Troubleshooting for Fine Boring

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. 

Problem Possible Cause Remedy
Poor Tool Life Wrong insert grade Change to higher wear resistant grade
Excessive speed Reduce SFM
Poor cooling of insert Apply through-tool coolant
Excessive stock allowance Decrease depth of cut
Chatter & Vibration Excessive speed Reduce SFM, check cutting data tables
Extreme length/diameter ration Shorten tool to increase stiffness
Increase boring bar diameter to larger size
Change boring bar to carbide or heavy metal
Wrong insert Reduce nose radius of insert
Use ground geometry inserts (ie: TAN18 grade)
Incorrect stock allowance Check cutting data tables
Poor Size Repeatability Inaccurate tool changes Worn and/or damaged tool shank; replace
Clean spindle and tool shank
Variation of stock allowance Semi-finish with twin insert boring head
Excessive spindle looseness Use ground geometry inserts (ie: TAN18 grade)
Unacceptable Roundness Excessive boring tool imbalance Change to auto-balance or balanceable head
Balance tool assembly
Reduce speed
Excessive cutting forces Check stock allowance and feed rate
Insufficient workpiece clamping Check for uniform workpiece clamping
Workpiece non-symmetrical Reduce cutting forces; change to ground insert
Increase cutting speed, reduce feed
Unacceptable Position Original bore off position Semi-finish with twin insert boring head
Excessive stock allowance Decrease depth of cut
Decrease insert radius
Reduce cutting forces; change to ground insert
Poor Surface Finish Wrong insert radius Use larger insert radius
Excessive feed rate Reduce feed; maximum 25% of insert radius
Poor chip evacuation Increase bore to boring bar clearances
Apply through-tool coolant; adjust nozzles
Change insert to higher rake angle
Check depth of cut
Taper Premature insert wear Change to higher wear resistance insert grade
Increase insert radius
Change from ground to pressed geometry insert
Increase coolant flow

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