Poor hole surface or chatter (reaming)

?Likely causes

• Insufficient cutting fluid causes built-up edgeAgreed by 2+ makers^[1][2]
• Poor chip evacuationAgreed by 2+ makers^[1][2]
• Pilot hole surface is poor, or the reaming allowance is not suitableAgreed by 2+ makers^[1][2]
• Runout at the lead chamfer or in the mountingAgreed by 2+ makers^[1][2][3]
• Cutting speed or feed is highAgreed by 2+ makers^[1][2][3]
• Damage or chipping of the cutting edge remainsAgreed by 2+ makers^[1][3]
• Chatter: margin (cylindrical land) is too wide, reaming allowance is small, poor mounting, or feed is lowOne maker^[1]

✓Fixes

Cutting conditions

• Reduce the feed per revolution and adjust the rotation speedAgreed by 2+ makers^[2][3]

Tool

• Use a reamer with oil holesOne maker^[2]
• When regrinding, completely remove the previous damageOne maker^[3]

Setup

• Retighten or replace the holder, or use a shrink-fit holderOne maker^[2]
• Change the pilot drill so the reaming allowance is suitable, or clean up the hole with an end mill after drillingOne maker^[2]

Coolant

• Use a highly lubricating cutting fluid and increase the flow and pressure (replace degraded water-soluble fluid)Agreed by 2+ makers^[2][3]

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