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Countersink   Listen
verb
Countersink  v. t.  (past countersank; past part. countersunk; pres. part. countersinking)  
1.
To chamfer or form a depression around the top of (a hole in wood, metal, etc.) for the reception of the head of a screw or bolt below the surface, either wholly or in part; as, to countersink a hole for a screw.
2.
To cause to sink even with or below the surface; as, to countersink a screw or bolt into woodwork.


noun
Countersink  n.  
1.
An enlargement of the upper part of a hole, forming a cavity or depression for receiving the head of a screw or bolt. Note: In the United States a flaring cavity formed by chamfering the edges of a round hole is called a countersink, while a cylindrical flat-bottomed enlargement of the mouth of the hole is usually called a conterbore.
2.
A drill or cutting tool for countersinking holes.





Collaborative International Dictionary of English 0.48


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"Countersink" Quotes from Famous Books



... the size of the egg to be operated upon. Drills are to be procured from the various dealers, but can be made from steel wire softened in the fire and filed to a sharp three-cornered point—afterwards tempered to hardness—for the smaller eggs, or filed up for the larger eggs to the pattern of a "countersink" used for wood; indeed, the smallest-sized "countersink" made—to be procured at any ironmonger's—will do very well for eggs the size of a hen's. Capital egg-drills are to be made from "pinion wire" used by watchmakers. ...
— Practical Taxidermy • Montagu Browne
... they may be driven up by degrees with a heavy hammer, whereby any distortion of the holes from unequal driving will be prevented. Finally, the ends of the tubes should be riveted up so as to fill the countersink; the tubes should be left a little longer than the distance between the outer surfaces of the tube plates, so that the countersink at the ends may be filled by staving up the end of the tube rather than by riveting it over; and the staving will be best accomplished by means of a mandril with a ...
— A Catechism of the Steam Engine • John Bourne
... various dealers, but can be made from steel wire softened in the fire and filed to a sharp three-cornered point—afterwards tempered to hardness—for the smaller eggs, or filed up for the larger eggs to the pattern of a "countersink" used for wood; indeed, the smallest-sized "countersink" made—to be procured at any ironmonger's—will do very well for eggs the size of a hen's. Capital egg-drills are to be made from "pinion wire" used by watchmakers. Simply file to a point, and "relieve" with a small ...
— Practical Taxidermy • Montagu Browne


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