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EDM can cut intricate contours or cavities in pre-hardened steel without the need for heat treatment to soften and re-harden them. This method can be used with any other metal or metal alloy such as titanium, hastelloy, kovar, and inconel.
Sinker EDMs consists of an electrode and workpiece submerged in an insulating liquid such as oil. Wire EDMs use a thin single-strand metal wire, usually brass, fed through the workpiece, submerged in a tank of dielectric fluid, typically deionized water. Wire-cut EDM is typically used to cut plates as thick as 300mm and to make punches, tools, and dies.