Page 312 - Demo

310 ISCAR FORMULAS AND DEFINITIONSMaterial Removal Rate (MRR)Material removal rate is the volume of material removed per unit time, usually measured in cubic centimeter per minute (cm%u00b3/min) or cubic inches per minute (in%u00b3/min).Formula:MRR = D %u00d7 fn %u00d7 vc 4 When:MRR = material removal rate (cm%u00b3/min)D = diameter of the drill (mm)fn = feed per revolution (mm/rev)vn = cutting speed (m/min)Net Power (Pnet)Net power is the actual power required to perform the cutting operation, measured in watts (W) or horsepower (hp).Formula:Pnet = Fc %u00d7 vc 60 When:Pnet = net power (W)Fc = cutting force (N)vc = cutting speed (m/min)Torque (T)Torque is the rotational force applied by the spindle to the drill bit, measured in Newton-meters (Nm) or pound-feet (lb-ft).Formula:T = Fc %u00d7 D 2000 When:T = torque (Nm)Fc = cutting force (N)D = diameter of the drill (mm)