Hole is not round, bends, or tapers (reaming)

?Likely causes

• Workpiece holding is unstableAgreed by 2+ makers^[1][2][3]
• Runout of the spindle or the reamerAgreed by 2+ makers^[1][2][3]
• Pilot hole is misplaced, bent, or misalignedAgreed by 2+ makers^[1][2]
• Margin is too narrow, lead angle is large, or helix angle is unsuitableOne maker^[2]
• Damage to the lead chamferOne maker^[1]
• Uneven wall thickness of the workpieceOne maker^[3]

✓Fixes

Tool

• Use a high-rigidity solid carbide reamerOne maker^[2]
• For workpieces with uneven wall thickness, reduce the guide width (margin width)One maker^[3]

Setup

• Review the clamping position and holding methodAgreed by 2+ makers^[2][3]
• Correct the runout (retighten the holder, use shrink fit, alignment)Agreed by 2+ makers^[2][3]
• Drill the pilot hole with a short flute drill or a carbide drill, and correct bending with an end millOne maker^[2]

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