In this paper the authors studied the mechanism of materials' erosion when applying pulsed electrical discharge machining (PEDM) during the dimensional processing and the formation of deposition layers. It is known that during the processing the tool-electrode wear occurs. The practical part of the paper is of particular interest that describes design and the construction of a device intended for auto-adjusting of the gap size at the processing by applying PEDM. As a result, there is a stable amount of power released in the interstitial space, to avoid uncontrolled wear of the tool-electrode, for the homogeneous processing, free from defects leading to an increase in dimensional processing precision.
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