| 摘要 |
An electrode tool holder for an EDM apparatus which can support either an electrode tool of large size or an electrode tool of small size. The EDM apparatus is provided with a ram consisting of two separate, preferably concentric, linearly movable slide members. One of the slide members, linearly displaceable by a servo motor, carries a holder for an electrode tool of small dimension. The second slide member, although normally linearly displaceable relative to the first slide member, is arranged to be coupled to the first slide member for supporting an electrode tool of large dimension, both coupled slide members being thus driven by the same servo motor.
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