correctly installed in the spindle box, whether the bearings and positioning components are firmly installed, and whether there is any deformation or damage.

4. Correct the spindle positioning: CNC machine tools can correct the spindle positioning through special tools or equipment to ensure that the axial, radial and angular orientation of the spindle meets the requirements.

Diagnosing spindle orientation problems:

1. Check bearing wear: If the CNC machine tool spindle bearing is severely worn, it may lead to inaccurate spindle orientation. You can judge whether the bearing needs to be replaced by observing the noise, temperature and vibration of the bearing.

2. Check the spindle assembly: If the CNC machine tool spindle is installed incorrectly or is deformed, it may cause inaccurate spindle orientation. This problem can be eliminated by checking the installation of the spindle and spindle box.

3. Measuring positioning accuracy: CNC machine tools use measuring instruments (such as laser measuring instruments, micrometers, etc.) to measure the positioning accuracy of the spindle to determine whether it meets the required accuracy standards.

4. Analyze the processing quality: If there are problems with the size, surface quality, etc. of parts processed by CNC machine tools, it may be due to inaccurate spindle orientation. CNC machine tools diagnose whether there are problems with spindle orientation by analyzing machining quality.

When adjusting and diagnosing the spindle orientation of CNC machine tools, you need to pay attention to safety and choose appropriate methods and tools according to the specific situation. When you are not sure how to operate, it is best to ask professionals or the manufacturer's technicians to adjust and diagnose.