Technical Information
Failure and Solution Guide
problem
cause
possible solution
thread with torn fi nish
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• Burs.
Torn fi nish.
Steps.
Improper shim.
Improper infeed. •
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• Use modifi ed fl ank infeed.
Use full profi le insert.
Increase coolant concentration.
Increases m/min.
Check machine “Z” travel axis.
Check insert form.
Check for correct shim in LT system.
Calculate fl ank clearance.
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• Poor rigidity.
Insert movement.
Improper infeed.
Off centreline. •
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• Use modifi ed fl ank infeed.
Minimise tool overhang.
Check for workpiece defl ection.
Check insert and clamp.
Verify that tool cutting position is at workpiece centreline.
Adjust number of passes. Fewer passes reduce chatter.
• Speed too low.
• Insuffi cient coolant.
• Chip load. •
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• Increase m/min.
Increase coolant concentration and/or fl ow.
Adjust infeed angle.
Increase depth of cut per pass.
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• Use modifi ed fl ank infeed.
Use a more wear-resistant grade (e.g., TN6010 ™ ).
Reduce m/min.
Increase coolant fl ow.
chatter
built-up edge
deformation
Wrong grade.
Speed too high.
Improper infeed angle.
Insuffi cient coolant.
chipping
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• Improper infeed.
Chip load.
Wrong grade.
Incorrect speed.
Poor rigidity.
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• Heavy chip load.
Small nose radius.
Wrong grade.
Improper infeed.
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• Improper shim.
Wrong grade.
Insuffi cient coolant.
Off centreline.
Insuffi cient fl ank clearance.
Improper infeed angle.
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Use modifi ed fl ank infeed.
Increase or decrease number of passes.
Eliminate spring passes.
Use tougher grade (e.g., TN6025 ™ ).
Increase m/min if chipping on trailing edge.
Decrease m/min if chipping on leading edge.
Minimise tool overhang.
Check for insert movement/check clamp. Torque screw
or clamp to correct value.
• Check for possible part defl ection.
• Calculate fl ank clearance.
• Ensure correct shim.
broken nose
F82
Use modifi ed fl ank infeed.
Decrease chip load.
Use large nose radius if possible.
Use tougher grade (e.g., TN6025).
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Ensure correct shim.
Use a more wear-resistant grade (e.g., TN6025).
Increase coolant fl ow.
Check the centreline height of the tool. (The smaller the diameter, the
more critical the need for centreline accuracy.)
• Calculate fl ank clearance and change shim to increase clearance on
worn fl ank.
• If wear is on trailing fl ank, increase infeed angle clearance.
widia.com
fl ank wear
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