| 单词 | plug centre bit |
| 释义 | > as lemmasplug centre bit plug centre bit n. Woodworking and Mechanics a kind of centre bit having a solid cylindrical projection instead of a central point, which fits into a hole around which a countersink or enlargement is to be made. ΚΠ 1846 C. Holtzapffel Turning & Mech. Manip. II. xxiv. 241 This tool, known as the plug center-bit, is much used in making frames and furniture, held together by screw-bolts. 1928 Old-time New England July 30 (caption) (E and F) called by Holtzapffel, ‘Plug Center Bits’, found among the tools in the amateur Germantown workshop of Mr. C. J. Wister (1820 to 1860).., are constructed like the button bit but lack the outer scribe points and replace the central pointed pivot with a round, blunt plug. 1940 Chambers's Techn. Dict. 654/2 Plug centre bit, a form of centre bit in which the projecting central point is replaced by a plug of metal. < as lemmas |
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