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What's wrong with the pointer jumping during honing?

The reasons for pointer jumping during honing are as follows:

1, the pinhole at the top of the workpiece appears ellipse.

2. The top pinhole is rough.

3. Excessive wear of thimbles on both sides leads to workpiece jumping.

Solution:

1. Finish the top pin hole of the workpiece.

2. The grinding and repairing of thimbles on both sides of the workbench are solved.