Walls lean or are wavy (end milling)

?Likely causes

• Depth of cut or feed is largeAgreed by 2+ makers^[1][2][3]
• Insufficient tool rigidity or long overhangAgreed by 2+ makers^[2][3]
• Tool wear is largeAgreed by 2+ makers^[2][3]
• Helix angle is largeOne maker^[1]
• Waviness or lean from the previous operation remainsOne maker^[2]

✓Fixes

Cutting conditions

• Reduce the depth of cut and use step machining in the axial directionAgreed by 2+ makers^[2][1][3]
• Reduce the feed per toothAgreed by 2+ makers^[2][1][3]
• Split into roughing, semi-finishing, and finishing, and reduce the finishing allowanceAgreed by 2+ makers^[2][4]
• Do the finishing pass with up millingOne maker^[2]

Tool

• Use a rigid tool (carbide, thick shank, short cutting length)Agreed by 2+ makers^[2][3]
• Use an end mill with a small helix angleOne maker^[1]

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