| 单词 |
overcut |
| 释义 |
ˈovercut, n.
[over- 5, 1.]
†a. A cut or direct way over a hill, etc. Obs.
1636Boston Rec. (1877) II. 13 All the ground lying betweene the two brooks..and soe to the other end unto shortest over⁓cut beyond the hill towards the north west.
b. A cutting or incision from above or on the upper surface.
1883E. Ingersoll in Harper's Mag. Jan. 202/1 A big two-handed saw [was] set at work to make the overcut.
c. Mining. A cut at or near roof level in a seam.
1940Trans. Inst. Mining Engin. XCIX. 55 When the undercut is in coal, the importance of effective shovelling may be less, but it must always remain to give freedom of working to the machine, and it is only when an intermediate or overcut is taken that it is unnecessary. 1960J. Sinclair Winning Coal vi. 170 When overcuts at a greater height are required..a hydraulic turret machine..is generally most satisfactory.
d. In electrochemical machining, the distance between the outside surface of the cathode and the side of the cut in the part being machined.
1965New Scientist 5 Aug. 336/2 If the voltage is allowed to fluctuate, the size of the overcut will fluctuate, and it becomes impossible to machine parts to close tolerances. 1974J. A. McGeough Princ. Electrochem. Machining v. 146 The amount of overcut can be diminished by several devices, including insulation along the external side walls of the cathode. |
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