Electrical discharge machining, or EDM, is a wicked (and expensive) way of cutting metal to extremely fine tolerances. It's a CNC process whereby two electrodes are precisely placed at opposite ends of the workpiece; a powerful spark is then generated between them, essentially vaporizing the material in the path of the spark. The dross is then flushed away by a constant stream of de-ionized water running across the workpiece. Check it out:
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