twist drill

American  

noun

Machinery.

1. a drill with one or more deep helical grooves in the body.

---

twist drill British  

noun

1. a drill bit having two helical grooves running from the point along the shank to clear swarf and cuttings

---

Etymology

Origin of twist drill

First recorded in 1870–75

Example Sentences

The tools of industry expanded to include such useful items as the twist drill and ratchet wrench.

From Slate • May 29, 2014

The speed of the drill must be as slow again as for the ordinary flat drill, and not more than one-third as fast as the twist drill.

From Modern Machine-Shop Practice, Volumes I and II by Rose, Joshua

The simplest form of twist drill used is shown at Fig.

From Aviation Engines Design?Construction?Operation and Repair by Pag?, Victor Wilfred

One must avoid distorting the orifice, which should be perfectly circular; clean it out with a small twist drill of the proper size.

From Things To Make by Williams, Archibald

A twist drill possesses three cutting edges marked a, b, c respectively in Fig.

From Modern Machine-Shop Practice, Volumes I and II by Rose, Joshua