Drill breaks

?Likely causes

• Chip cloggingAgreed by 2+ makers^[1][2][3]
• Feed is too largeAgreed by 2+ makers^[1][4][3][5]
• Mounting runout is largeAgreed by 2+ makers^[1][4][5]
• Insufficient rigidity or instability of the machine or workpieceAgreed by 2+ makers^[1][2][3]
• Wear is advanced (chipping or abnormal wear left unaddressed)Agreed by 2+ makers^[1][2][3]
• Poor entry, or the entry surface is tiltedAgreed by 2+ makers^[3][5]
• Long flute length and low drill rigidityOne maker^[4][5]
• Insufficient spindle powerAgreed by 2+ makers^[1][2]

✓Fixes

Cutting conditions

• Reduce the feedAgreed by 2+ makers^[1][4][3][5]
• Add steps, or increase the through-coolant pressure to evacuate chipsAgreed by 2+ makers^[2][3][1]

Tool

• Check for damage before breakage and regrind or replace earlyAgreed by 2+ makers^[1][2][3]
• Use a drill with a short flute length and a large web thicknessOne maker^[4][5]

Setup

• Reduce runoutAgreed by 2+ makers^[1][4][5]
• Increase workpiece clamping rigidityAgreed by 2+ makers^[2][3][1]
• Make the entry surface flat or center drillAgreed by 2+ makers^[3][5][2]

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