Technical Guidance Tool Edge Failure Technical Guidance Tool Failure and Remedies Trouble Shooting Guide for Turning Damage Cause Countermeasures Excessive flank wear - Grade lacks wear resistance. - Select a wear resistant grade. P30 a P20 a P10 K20 a K10 a K01 - Use an insert with a larger rake angle. - Cutting speed ist too fast. - Decrease the cutting speed. - Feed rate ist far too slow. - Increase feed rates. Excessive crater wear - Grade lacks crater wear - Select a more crater-resistant grade. resistance. - Rake angle is too small. - Use an insert with a larger rake angle. - Select an appropriate chipbreaker. - Cutting speed is too fast. - Decrease the cutting speed. - Feed rate and depth of cut are - Decrease the D.O.C. and feed rate. too large. Cutting edge chipping - Grade lacks toughness. - Change to tougher grades. P10 a P20 a P30 - Insert falls off due to chip build-up. K01 a K10 a K20 - Cutting edge lacks toughness. - Increase amount of honing on cutting edge. - Reduce rake angle. - Feed rate and depth of cut are - Reduce feed rates and depth of cut. too large. Cutting edge fracture - Grades lacks toughness. - Change to tougher grades. P10 a P20 a P30 - Cutting edge lacks toughness. K01 a K10 a K20 - Holder lacks toughness. - Select a chipbreaker with a strong cutting edge. - Select a holder with a larger approach angle. - Feed rarte is too fast. - Select a holder with a larger shank size. - Depth of cut is too large. - Decrease the D.O.C. and feed rate. Build-up edge - Inappropriate grade selection. - Select a grade with less affinity to the work material. Coated carbide or cermet grades. - Dull cutting edge. - Select a grade with a smooth coating. - Use an insert with a larger rake angle. - Reduce amount of honing. - Cutting speed is too slow. - Increase cutting speeds. - Feed rate ist too slow. - Increase feed rates. Plastic deformation - Grade lacks thermal resistance. - Select a more crater-wear-resistant grade. - Use an insert with a larger rake angle. - Cutting speed is too fast. - Decrease the cutting speed. - Feed rate is too fast. - Reduce feed rates and depth of cut. - Depth of cut is too large. - Not enough cutting fluid. - Supply a sufficient amount of coolant. Notch wear - Grade lacks wear resistance. - Select a wear resistant grade. P30 a P20 a P10 K20 a K10 a K01 - Rake angle is too small. - Use an insert with a larger rake angle. - Cutting speed is too fast. - Alter depth of cutto shift the notch location. N4