| 摘要 |
A holder for a graphite electrodes of varying sizes is used in an electric discharge machine with a pair of jaws, one jaw being fixed and the other being movable relative to a support. A screw passes through threaded holes in both jaws. In a second, more preferred embodiment, the holder includes a pair of jaws mounted on a support, the jaws being threadedly engaged with a dual setscrew having threaded portions of mutually opposite orientations. A positioning setscrew anchors the dual setscrew, and prevents the dual setscrew from moving longitudinally. The electrode is centered because the jaws are maintained equally distant from the center of the support.
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