1：Unstable machining accuracy of CNC machine tools

Possible reasons include spindle bearing wear, excessive screw clearance or incorrect program parameters. Equipment should be regularly maintained, machine tool accuracy should be calibrated, and G code should be checked for errors.

2：Drill bits break easily

This is common when drilling deep holes or hard materials. Countermeasures:

Select drill bits with good rigidity (such as cobalt-containing drill bits);

Drill holes in stages to avoid feeding too deep at one time;

Ensure adequate cooling.