1554 CONTACT INFORMATION For more information please call +44 1530 261 145 or send an email to sales@atagarryson.com Formula for circular milling Formula classifications in the cutting tool industry Dimension new character according to DIN 6580/84 speed rpm milling/drilling travel mm lf cutting diameter mm Dc width of cut mm ae cutting speed m/min Vc cutting force N Fc cutting force 1 – mc cutting power kW Pc depth of cut mm ap undeformed chip thickness mm h average undeformed chip thickness mm specific cutting force N/mm2 kc specific cutting force at N/mm2 kc1.1 h = 1 mm and b = 1 mm spec. time-chip volume cm3/kW · min Qsp tool life in feed direction mm Lf tool life min T feed per revolution mm f feed per tooth mm fz Correction factor for Vf mm f2 feed rate mm/min Vf number of tooth Z time-chip-volume cm3/min Q resultant cutting force N F Spiral increase with spiral interpolation mm a Radial allowance mm ar Drive feed for external circular milling mm fza Contour feed per tooth mm fzkont Middle cutting thickness mm hm Feeder speed for circular milling an the rotary grinder mm/min vfkont Drive power kW P Torque Nm M Machine efficiency h Cut arc angle/angle of attack ˚ w Angle of incline for spiral interpolation ˚ d Angle of immersion for complete groove milling ˚ b Tensioning lateral force with reference to the cutting power N/mm2 kc Free angle ˚ a D1 · p· n 1000 Vc = Vc · 1000 D1 · p n = Vf = fz · z · n Vf n · z fz = h = fz · sin k ap · ae · vf 1000 Q = ap · ae · vf · kc 6 · 107 · h P = 9550 · P n M = ar Material Dimension to be calculated INSIDE OUTSIDE ae/D < 0.30 ae/D > 0.30 ae/D < 0.30 ae/D > 0.30 ae hm fz fza w Vf Vfkont D1 –D2 ar = 2 D2 –D1 ar = 2 D1 2 –D 2 2 4 · D1–D D2 2 –D 1 2 4 · D1+D fz · 360 · ae D1 · p · w hm · D1 · p · w 360 · ae fz · 360 · ae D1 · p · w hm · D1 · p · w 360 · ae fz · z · n · D1 (D1 – D) fz · z · n · D1 (D1 + D) arccos [1 – (2 · ae/D1)] fz · z · n hm · D/ar !WW hm · D1/ae !WW fz · ae/D1 !WW fz · ae/D1 !WW hm · D1/ae !WW 11 Index 10 9 OIL 8 7 6 5 4 3 2 1
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