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Molybdenum Wire EDM
Molybdenum Wire EDM also referred to as “Fast Wire EDM”, is a form of electrical discharge machining especially suited for slicing, cutting, and profiling parts.
In “Fast Wire EDM”, the wire is mounted on a reciprocating drum and can run for 30-50 hours on one drum fill-up, whereas a regular wire EDM uses the brass wire once and discards it, resulting in high operating costs. When the wire engages your part, a small electrical arc is formed and begins to erode the material on your workpiece. As this erodes, the machine continues forward cutting, allowing for a very straight and delicate cut on any conductive material regardless of its hardness.
Sinker EDM
Sinker EDM also called ram EDM, cavity-type EDM, or volume EDM, consists of an electrode and workpiece submerged in an insulating liquid such as, more typically,[28] oil or, less frequently, other dielectric fluids. The electrode and workpiece are connected to a suitable power supply. The power supply generates an electrical potential between the two parts. As the electrode approaches the workpiece, dielectric breakdown occurs in the fluid, forming a plasma channel, and a small spark jumps.
FAST HOLE DRILLING EDM
Fast-hole drilling EDM was designed for producing fast, accurate, small, and deep holes. It is conceptually akin to sinker EDM but the electrode is a rotating tube conveying a pressurized jet of dielectric fluid. It can make a hole an inch deep in about a minute and is a good way to machine holes in materials too hard for twist-drill machining. This EDM drilling type is used largely in the aerospace industry, producing cooling holes into aero blades and other components. It is also used to drill holes in industrial gas turbine blades, in molds and dies, and in bearings.