A Study on the Electro-Spark Machining by the Alternating Current

Abstract

In this paper, a study of the electro-spark machining process by the alternating current in the circuit used by Lazarenko is described. The results of this investigation are as follows : With the alternating current, the machining speed is maximum and in the widest extent of the work-current machining is stable, using a solid brass bar electrode. The larger the condenser capacity is, the wider this extent becomes, and the larger the work-current grows, at which the machining speed is maximum as in the case of direct current. Regardless of the condenser capacity, the electrode consumptions are almost constant under a certain work-current, which is largest when a solid brass bar electrode is used. Under a certain diameter of electrode, machining speed is little affected by it. The clearance between hole and electrode is also little influenced by the work-current, if it is beyond a certain value.