What is EDM?
EDM stands for Electrical Discharge Machining. The basic concept of EDM is that you use an electrode to erode a workpiece using electrical sparks. The electricity flows through the electrode in the form of a square wave attacking the points of least resistance on the workpiece similar to how a bolt of lightning would hit a tree before it hits the ground. This “Zap” happens every time the current is switched on in the square wave and then the current is switched off to allow the debree to be flushed away. This process happens over and over many times a second as the electrode is slowly advanced deeper and deeper into the cut. The electrode never touches the workpiece because the actual cutting is being done by the spark gap between the electrode and the workpiece. The process takes place submerged in a dielectric fluid such as deionized water or dielectric oil. This fluid acts like the vacuum in a light bulb. If you break a light bulb, the fillament which has current flowing through it
