GENERAL TECHNICAL INFORMATION INSERTS FAILURE TROUBLE SHOOTING Cause • Excessive cutting speed or feed rate (alloy steel and over 0.3% carbon steel) Crater Wear • Workpiece material contains high hardness chemical elements (tool steel, die steel) • Excessive cutting speed (alloy steel and over 0.3% carbon steel) Flank Wear • Workpiece material contains very hard chemical elements (tool steel, die steel) • Increase cutting speed if abnormal flank wear caused by very slow cutting speed. Deformation • Excessive cutting speed or feed rate • Excessive feed rate Chipping • Interrupted cut • Machining of scale parts Notching • High work hardening materials • Slow cutting speed Built-up edge • Sticky materials MechanicalFracture • Excessive feed rate of interrupted cut ThermalCracking • Thermal shock repeatedly (interrupted cut) 1158