Countersinking

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countersinking [′kau̇nt·ər‚siŋk·iŋ]

(mechanical engineering)

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

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.

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