| 单词 | centre drill |
| 释义 | > as lemmascentre drill centre drill n. a drill or drill bit designed for drilling holes suited to accepting the centre of a lathe. ΚΠ 1849 J. Weale Rudim. Dict. Terms Archit. 91/2 Centre-drill, a small drill used for making a short hole in the ends of a shaft about to be turned, for the entrance of the lathe centres. 1915 Pop. Mech. Sept. 459/2 The center drill is held in the tailstock and is fed toward the end of the work. 2005 RCM & E (Radio Control Models & Electronics) Apr. 108/1 Another way is to use anything conical that will fit in the drill chuck, like a small centre or even a centre drill. < as lemmas |
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