Twist drills (also commonly referred to as twist bits) are the most widely used of all drill bit types; they will cut anything from wood and plastic to steel and concrete. They are most frequently used for metal cutting, so they are generally made from M2 high-speed steel.
People also ask, how does a twist drill work?
Twist drills are rotary cutting tools that normally have two cutting edges and two flutes which are grooves formed in the body to provide cutting lips, to permit the removal of chips and to allow coolant or cutting fluid to reach the cutting action.
One may also ask, what is the point angle of a twist drill? The most common twist drill bit (sold in general hardware stores) has a point angle of 118 degrees, acceptable for use in wood, metal, plastic, and most other materials, although it does not perform as well as using the optimum angle for each material.
People also ask, why is a twist drill unique?
An essential feature of a twist drill is the helix angle (spiral angle). It determines the process of chip formation. Larger helix angles provide effective removal of soft, long-chipping materials. Smaller helix angles, on the other hand, are used for hard, short-chipping materials.
What are the parts of a twist drill?
It is made from a round bar of tool material , and has three principles parts: the point, the body and the shank. The drill is held and rotated by its shank. The point comprises the cutting elements while the body guides the drill in the operation. The body of the drill has two helical grooves called “ flutes”.