ECM - Electro-Chemical Machining is the generic term for a variety of electro-chemical processes. ECM is used to machine workpieces by electrolytically dissolving the metal. The process is used in aerospace engineering and the automotive, medical equipment, microsystem and power supply industries. Almost all kinds of metal can be electro-chemically machined, even high-alloyed nickel- or titanium-based ones, as well as hardened materials. As it is a contactless procedure with no heat input, the process is not subject to any of the disadvantages experienced with traditional machining methods, e.g. tool wear, mechanical stresses, micro-fissures caused by heat transfer, surface oxidation or the need for subsequent deburring operations. All electro-chemical machining processes are characterized by stress-free stock removal, gentle transitions and smooth surfaces without burr formation.