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Electrode Wear

Reduced speed for larger holes

Depth of blind holes are difficult to control

EDM drilling works only on electrical CONDUCTIVE material

Only drills in conductive and semi-conductive materials

Can modify the metallurgical quality with recast and heat-affected zone (HAZ) on the surface layer in micron level

A drawback is the formation of a heat affected layer on the machined surface. Since it is impossible to remove all the molten part of the workpiece, a thin layer of molten material remains on the workpiece surface, which re-solidifies during cooling. (White Layer)