Formula of Calculation, Holemaking Number of revolutions vcx12 n rpm Cutting speed Dc x 7t x n vc= 2 ft/min Feed rate per revolution f fz x Z in

Formula of Calculation, Holemaking Number of revolutions vcx12 n rpm Cutting speed Dc x 7t x n vc= 2 ft/min Feed rate per revolution f fz x Z in Feed rate Vf f x n in/min Metal removal rate (Drilling) Q vf x 71 x (Dc / 2)2 in3/min Chip thickness h fz x sin Specific cutting force kc kcw1.1 x h-mcw lbs/in2 Power requirement (Drilling) Dc x Vc x f x kc Pmot ccc HP 132,000 x TI Power requirement (Boring) Q x kc Pmot nnnc. HP 396,000 x Torque (Drilling) Dc2 x fz x kc Mc c / in lbs Torque (Boring) Dc x ap x f x kc Mc p in lbs n Number of revolutions rpm Dc Cutting diameter in Z Number of teeth vc Cutting speed ft/min vf Feed rate in/min fz Feed per tooth in f Feed per revolution in A Chip section in2 Q Metal removal rate in3/min Pmot Power requirement HP Mc Torque in lbs h Chip thickness in n Machine efficiency (0.7-0.95) K Approach angle kcw1.1 Specific cutting force lbs/in2 related to a chip section of 1.0 in mcw kc curve rise for mcw and kcw1.1 use values only from page H7. H 3 General technical information WALTER