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Electrical discharge machining. Electrical discharge machining (EDM), also known as spark machining, spark eroding, burning, die sinking, wire burning or wire erosion, is a manufacturing process whereby a desired shape is obtained by using electrical discharges (sparks).
The idea is to use DykemÂ® machinist's layout fluid in place of the Sharpie marker on the surface of the optical component. Dykem is a very thin paint or dye that machinists brush onto metal parts to allow them to draw on the metal with any sharp scribing tool. They scribe the layout of cutting and drilling locations (& etc.) directly onto a metal part before machining.