721 Material groups Application Cutting speed SFPM m/min Steel cast steel Non-hardened, non-heat treated steels up to 1200 N/mm2 (< 38 HRC) Construction steels, carbon steels, tool steels, non-alloyed steels, case-hardened steels, cast steels Coarse machining = high stock removal with impact load 820-2953 250-900 Hardened, heat treated steels exceeding 1200 N/mm2 (> 38 HRC) tool steels, tempered steels, alloyed steels, cast steels 820-1148 250-350 Non-Ferrous metals High-temperature resistant materials Nickel based alloys cabalt based alloys (aircraft engine and turbine construction) Coarse machining = high stock removal with impact load 820-1476 250-450 Cast iron Gray cast iron, white cast iron Cast-iron with flake graphite EN-GJL (GG), with nodular graphite cast iron EN-GJS (GGG), white anneales cast iron EN-GJMW (GTW), black cast iron EN-GJMB (GTS) Coarse machining = high stock removal with impact load 820-1969 250-600 Cutting speed SFM 820 1640 1969 2953 m/min 250 500 600 900 ∅ (in) ∅ (mm) Rotational speed (rpm) 1/4" 6 13,000 27,000 32,000 48,000 5/16" 8 10,000 20,000 24,000 36,000 3/8" 9.6 8,000 16,000 19,000 30,000 1/2" 12 7,000 13,000 16,000 24,000 5/8" 16 5,000 10,000 12,000 18,000 CUT SPECIFICATION OMEGA CUT 11 Index 10 9 OIL 8 7 6 5 4 3 2 1
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