counterboren.

/ˈkaʊntəbɔː/

Etymology: counter- prefix 2g(b): see note at countersink v.

= countersink n. 1, 2.

ΘΚΠ

society > occupation and work > equipment > building and constructing equipment > fastenings > [noun] > screw > enlargement of hole receiving screw

counterborea1884

the world > space > relative position > condition of being open or not closed > an opening or aperture > [noun] > a hole bored, pierced, or perforated > enlarging > an enlargement

countersunk1794

countersink1846

counterborea1884

society > occupation and work > equipment > piercing or boring tools > [noun] > tools for enlarging holes > countersink

countersink1815

countersinker1881

counterbore1939

a1884 E. H. Knight Pract. Dict. Mech. Suppl. 226/2 Counter-bore, a cylindrical counter-sink, usually made with a pin-drill.

1939 C. B. Cole Tool Making 97 In emergency, another form of counterbore is used.

1948 A. P. Morgan Tools xii. 209 Counterbores are end-cutting tools used to enlarge a drill hole for a portion of its length.

1967 O. Almeida Metalworking xii. 192 Counterbores..may be turned in the workshop from silver steel or plain carbon steel, and the flutes filled.

1977 Reader's Digest Bk. Do-it-Yourself Skills & Techniques v. 152 Drill the counter bore before drilling clearance holes for the threads.

This entry has not yet been fully updated (first published 1989; most recently modified version published online December 2020).

counterborev.

/ˈkaʊntəˌbɔː/

Etymology: See counterbore n.

transitive. To enlarge (the upper part of a cylindrical hole or cavity) to take the head of a screw. Also absol. Cf. countersink v. 1.

ΘΚΠ

the world > space > relative position > condition of being open or not closed > making holes or becoming holed > make (an opening or hole) [verb (transitive)] > by boring, piercing, or perforating > enlarge borehole

counterbore1890

society > occupation and work > industry > working with tools or equipment > fastening > fasten [verb (transitive)] > with screws > enlarge (hole) to receive screw-head

countersink1831

counterbore1890

society > occupation and work > industry > working with tools or equipment > fastening > fasten [verb (intransitive)] > enlarge hole to receive screw-head

counterbore1984

the world > space > relative position > condition of being open or not closed > making holes or becoming holed > become or make perforated [verb (intransitive)] > make (a) hole(s) > through something > enlarge a borehole

counterbore1984

1890 in Webster's Internat. Dict. Eng. Lang.

1939 C. B. Cole Tool Making 95 To counterbore a hole previously machined by drilling or reaming is to enlarge the hole to the required diameter and depth.

1939 C. B. Cole Tool Making 96 The pilot diameter determines the size of the hole that can be counterbored.

1975 R. A. Salaman Dict. Tools 38/1 The adjustable L-shaped cutter bar..enlarges or counterbores the hub to the required depth.

1984 E. P. DeGarmo et al. Materials & Processes in Manuf. (ed. 6) xxi. 594 Special combination drills are made that can drill two or more diameters, or drill and countersink and/or counterbore, in a single operation.

Derivatives

ˈcounterbored adj.

ΘΚΠ

society > occupation and work > industry > working with tools or equipment > fastening > [adjective] > with screw > of hole: enlarged to receive screw-head

countersunk1865

counterbored1920

the world > space > relative position > condition of being open or not closed > an opening or aperture > [adjective] > having (a) hole(s) > bored, pierced, or perforated > with a sharp-pointed instrument > enlarged

counterbored1920

1920 Engin. & Mining Jrnl. 7 Feb. 405/2 They run on hardened tool-steel shafts set in counterbored sockets open at the top only.

ˈcounterboring n.

ΘΚΠ

the world > space > relative position > condition of being open or not closed > an opening or aperture > [noun] > a hole bored, pierced, or perforated > enlarging

counterboring1905

society > occupation and work > industry > working with tools or equipment > fastening > [noun] > with screws > sinking screw-head into hole

counterboring1905

1905 J. Horner Tools for Engineers & Woodworkers xi. 125 Every one knows the trouble of counterboring in wood.

1909 Cent. Dict. Suppl. Counterbored, counterboring.

1948 A. P. Morgan Tools xii. 209 Counterboring of small diameter can be done by hand power.

1984 E. P. DeGarmo et al. Materials & Processes in Manuf. (ed. 6) xxi. 599 Counterboring provides an enlarged, cylindrical hole with a flat bottom so that a bolt head, or a nut, will have a smooth bearing surface that is normal to the axis of the hole.

This entry has not yet been fully updated (first published 1893; most recently modified version published online September 2018).

单词	counterbore
释义	counterboren. /ˈkaʊntəbɔː/ Etymology: counter- prefix 2g(b): see note at countersink v. = countersink n. 1, 2. ΘΚΠ society > occupation and work > equipment > building and constructing equipment > fastenings > [noun] > screw > enlargement of hole receiving screw counterborea1884 the world > space > relative position > condition of being open or not closed > an opening or aperture > [noun] > a hole bored, pierced, or perforated > enlarging > an enlargement countersunk1794 countersink1846 counterborea1884 society > occupation and work > equipment > piercing or boring tools > [noun] > tools for enlarging holes > countersink countersink1815 countersinker1881 counterbore1939 a1884 E. H. Knight Pract. Dict. Mech. Suppl. 226/2 Counter-bore, a cylindrical counter-sink, usually made with a pin-drill. 1939 C. B. Cole Tool Making 97 In emergency, another form of counterbore is used. 1948 A. P. Morgan Tools xii. 209 Counterbores are end-cutting tools used to enlarge a drill hole for a portion of its length. 1967 O. Almeida Metalworking xii. 192 Counterbores..may be turned in the workshop from silver steel or plain carbon steel, and the flutes filled. 1977 Reader's Digest Bk. Do-it-Yourself Skills & Techniques v. 152 Drill the counter bore before drilling clearance holes for the threads. This entry has not yet been fully updated (first published 1989; most recently modified version published online December 2020). counterborev. /ˈkaʊntəˌbɔː/ Etymology: See counterbore n. transitive. To enlarge (the upper part of a cylindrical hole or cavity) to take the head of a screw. Also absol. Cf. countersink v. 1. ΘΚΠ the world > space > relative position > condition of being open or not closed > making holes or becoming holed > make (an opening or hole) [verb (transitive)] > by boring, piercing, or perforating > enlarge borehole counterbore1890 society > occupation and work > industry > working with tools or equipment > fastening > fasten [verb (transitive)] > with screws > enlarge (hole) to receive screw-head countersink1831 counterbore1890 society > occupation and work > industry > working with tools or equipment > fastening > fasten [verb (intransitive)] > enlarge hole to receive screw-head counterbore1984 the world > space > relative position > condition of being open or not closed > making holes or becoming holed > become or make perforated [verb (intransitive)] > make (a) hole(s) > through something > enlarge a borehole counterbore1984 1890 in Webster's Internat. Dict. Eng. Lang. 1939 C. B. Cole Tool Making 95 To counterbore a hole previously machined by drilling or reaming is to enlarge the hole to the required diameter and depth. 1939 C. B. Cole Tool Making 96 The pilot diameter determines the size of the hole that can be counterbored. 1975 R. A. Salaman Dict. Tools 38/1 The adjustable L-shaped cutter bar..enlarges or counterbores the hub to the required depth. 1984 E. P. DeGarmo et al. Materials & Processes in Manuf. (ed. 6) xxi. 594 Special combination drills are made that can drill two or more diameters, or drill and countersink and/or counterbore, in a single operation. Derivatives ˈcounterbored adj. ΘΚΠ society > occupation and work > industry > working with tools or equipment > fastening > [adjective] > with screw > of hole: enlarged to receive screw-head countersunk1865 counterbored1920 the world > space > relative position > condition of being open or not closed > an opening or aperture > [adjective] > having (a) hole(s) > bored, pierced, or perforated > with a sharp-pointed instrument > enlarged counterbored1920 1920 Engin. & Mining Jrnl. 7 Feb. 405/2 They run on hardened tool-steel shafts set in counterbored sockets open at the top only. ˈcounterboring n. ΘΚΠ the world > space > relative position > condition of being open or not closed > an opening or aperture > [noun] > a hole bored, pierced, or perforated > enlarging counterboring1905 society > occupation and work > industry > working with tools or equipment > fastening > [noun] > with screws > sinking screw-head into hole counterboring1905 1905 J. Horner Tools for Engineers & Woodworkers xi. 125 Every one knows the trouble of counterboring in wood. 1909 Cent. Dict. Suppl. Counterbored, counterboring. 1948 A. P. Morgan Tools xii. 209 Counterboring of small diameter can be done by hand power. 1984 E. P. DeGarmo et al. Materials & Processes in Manuf. (ed. 6) xxi. 599 Counterboring provides an enlarged, cylindrical hole with a flat bottom so that a bolt head, or a nut, will have a smooth bearing surface that is normal to the axis of the hole. This entry has not yet been fully updated (first published 1893; most recently modified version published online September 2018). > as lemmas counter-bore counter-bore v. Brit. /ˌkaʊntəˈbɔː/ , U.S. /ˌkaʊn(t)ərˈbɔr/ ΚΠ 1611 J. Florio Queen Anna's New World of Words Contraforare, to counter~bore. extracted from counter-prefix < n.a1884v.1890 as lemmas
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counterboren.

counterborev.

Derivatives

> as lemmas