Step drills & Core drills / 373 www.nortonabrasives.com RECOMMENDED CUTTING SPEEDS Material High Carbon steel up to<750 N Alloyed steel up to <1200 N Stainless Steel Aluminium Grey Cast iron Brass Copper Vc=m/min 20 10 12 37 18 25 40 Ø mm R.P.M 12-18 530-350 265-175 320-210 980-655 480-320 660-440 1060-700 19-25 340-250 165-130 200-150 620-470 300-230 420-320 670-510 26-32 245-200 125-100 145-120 455-370 200-180 305-250 490-400 33-39 195-165 95-80 115-95 360-305 175-147 240-200 390-330 40-46 160-140 79-70 90-85 295-255 143-125 195-170 320-280 47-53 135-120 67-60 80-72 250-225 122-108 165-150 270-240 54-60 115-105 58-53 70-63 220-195 106-95 145-130 235-210 FOR HSSM2 AND HSS-E Material High Carbon steel up to<750 N Alloyed steel up to <1200 N Stainless Steel Aluminium Grey Cast iron Brass Copper Vc=m/min 45 30 20 90 35 50 35 Ø mm R.P.M 12-18 1327-796 795-530 530-350 2390-1590 930-620 1325-885 930-620 19-25 754-537 500-380 340-250 1510-1150 590-450 840-635 590-450 26-32 550-448 370-300 245-200 1100-895 430-340 615-500 430-340 33-39 434-367 290-245 195-165 870-735 335-285 490-410 335-285 40-46 358-311 240-265 160-140 715-625 280-240 400-345 280-240 47-53 304-270 200-180 135-120 610-540 239-210 340-300 239-210 FOR T.C.T. CORE DRILL It is recommended to use HSSM2 and HSS-E tools with cutting oil, except for grey cast iron, where compressed air should be used to keep it clean and cool. It is recommended to use T.C.T tools with coolant, except for grey cast iron, where compressed air should be used to keep it clean and cool. STEP DRILLS & CORE DRILLS
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