Process: Spark Erosion


Spark erosion (sinker electrical discharge machining, cavity type EDM, volume EDM) is an electronic process to cut metal pieces.

Spark erosion is performed in sinker electronic discharge machines, which has an electrode and a workpiece that are lowered in an insulating liquid. Both the electrode and the workpiece are connected to a power supply. The electrode is moved towards the component until a short circuit (or more correctly a dielectric breakdown) appears. Electricity is led from the electrode through the isolating liquid and the component, and the electricity cuts the workpiece. The electricity pulsing, which means the power is rapidly turned on and off. This is measure in on time, when the power creates sparks, and off time, the pause between every spark.

Using spark erosion, it is possible to manufacture complex shapes which are difficult to with conventional machines. It is also possible to get very fine tolerances in very hard materials. In addition, it is possible to machine small and sensitive workpieces, workpieces that any conventional machine would break because of its tool pressure.

Spark erosion is a quite rare manufacturing process, although found in some workshops. The electrical current usually determines the end result; a if it is high, the machining is quick and done rapidly but tolerances are less accurate. On the other hand, if the current is low, the machining process is slow but with fine tolerances.

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E.g., 05/07/2020
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Spark Erosion projects for quote

  1. Drawings count: 2

    Machining-Spark Erosion

    This manufacturing consultant is currently in need of a supplier who can assist with both the immediate - as well as ongoing - supply of the attached jig body, to be made from free-issue material. There is an immediate order to place for this enquiry, which is expected to be repeated two to three times per year in similar quantities.

  2. Drawings count: 1

    Machining-Spark Erosion

    An urgent requirement for the spark erosion of a free-issue aluminium manipulator has been requested. This buyer has a huge global presence, making this is a fantastic opportunity to work with a company who operate within many sectors, including construction, nuclear and oil/gas/petrochemical. Their current vendor is full and therefore, they are looking to increase their supplier base, which will lead to ongoing, similar work in addition to this initial requirement. Please quote your best lead time when submitting your quote. Because of the urgent nature of this project, should a suitable quote be found quickly, the enquiry will be awarded early.

  3. Drawings count: 1

    Machining-Spark Erosion

    This client, a research institute currently working for the nuclear sector, seeks a supplier who can assist in the manufacture of the attached shear. The material required is of bespoke composition. As such, materials will be provided free-issue by the client.There is an immediate order to place for this one off requirement, with the potential for additional opportunities moving forward.

  4. Drawings count: 1

    Machining-Spark Erosion

    This company is looking for a reliable third party who can spark erode the attached components from free-issue material. There is an order to place for 2 off each component and similar work may be presented to the sucsessful supplier, once a relationship has been established. Reliability and quality are of utmost importance to this buyer.

  5. Drawings count: 2

    Machining-Spark Erosion

    This company specialises in the manufacture of fasteners. They are seeking the assistance of a third party to spark erode letters onto the end of a free-issue plunger. As well as having an immediate order to place, they have advised that the requirement will be ongoing and would like to collaborate with a vendor who can assist on a repeat basis. This is a new aspect to the design of the plunger, for which a supplier has not yet been allocated.

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