Drill wears quickly (peripheral corner, margin, center)

?Likely causes

• Cutting speed is high (wear of the peripheral corner and margin)Agreed by 2+ makers^{[1][2][3][4][5][6]}
• Cutting speed is low (wear is greater toward the center)Agreed by 2+ makers^[4][5][1]
• Mounting runout (wear on the margin or on one side only)Agreed by 2+ makers^[1][3][4][6]
• Excessive feed, or too many steps cause chips at the hole bottom to be bitten (wear at the tip)One maker^[6][4]
• Insufficient lubrication or coolantAgreed by 2+ makers^[1][4][5][3]
• Regrinding is done too lateAgreed by 2+ makers^[4][5]

✓Fixes

Cutting conditions

• For abnormal wear at the periphery, reduce the cutting speedAgreed by 2+ makers^{[1][2][3][4][5]}
• For abnormal wear at the center, increase the cutting speedAgreed by 2+ makers^[4][5][1]

Tool

• Regrind earlierAgreed by 2+ makers^[4][5]

Setup

• Check runoutAgreed by 2+ makers^[1][3][4]

Coolant

• Use a highly lubricating fluid, increase the oil content, and raise the supply and pressureAgreed by 2+ makers^[1][4][5][3]

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