Page 12 - Demo

10 ISCAR GENERAL DRILLING HANDBOOKThe Main Parameters of the DrillThat Defines Its Functionality Are:Drill Diameter %u2013 The largest diameter of cutting zone, measured between intersection points of cutting edges and drill body. The drill diameter determines the diameter of the hole (Figure 1.2.2).Figure 1.2.2drill diameter drill diameter Shank Size %u2013 The type and size of the drill shank depends on the chuck in which the drill will be clamped. Various shank and chuck combinations can provide improved performance such as higher torque and more centering accuracy. (Figure 1.2.3).Figure 1.2.3ShankOverall Length %u2013 The total length of the drill which includes the length of the cutting zone and the length of the clamping zone, i.e. distance between two extreme planes of the tools which are perpendicular to the central axis of the drill (Figure 1.2.4). Figure 1.2.4overall lengthFlute Length %u2013 The effective length of the drill which determines the maximum depth of the machined hole. The flute length defined as the distance between two perpendicular planes to the central axis of the drill that are placed on the chisel point and the end of the flute (Figure 1.2.5).Figure 1.2.5flute length