We do wire EDM, sinker EDM, and fast hole EDM (Electrical Discharge Machining) since 1993.

Sinker EDM


Electrical discharge machining (EDM), sometimes referred to as spark machining, is a nontraditional method of removing metal by a series of rapidly recurring electrical discharges between an electrode (the cutting tool) and the workpiece in the presence of a dielectric field. The ensuing minute metal chips are removed by melting and vaporization, and are washed away by the continuously flushing dielectric fluid. EDM can cut materials regardless of their hardness or toughness, but is limited to the machining of electrically conductive workpiece materials.

The EDM process is most widely used by the mold-making tool and die industries, but is increasingly applied to make prototype and production parts, especially in the aerospace and electronics industries in which production requirements are relatively low. EDM is particularly well suited for parts which are made from materials that are difficult to machine and/or contain small or odd-shaped angles, intricate cavities or intricate contours.

There are two major types of EDM, Wire EDM and Sinker EDM (sometimes called Ram or Conventional EDM). The main difference between the two is the type of electrode used. Wire EDM, as its name suggests, uses wire as the electrode. Certain parts can only be produced using sinker EDM, which, unlike wire EDM, does not cut all the way through the part. As its name implies, Sinker EDM literally "sinks" a required shape into the workpiece.

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Sinker EDM, also called Ram or Conventional EDM, uses an electrically charged electrode to burn a specific shape into a metal component. It sinks shape from the electrode part into the oil immersed work piece, not cutting all the way through the piece. The electrode discharges pulsed electrical sparks that jump to the work piece and tear out small particles. The materials most commonly used for the electrode are graphite, brass or copper tungsten. Graphite is used because of its machining capabilities and wearability, and copper for its fine finish requirements.

Through sinker EDM, parts can be formed out of even the most rigid materials and formed into very complex shapes. However, there are also some materials that cannot be cut with sinker EDM because they are not electrically conductive. These materials include hard and soft ferrite materials and epoxy-rich bonded magnetic materials.

Sinker EDM is used when parts need tight tolerances or when a tight corner radius is required. Sinker EDM is a versatile process, allowing for a variety of sized parts from those that can fit in the palm of a hand to parts that weigh over 1,000 pounds, and everything in between. Production dies and molds are often made through the sinker EDM process for these reasons as well.


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