CUTTING TOOLS – CUTTING SPEED – GUIDE

This cutting tools and cutting speed trouble shooting guide will help you with common problems faced during machining.

Reference	Cause	Remedy
Excessive flankwear	Cutting speed too high, Infeed per pass too small-or too many passes, Infeed method incorrect Incorrect carbide grade	– Reduce the cutting speed – Also, 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	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	Too high load on the cutting edge Incorrect carbide grade Poor chip control Bad stability	– Increase the number of passes (less infeed per pass) – Also, 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)	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	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	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	Incorrect cutting data Poor stability Centre height incorrect	– Increase the cutting speed – Reduce the overhang and select the most rigid holder(Use the most rigid set up possible) – Also, check the centre height and the dimension of the workpiece (the smaller the diameter, the more important is the centre height)
Poor surface finish	Incorrect cutting data Incorrect helix angle of the tool compared to the desired lead angle of the thread Infeed method incorrect	– Increase the cutting speed – Also, modify your choice of anvil in the anvil selection chart – Also, choose modified flank or radial infeed method

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