What is EDM?
EDM - Electrical Discharge Machining - is a machining procedure especially used for the manufacture of dies, moulds and specific metal parts.
In the machining area each discharge produces a crater (removal of material) in the workpiece and a burn-off (electrode consumption of the tool) on the wire. The wire can be tilted producing conic workpieces or workpieces with different profiles on the top and bottom sides.
There is never any mechanical contact between the electrode and the workpiece! Usually, the wire is made of multilayer copper or brass with a diameter ranging from 0.02 to 0.3 mm.
Electrical Discharge Machining at FEOB is precision workmanship with high-quality wire and die-sinking installations in air-conditioned rooms.
Where and when is EDM applied?
End products such as cutting dies, parts made from one single workpiece and parts of a complex shape, e.g. injection moulds for the manufacture of plastic cases for music cassettes, can be manufactured by EDM (also spark EDM).
For parts with complex contours and - e.g. in the case of milling - that are difficult to clamp wire EDM is often a cost effective alternative.