ATA International Product Catalogue

1548 CONTACT INFORMATION For more information please call +353 49 435 2138 or send an email to ask@atagroup.ie Formula for circular milling Formula classifications in the cutting tool industry Dimension new character according to DIN 6580/84 speed r pm 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/mm 2 kc specific cutting force at N/mm 2 kc1.1 h = 1 mm and b = 1 mm spec. time-chip volume cm 3 /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 cm 3 /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 fz a Contour feed per tooth mm fz kont Middle cutting thickness mm hm Feeder speed for circular milling an the rotary grinder mm/min vf kont 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/mm 2 kc Free angle ˚ a D 1 · p · n 1000 Vc = Vc · 1000 D 1 · p n = Vf = fz · z · n Vf n · z fz = h = fz · sin k ap · ae · vf 1000 Q = ap · ae · vf · kc 6 · 10 7 · 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 fz a w Vf Vf kont D 1 –D 2 ar = 2 D 2 –D 1 ar = 2 D 1 2 –D 2 2 4 · D 1 –D D 2 2 –D 1 2 4 · D 1 +D fz · 360 · ae D 1 · p · w hm · D 1 · p · w 360 · ae fz · 360 · ae D 1 · p · w hm · D 1 · p · w 360 · ae fz · z · n · D 1 (D 1 – D) fz · z · n · D 1 (D 1 + D) arccos [1 – (2 · ae/D 1 )] fz · z · n hm · D/ar ! WW hm · D 1 /ae ! WW fz · ae/D 1 ! WW fz · ae/D 1 ! WW hm · D 1 /ae ! WW 11 Index 10 9 OIL 8 7 6 5 4 3 2 1