Fine boring heads provide high-precision finishing options for many applications, however, fine boring can be a delicate operation that can go awry. Under certain conditions, it might be necessary to modify or adapt recommended cutting data or tooling configurations of the application. We’ve provided solutions to common fine boring problems to help get you back on the road to productivity.

Need some help with your rough boring? Check out this troubleshooting guide for rough boring.?

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Poor Tool LifeWrong insert gradeChange to higher wear resistant grade
Excessive speedReduce SFM
Poor cooling of insertApply through-tool coolant
Excessive stock allowanceDecrease depth of cut
Chatter & VibrationExcessive speedReduce SFM, check cutting data tables
Extreme length/diameter rationShorten tool to increase stiffness
Increase boring bar diameter to larger size
Change boring bar to carbide or heavy metal
Wrong insertReduce nose radius of insert
Use ground geometry inserts (ie: TAN18 grade)
Incorrect stock allowanceCheck cutting data tables
Poor Size RepeatabilityInaccurate tool changesWorn and/or damaged tool shank; replace
Clean spindle and tool shank
Variation of stock allowanceSemi-finish with twin insert boring head
Excessive spindle loosenessUse ground geometry inserts (ie: TAN18 grade)
Unacceptable RoundnessExcessive boring tool imbalanceChange to auto-balance or balanceable head
Balance tool assembly
Reduce speed
Excessive cutting forcesCheck stock allowance and feed rate
Insufficient workpiece clampingCheck for uniform workpiece clamping
Workpiece non-symmetricalReduce cutting forces; change to ground insert
Increase cutting speed, reduce feed
Unacceptable PositionOriginal bore off positionSemi-finish with twin insert boring head
Excessive stock allowanceDecrease depth of cut
Decrease insert radius
Reduce cutting forces; change to ground insert
Poor Surface FinishWrong insert radiusUse larger insert radius
Excessive feed rateReduce feed; maximum 25% of insert radius
Poor chip evacuationIncrease bore Coated Inserts to boring bar clearances
Apply through-tool coolant; adjust nozzles
Change insert to higher rake angle
Check depth of cut
TaperPremature insert wearChange to higher wear resistance insert grade
Increase insert radius
Change from ground to pressed geometry insert
Increase coolant flow

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