When the length scale of the CNC lathe machine is unstable, you should first confirm whether the origin of the lathe is correct. Under the premise of correct origin, check the following aspects:

1. Z-axis screw reverse clearance compensation is not in place or the lead rod wears out;

2. The tool is not clamped or is too fragile;

3. There is a problem with the programming process road;

4. The fixture is not worn or clamped in place;

5. The unstable pressure causes the clamping to be unstable;

The basic length instability is caused by the above five factors, and the comparison can be checked.

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