1442 556-561 565-566 557-562 553 CONTACT INFORMATION For more information please call +1 330 928 7744 or send an email to ataorders@atatools.com NOTES ON USE FOR: STEP DRILLS / TUBE- AND SHEET DRILLS Karnasch Step Drills Karnasch step drills were developed to drill perfectly round and simultaneously deburr holes in iron sheets of 4 mm Thickness. The radius transition simultaneously bezels or deburrs the boreholes. While conical drills bore slightly conical holes, our Karnasch step drills bore cylindrical holes. The drills are axial-radially relief grounded and can be resharpened at the tooth face. While using a hand drill machine we recommend small step drills (up to diameter 30 mm). For bigger models we recommend the application of stationary drilling machines. Karnasch Conical Drills The holes are deburred on both sides by the preturning cut. Karnasch conical drills are developed to boreholes in thin materials, enlarge existing holes, drill angular holes and make holes penetrating each other. They are suitable for every hand drill machine to drill PVC, polystrol, polyester, plexiglass, steel, card, ply wood and similar materials. These conical drills can be resharpend many times, if treated carefully. Use cooling lubricants for all metals (see from page 1233). Material Mild steel Mild steel Alloy steel Cast iron Cast iron Stainless steel CuZn alloy brittle CuZn alloy tough Alu. Alloy up to Thermoplastic Duroplastic < 700 N/mm² > 700 N/mm² 1000 N/mm² < 250 Nmm² > 250 Nmm² < 1000 N/mm² 11% Si Cutting speed (m/min) 15 10 6 12 8 6 20 15 25 20 15 mm rpm rpm rpm rpm rpm rpm rpm rpm rpm rpm rpm 4.0-12.0 1900-600 1700-580 1550-520 1190-400 800-250 400-130 4700-1550 2750-920 2350-790 1550-520 1190-400 4.0-20.0 1900-400 1700-350 1550-300 1190-240 800-160 400-80 4700-950 2750-550 2350-470 1550-300 1190-240 12.0-20.0 600-400 600-350 520-300 400-240 250-160 130-80 1550-950 920-550 790-470 520-300 400-240 4.0-24.0 1900-300 1700-280 1550-250 1190-200 800-130 400-65 4700-790 2750-460 2350-400 1550-250 1190-200 6.0-30.0 1300-250 1200-230 1000-200 780-150 530-100 250-50 3150-630 1850-370 1590-310 1000-200 780-150 20.0-30.0 400-250 350-230 300-200 230-150 160-100 80-50 950-630 550-370 470-310 300-200 230-150 6.0-36.0 1300-220 1200-200 1000-170 780-130 530-90 250-45 3150-530 1850-300 1590-260 1000-170 780-130 30.0-40.0 250-200 230-180 200-150 150-120 100-80 50-40 630-470 370-280 310-240 200-150 150-120 40.0-50.0 200-160 180-140 150-125 120-90 80-65 40-30 470-380 280-220 240-190 150-125 120-90 50.0-60.0 160-130 140-110 125-100 90-80 65-50 30-25 380-310 220-185 190-150 125-100 90-80 11 Index 10 9 OIL 8 7 6 5 4 3 2 1
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