Cut-Off Flank wear (mm) KGD type GDM/GDMS/GDG type Cut-off toolholders for automatic lathe great for high pressure coolant Edge pre KGD-JCT (for automatic lathe) Series Edge prep. 1 Optimized coolant hole position Series GMM-MT 2 Discharge coolant towards theflank face of the insert GMM-NB Directing coolant towards the cutting edge lengthens GMM-TK tool life. GMN-TK H Coolant discharging GMN (Std.)(No indication KGD-JCT Competitor A Sufficient cooling Coolant does not flow directly towards the cutting edge towards the cutting edge Wear resistance comparison (Internal evaluation) Cutting edge condition (after machining 20min) 0.20 0.15 KGD-JCT Competitor A (Internal coolant type) KGD-JCT Competitor A 0.10 High density and high speeds coolant provides effective cooling of the cutting edge 0.05 Superior cooling action improves tool life 0.00 0 20 40 60 80 Cutting time (min) Cutting conditions: Vc = 80 m/min, f = 0.06 mm/rev (~2 mm : f=0.02 mm/rev), KGDR1625H-2JCT, GDM2020N-015PF PR1535 (CW: 2.0 mm) Workpiece material : SUS304 (ø25) Internal coolant (1.5MPa) Cut-off H24