Chips stretch long or tangle

?Likely causes

• Feed is smallAgreed by 2+ makers^{[1][2][3][4][5][6]}
• Depth of cut is shallowAgreed by 2+ makers^[1][3][2]
• Large corner radius or large side cutting edge angleAgreed by 2+ makers^[1][3][2]
• Chip breaker does not match the conditions (effective range is too large)Agreed by 2+ makers^[1][3][2][4]
• Highly ductile material (aluminum, mild steel, etc.) makes chips hard to breakAgreed by 2+ makers^{[7][8][9][6][10]}

✓Fixes

Cutting conditions

• Increase the feed to make chips thicker and easier to breakAgreed by 2+ makers^{[1][2][3][4][5][6][10]}
• Increase the depth of cutAgreed by 2+ makers^[1][3][2]
• In drilling, force chip breaking with step feed (pecking)Agreed by 2+ makers^{[6][10][4][7][11]}

Tool

• Select a chip breaker with good chip breaking performanceAgreed by 2+ makers^[1][3][2][4]
• Use a smaller corner radius and a larger lead angle (smaller side cutting edge angle)Agreed by 2+ makers^[1][3][2]

Coolant

• Use high-pressure or precision coolant, or through-tool coolantAgreed by 2+ makers^{[1][11][12][6]}

▦Notes by material

• Aluminum alloy (A5052, etc.): Chips run continuously and wrap around the tool, easily damaging the hole surface. Break them with step machining^[7]

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