| 摘要 |
Long undercut channels, such as a dovetail channel, are cut by electroerosion into a workpiece by a succession of electrodes each operating to provide electroerosion along the whole length of the groove rather than by an electrode passing lengthwise down the groove. The electrodes are successively advanced obliquely into the workpiece, the path of one electrode intersecting that of the other electrode or electrodes, the non-working electrodes being retracted while one of the electrodes is advanced for operation. An arrangement for simultaneously cutting two dovetail channels oppositely located on the inside of a tubular workpiece is illustrated.
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