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Related to Countersinking: spot facing, trepanning

countersinking[′kau̇nt·ər‚siŋk·iŋ]

(mechanical engineering)

Drilling operation to form a flaring depression around the rim of a hole.

McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

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 It might be outdated or ideologically biased.

Countersinking 

a method of working (finishing) conical surfaces (bevel edges or chamfers) of center holes in parts prior to center adjustment for further finishing or before assembly. In single-unit and small-series production countersinking is performed on drilling machines, and in large-series and mass production it is done on centering machines with center-bit drills and countersinks.

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