Tap teeth chip

?Likely causes

• Tap does not suit the material or applicationAgreed by 2+ makers^[1][2][3]
• Insufficient lubrication or unsuitable cutting fluidAgreed by 2+ makers^[1][3]
• BottomingOne maker^[1]
• Chips jammed (including being pulled in during reversal)Agreed by 2+ makers^{[1][3][4][5][6]}
• Work hardening of the tap drill holeAgreed by 2+ makers^[1][2]
• Abrupt reversal in a blind hole, or uneven feedOne maker^[2]

✓Fixes

Tool

• Select a tap suited to the workpiece material and hole shape (sometimes with a smaller rake angle or lower cutting part hardness)Agreed by 2+ makers^[1][2][3]

Setup

• Make the tap drill hole deeper, or reduce the thread depthAgreed by 2+ makers^[1][7]
• Make the tap drill hole diameter as large as possibleOne maker^[3][2]
• Do not reverse abruptly in a blind hole, and use a floating holderOne maker^[2]
• Prevent work hardening of the tap drill hole (review the drilling conditions)Agreed by 2+ makers^[1][2][8]

Coolant

• Use a suitable cutting fluid and prevent weldingAgreed by 2+ makers^[1][3]

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