| 单词 | teat drill |
| 释义 | > as lemmasteat drill teat drill n. now rare a flat-faced drill with a small sharp pyramidal projection in the centre of the cutting face, used to make holes with a flattened bottom; also called tit drill.The projection keeps the drill in place as it cuts. ΚΠ 1867 Sci. Amer. 28 Dec. 408/2 The device seems to be eminently well calculated for the support of the cutter on a boring bar, and is applicable, with but slight modification, to a pin or ‘teat’ drill. 1919 E. K. Hammond Mod. Drilling Pract. v. 104 The drill shown..is generally known as a ‘teat’ drill. This type of drill is employed for drilling shallow holes where it is required to have a flat bottom in the hole, or the teat drill may be used for drilling out the bottom of a hole produced with a regular twist drill in order to produce a flat bottom. 1978 U.S. Patent 4,115,017 1 The inner ring thereof is connected to a holding member 22 to secure the drill such as a teat drill. < as lemmas |
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