Page 310 - Demo

308 ISCAR FORMULAS AND DEFINITIONS %u00bd%u0009General Formulas and Definitions for Drilling OperationsKnowledge to calculate cutting speed and feed is of decisive importance for successful drilling. This section describes general formulas and definitions for drilling operations, in particular for calculating cutting speed, feed per revolution and specific cutting force.Cutting Speed (vc)Cutting speed is the speed at which the cutting edge of the drill moves relative to the material being drilled. It is usually measured in meters per minute (m/min) or feet per minute (ft/min).Formula:vc = %u03c0 %u00d7 D %u00d7 n 1000 When:vc = cutting speed (m/min)%u03c0 = Pi (approximately 3.14159)D = diameter of the drill (mm)n = rotation velocity of drill (revolutions per minute, RPM)Rotation Velocity of the Drill (n)Rotation velocity of the drill or rotational speed of the spindle, measured in revolutions per minute (RPM).Formula:n = 1000%u00d7 vc %u03c0 %u00d7 D When:n = spindle speed (revolutions per minute, RPM)vc = cutting speed (m/min)%u03c0 = Pi (approximately 3.14159)D = diameter of the drill (mm)