Possible cause for the drill breaks when drilling
1: Spring or back lash in press or work
2: Too little lip relief
3: Speed too low in proportion to the feed
4: Dull drill
5: Improper chip clearing
How to do drill breaks when drilling with twist drill bits
1: Test press and work for rigidity and alignment
2: Regrind properly
3: Increase speed or decrease feed
4: Sharper drill
5: Correct application