Countersink

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countersink

[′kau̇nt·ər‚siŋk]
(design engineering)
The tapered and relieved cutting portion in a twist drill, situated between the pilot drill and the body.

Countersink

 

(Russian, zenkovka; from German senken, “to sink, lower”), a cutting tool used for countersinking. Countersinks usually form part of a set with centering drills. The sizes of countersinks in each set depend on the diameter of the hole; in all sets, the vertex angle is 60°. Coun tersinks are made for chamfering center holes with diameters of 0.5 to 1.5 mm (ordinary countersinks), for holes with diameters of 0.5 to 6 mm (with or without protective taper), and for holes with diameters of 8 to 12 mm (with tapered stem). Countersink cutting elements are made from high-speed steel; countersinks with tapered stems are welded and the stems are made from carbon structural steel.

countersink

countersink
A boring bit having a conical-shaped cutter; used to make a depression to receive the head of a screw or bolt so that it does not protrude above the surface.
References in periodicals archive ?
With Amana's carbide-tipped countersinks with pilot drills, woodworkers can drill a pilot hole and tapered countersink in one step to help guide screws during project assembly.
Worldwide Industrial designed its new cutting tools manufacturers & distributors directory as a user-friendly and extensive resource for those sourcing saw blades, end mills, lathe centers, drilling inserts, drill blanks, countersinks, tap & die, hand tools, keyseat cutters, face mills, counterbores, reamers and other tools to cut virtually every material that can be cut," said Stevens.
net spokeswoman Katherine Brown, the marketplace recently added a small selection of cutting & tapping fluids, countersinks & counterbores, chucking reamers, carbide-tipped tool bits, carbide indexable turning tools, broaches, custom-made cut-off tools, premium solid carbide endmills, abrasives and other metal cutting tools at http://www.
Designed for grinding small- to medium-size tools such as end mills, drills, stepdrills, taps, and countersinks, the S18 5-axis CNC tool grinder is equipped with a specially balanced grinding spindle powered by a 5.
Talbot tool brands - Data Flute CNC, Weldon Tool, Brubaker Tool, Fastcut, New England Tap and Micro Carbide Tool - serve the automotive, aerospace and other metalworking industries with high-performance solid carbide and high-speed steel/cobalt end mills, drills, taps, reamers, countersinks and counterbores.
The Whiny-Gig handle from Severance Tool Industries, Saginaw, MI, is designed to make quick work of secondary hole finishing operations when used with Midget Mills, rotary files, burning and chamfering cutters, aircraft style countersinks, and a wide variety of other tools.
Also shown will be a new line of double-ended countersinks that can reduce tooling investments and lower inventory control costs.
Production testings of drills, drill countersinks, and two-flute 10 deg helix endmills cutting aerospace carbon fiber composites produced excellent tool life and workpiece finish as did diamond cut routers and herringbone style endmills cutting fiberglass and wood composites with excellent tool life and workpiece finish.