Fracture (large chipping or cracking)

?Likely causes

• Shock from interrupted cutting or hard materialsAgreed by 2+ makers^[1][2][3]
• Tool kept in use with advanced wearAgreed by 2+ makers^[4][2][5]
• Feed or depth of cut is excessiveAgreed by 2+ makers^[4][6][7]
• Poor insert mounting (dirty seat, insufficient clamping torque)Agreed by 2+ makers^[1][3][8][9]
• Thermal cracks act as the starting pointAgreed by 2+ makers^[2][10]
• Chips jammed against the edgeAgreed by 2+ makers^[2][3]

✓Fixes

Cutting conditions

• Reduce the feed and depth of cut (for heavy interrupted cutting, reduce the feed and use a thicker shank)Agreed by 2+ makers^[1][6]

Tool

• Use a tougher gradeAgreed by 2+ makers^[4][1][6]
• Use larger honing and land, a larger corner radius, and a strong breakerAgreed by 2+ makers^[1][6]
• Shorten the tool change interval and check wear earlyAgreed by 2+ makers^[4][2][5][9]

Setup

• Clean the seat and tighten to the specified torqueAgreed by 2+ makers^[1][3][9][8]

Coolant

• Evacuate chips (use air)Agreed by 2+ makers^[2][8]

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