| 摘要 |
An electric discharge machine capable of obtaining an average voltage between a workpiece and an electrode with a simple device. A voltage E is impressed between the electrode and the workpiece to cause an electric discharge to flow a machining current I for an on-time period TON, and after an off-time period TOFF, the voltage E is impressed between the electrode and the workpiece again. The above cycle of the electric discharge is repeated to machine a workpiece. The on-time period TON and the off-time period TOFF are of constant set values. The average voltage V is obtained according to the following equation using the number N of off-time periods or electric discharges in a set time period TA. V={(TA-Nx(TON+TOFF))/TA}xE Since TA, (TON+TOFF) and E are constant values, a value of the average voltage V is determined by counting the number N which is not so large, to make a counting device simple.
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