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 working 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 working current grows, at which the machining speed is maximum as same as in the case of direct current. Regardless the condenser capacity, the electrode consumptions are almost constant under a certain working 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 working current, if it is beyond a certain value.
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