Cause of issue:

  ① The long-term high-speed operation of the machine tool carriage causes wear of the screw and bearing

② The repeated positioning accuracy of the tool holder will cause deviation in long-term use

③ The carriage can accurately return to the starting point of processing every time, but the size of the workpiece is still changing.

This phenomenon is generally caused by the spindle. The high-speed rotation of the spindle causes serious bearing wear and changes in the machining dimensions. Solution (compared with the above)

  1. Use a dial indicator to lean against the bottom of the tool holder, and at the same time edit a fixed cycle program through the system, check the repeat positioning accuracy of the carriage, adjust the screw clearance, and replace the bearing

2. Use a dial indicator to check the repeat positioning accuracy of the tool post, adjust the machine or replace the tool post

3. Use a dial indicator to check whether the workpiece can be accurately returned to the starting point of the program after processing the workpiece;

If possible, repair the spindle and replace the bearing

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