Image Source : Southern Fabricating Machinery Sales
Wired EDM: This is a unconventional process, in which there is no direct contact between the tool and workpiece. In this process a moving metallic wire of small diameter is used to cut a work piece. The sparks between the wire and workpiece are used to remove the material. The wire used may be of diameter 0.1 mm, which is made of brass,copper,molybdenum etc. Here the wire acts as a electrode.Applications are medical,aerospace,cutting of gears.
Die sinking EDM: In this process the electrode and the workpiece are submerged in an insulating liquid. And then power supply is generated,which controls the movement of workpiece and electrical discharges. In this way the sparks are generated in between them.