a countersink drill bit having a conical head with a number of radial cutting edges that meet at the tip.
| 单词 | θ212303 |
| 释义 | society > occupation and work > equipment > piercing or boring tools > [noun] > drill > types of bit (12) rose bit1842 a countersink drill bit having a conical head with a number of radial cutting edges that meet at the tip. pod-bit1875 a boring tool for use in a brace. twist-drill1875 see quot. twisted bit1875 a bit of which the mouthpiece consists of a square bar spirally twisted; also in Carpentry: see quot. chamfering-bita1877 chamfering-bit n. a boring-bit used with a brace to chamfer holes to receive the heads of screws. chamfering lathe n. (see quot.). chamfering machine… twisted drill1884 = twist-drill n. at twist, n.1 compounds 2. twist-bit1901 = twisted bit n. at twisted, adj. compounds 1. Forstner bit1902 A type of wood-drilling bit. Subcategories:— parts of bit (4) |
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