| 单词 | second tap |
| 释义 | > as lemmassecond tap second tap n. Engineering (see quot. 1888). ΘΚΠ society > occupation and work > equipment > machine tool > other specific machine tools > [noun] > machine for cutting screw-threads > taps screw tap1678 tap1678 plug tap1815 tap-tool1874 bottoming tap1875 taper tapa1877 second tap1888 1888 Lockwood's Dict. Mech. Engin. 309 Second tap, a tap intermediate in size between a taper and a plug tap. 1906 G. F. Goodchild & C. F. Tweney Technol. & Sci. Dict. s.v. Tap After the tapering tap has roughed out the thread in the hole, a Second Tap with somewhat less taper may be passed through. 1964 S. Crawford Basic Engin. Processes i. 24 If the hole being tapped is an open or through hole the second tap is quite suitable for finishing the thread. < as lemmas |
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