Electrical Discharge Milling
Electric sparks are the cutting edges of the new tools to machine hard metals. In electrical discharge milling , or spark machining as it is sometimes called, metal is removed by controlled electrical discharges across a dielectric gap. This process process is used for regular shop jobs such as drilling, reaming, broaching, die sinking and grinding and other work in hard metal alloys which are impractical to carry out with conventional equipment. Even common every-day materials because of contours to intricate for shaping by standard methods are routinely handled by this little wonder. But now you can put Electrical Discharge Milling in your own home shop with these plans and instructions.