Monitoring the E.D.M. process by radio signals

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Abstract
Experimental studies are described to show that high-frequency radio observations provide a simple way to monitor the E.D.M. process and to distinguish between the effective spark and arc discharges. The paper also describes how radio frequency emitted during machining could be used to optimize the E.D.M. process. It was found that radiation from the region of the gap between the electrode (tool) and the workpiece are significantly different when the following conditions occur: open voltage, sparking (effective machining), arcing and short circuit. However, a reliable technique was developed to monitor the rate of metal removal and machining efficiency during the E.D.M. process

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