(Wire  cutting and grinding disc Electrical Discharge Machining referred WEDM), an electrical processing areas by the former Soviet Union Raza Linke couple created and invented the electric spark processing methods. EDM also invented in 1960 in the former Soviet Union, the country is the first one for the industrial production of the country. The basic physical principles of free positive ions and electrons present in the accumulation , and soon to be ionized to form a conductive path . At this stage, a current between the two plates . Causes numerous collisions between particles occurs , to form a plasma , and soon raised to 8000-12000 degrees Celsius , the two conductor surface instantly melt some materials , and because the electrode and the dielectric liquid is vaporized to form a bubble , rules and its rise until the pressure is very high . Then current is interrupted , the temperature suddenly reduced, causing air bubble implosion , the power generated to melt the material thrown cutting and grinding disc  the crater , and then etching the dielectric material of condensed liquid back into small spheres, dielectric fluid was discharged . Then through the NC-controlled monitoring and control, servo implementation, so that uniform discharge phenomenon .