Abstract
This paper describes the Multi-spark EDM method which was newly developed to obtain higher removal rates and lower energy consumption compared with conventional EDM. The basic circuit of Multi-spark EDM comprises a pulse generator, a first tool electrode, the workpiece, and a second tool electrode that are connected serially in the order as listed here. Accordingly, for each generator pulse, one discharge occurs in the gap between the first tool electrode and the workpiece, and another discharge occurs at the same time in the gap between the other tool electrode and the workpiece. To balance the removal rates in both gaps, the polarity of the pulse generator is changed adaptively to equalize the gap voltages measured at both gaps.
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