| 单词 | rose bit |
| 释义 | > as lemmasrose bit rose bit n. Engineering a countersink drill bit having a conical head with a number of radial cutting edges that meet at the tip. ΘΚΠ society > occupation and work > equipment > piercing or boring tools > [noun] > drill > types of bit rose bit1842 pod-bit1875 twist-drill1875 twisted bit1875 chamfering-bita1877 twisted drill1884 twist-bit1901 Forstner bit1902 1842 Mag. Sci. 10 Dec. 299/2 Drill the holes to a taper form, by a rose bit of ½ an inch in diameter, for the conical end of the organ pipes. 1875 T. Seaton Man. Fret Cutting 70 A rose-bit is a conical piece of steel, cut into a coarse file, and used for sloping off the edges of the screw-holes, so that the screw~head may not project above the metal. There is another kind of rose-bit for wood-work. 2006 Great Austral. DIY Bk. 23/3 The rose bit is used in hardwood and the snail bit in softwood. < as lemmas |
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