Abstract
In order to realize precision machining in EDM, it is needed to avoid the wear of an electrode. In this paper, the wear rate of an electrode, especially the edge portion of the electrode is evaluated by measuring the change of electrode shape in machining. The wear rate of the electrode on the whole is rather small at the beginning of machining. It increases in the progress of time, and reaches to a certain value which depends on the machining condition and the material of the electrode and work piece. At the beginning of machining, the bottom flat portion of the electrode expands owing to carbon layer out of the working fluid and the edge portion of the electrode wears remarkably.
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