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more about counterbore
counterbore |
3 definitions found From Webster's Revised Unabridged Dictionary (1913) [web1913]: Counterbore \Coun"ter*bore`\ (-b?r`), n. 1. A flat-bottomed cylindrical enlargement of the mouth of a hole, usually of slight depth, as for receiving a cylindrical screw head. 2. A kind of pin drill with the cutting edge or edges normal to the axis; -- used for enlarging a hole, or for forming a flat-bottomed recess at its mouth. From Webster's Revised Unabridged Dictionary (1913) [web1913]: Counterbore \Coun`ter*bore"\ (koun`t?r-b?r"), v. t. To form a counterbore in by boring, turning, or drilling; to enlarge, as a hole, by means of a counterbore. From WordNet r 1.6 [wn]: counterbore n : a bit for enlarging the upper part of a hole [syn: {countersink}, {countersink bit}]
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