21 Main Types of Drills | Machine Tools | Industrial Engineering

There is a wide variety of types and sizes of drills. Fig. 18.17 shows the various types of conventional and special purpose drills. Most twist drills are made of high speed steel with or without a carbon-steel shank joined to the body. Some drills are made of cobalt alloys and others have inserts of cemented carbides. Type # 1. Taper-Shank [...]