EDM
Electric Discharge Machining (EDM) is a proccess to create surface texture on the tool mould, by eroding small layer of steel. An electrical spark of intense heat is created between an electrode and a workpiece of the tool, and can melt away almost anything. The spark is very carefully controlled and localized so that it only affects the surface of the material. The EDM process usually does not affect the heat treat below the surface. Water constantly flows to acts as a coolant and flushes away the eroded metal particles. The conductivity of the water is carefully controlled making an excellent environment for the EDM process.
