1. Be sure the drill is the correct size diameter.
2. Check to be sure the drill is sharp.
3. Check for a bent drill.
4. Inspect the length of the cutting edges at the drill point to be sure they are the same.
5. Check to be sure the Cross Slide tool is not contacting the drill at high point.
6. Check to be sure the Drill Holder is securely mounted to the Tool Slide.
7. Be sure the Drill Holder is on the centerline of the Spindle.