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Troubleshooting in parting and grooving

Cause	Solution

Bad surface	Use a short and stable tool Take away the chips - use geometry with good chip control Check speed / feed guidelines Use wiper geometry Check tool set-up

Bad surface on aluminium	Select the sharpest geometry Use geometry with good chip control Select a special soluble oil for the material

Poor chip breakage	Change geometry Select a higher feed Use dwelling (pecking) Increase coolant

Vibration	Use a stable set-up Check speed/feed guidelines Use shorter overhang Change geometry Check tool condition Check tool set-up

Poor tool life	Check centre height Check angle between tool and component Check condition of the blade. If the blade is old, the insert could be unstable in the tip-seat

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Insert wear

Insert edge problems

To achieve optimized cutting data, best possible workpiece quality and tool life, always remember to check the insert edge. At low speeds, built-up edge (BUE) and chipping are the main insert edge problems; at high speeds, plastic deformation (PD), flank wear and crater wear are the main problems. The solutions are presented in the following table.

	Cause	Solution

Built-up edge (B.U.E)	Cutting edge temperature too low Unsuitable geometry or grade	Increase cutting speed and/or feed Choose a geometry with a sharper edges preferably a PVD-coated grade
When parting to centre and on stainless material, it is almost impossible to avoid BUE. It is important to minimize this phenomenon by using the solutions above.

Chipping/breakage	Too hard grade Too weak geometry Unstable conditions Too high cutting data	Choose a softer grade Choose a geometry for higher feed area Reduce overhang. Check centre height Reduce cutting data

Plastic deformation (PD)	Excessive temperature in cutting zone Unsuitable grade Lack of coolant supply	Reduce cutting speed and/or feed Choose more wear resistant grade Improve coolant supply

Flank wear	Cutting speed too high Too soft grade Lack of coolant supply	Decrease cutting speed Choose a more wear resistant grade Improve coolant supply

Crater wear	Cutting speed too high Too soft grade Feed too high Lack of coolant supply	Decrease cutting speed Choose more wear resistant grade Decrease feed Improve coolant supply

Notch wear	Oxidation at the cutting depth Cutting edge temperature too high	Use varying cutting depths (ramping) Reduce cutting speed