Page 18 - Demo

16GENERAL DRILLING HANDBOOKISCARNormal Rake - The angle between a face and a plane passing through the selected point on the cutting edge and the drill axis, measured in the plane perpendicular to the cutting edge (Figure 1.2.20).Normal Clearance of the Major Cutting Edge - The angle between a flank and a plane containing the cutting edge and the assumed direction of primary motion at the selected point on the cutting edge measured in the plane perpendicular to the cutting edge at the selected point (Figure 1.2.19).Figure 1.2.20normal clearance of the major cuttingmajor rakeassumed direction of primary motion