1. Check the Spot Drill for dull, worn or broken edges.
2. Be sure the Drill Collet Nut is secure.
3. Check the Drill Holder and Drill Collet to be sure it is not cracked, broken, or has burrs.
4. Check the Drill Holder Seat to see if it is broken.
5. Check the alignment of the Drill Holder on the tool slide to be sure it is properly aligned with the Drill Saddle.
6. Check the Drill Saddle to be sure it is properly aligned with the centerline of the Spindle.
7. Make sure the drill does not contact the part during the Approach portion of the cycle.
8. Check to be sure a Cross Slide tool is not dull or damaged and is pushing the part during machining.
9. Check the Positive Stop tension of the Center Tool Slide to be sure it is properly set.