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214, Velachery Tambaram Main Road, Pallikkaranai,
Chennai 600100, India
Phone: +91 8754483577
Fax: +91-44-22469027
Website: www.gmt.co.in

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...in pursuit of perfection.
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trouble shooting guide

To help you identify and correct common problems

Choice of anvils

Table

Reference Cause Remedy
Excessive flankwear

cutting-tools trouble shooting
Cutting speed too high,
Infeed per pass too small-or too many passes,
Incorrect infeed method
Incorrect carbide grade
- Reduce the cutting speed
- Increase the cutting depth per pass to
  minimum 0.05 mm on the last pass
- Change to modified flank infeed method
- Select a more wear resistant grade in the
  grade optimizing chart
Plastic deformation

cutting-tools trouble shooting
Excessive temperature in the cutting zone
Incorrect carbide grade
Poor coolant supply
Excessive amount of material to machine
- Reduce the cutting speed
- Increase the number of passes-reduce
  the largest infeed depth
- Select a grade with better resistance against
  plastic deformation in the grade optimizing chart
- Increase the coolant supply
- Check the component dimensions before the threading operation
Edge failure

cutting-tools trouble shooting
Too high load on the cutting edge
Incorrect carbide grade
Poor chip control
Bad stability
- Increase the number of passes (less infeed per pass)
- Choose a tougher grade in the grade optimizing chart
- Change to modified flank infeed
- Check the coolant supply (to assist chip removal)
- Check and eventually stablize the setup
Chipping (both edge and flank)

cutting-tools trouble shooting
Vibrations
Incorrect carbide grade
Poor coolant supply
- Check the stability of both the tool and the component
- Choose a tougher grade in the grade optimizing chart
- Increase and improve the coolant supply
Unequal flankwear

cutting-tools trouble shooting
Incorrect helix angle of the tool
compared to the lead angle of the thread
Incorrect infeed method
- Modify your choice of anvil in the anvil selection chart
- Use modified flank infeed method
Built up edge

cutting-tools trouble shooting
Too low temperature in the cutting zone
Incorrect carbide grade
- Increase the cutting speed
- Do not use coolant
- Select a coated insert or an insert that is able
  to withstand high cutting speeds
Vibration

cutting-tools trouble shooting
Incorrect cutting data
Poor stability
Incorrect centre height
- Increase the cutting speed
- Reduce the overhang and select the most
  rigid holder(Use the most rigid set up possible)
- Check the centre height and the dimension of
  the workpiece (the smaller the diameter, the more
  important is the centre height)
Poor surface finish

cutting-tools trouble shooting
Incorrect cutting data
Incorrect helix angle of the tool compared to the desired lead angle of the thread
Incorrect infeed method
- Increase the cutting speed
- Modify your choice of anvil in the anvil selection chart
- Choose modified flank or radial infeed method
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