Countersink Reamer

The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

Countersink Reamer

 

a metal-cutting tool designed for finishing (countersinking) the walls of holes. Unlike a drill, a countersink usually has three to six cutting bits located obliquely or perpendicular (in face countersinks) to the shaft axis. Countersinks are manufactured as one-piece units from high-speed steel, as welded units with stems made of carbon structural steel, as assembled units with detachable cutters made of hard alloy, and as attachable units with welded hard alloy plates.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.