Twist Drills Twist Drills

Lecture 8. Metal Cutting - HKUST IEDA

Drilling: The geometry of the common twist drill tool (called drill bit) is complex; it has straight cutting teeth at the bottom – these teeth do most of the metal cutting, and it has curved cutting teeth along its cylindrical surface (Figure 6). The grooves created by the helical teeth are called flutes, and are useful in pushing the

  Twist