Homemade Wire EDM Machines

discharge machining

EDM in an engineering term referring to electrical discharge machining. Wire electrical discharge machining or EDM is a metalworking process with help of which a material is separated from a conductive work piece, by means of electrical erosion. In this process, the wire never comes in contact with the conductive work piece. The wire electrode leaves a path on the work piece, which is slightly larger than the wire. Most often a 0.010′ wire is used, which creates a 0.013′ to 0.014′ gap. The wire electrode once passed through the work piece cannot be reused.

Wire electrical discharge machining is a complicated assembly, but efforts have been made to build this system at home. While building a wire electrical discharge machining system at home the biggest problem is breaking the wire. Often engineers use the full power of 70 volts, which the wire cannot withstand. If a VARIAC is used, it can vary the alternate current output, producing varying voltages. It can also control and vary the direct current out put. If the voltage is maintained at 55Volts, a spark is produced without breaking the wire electrodes.

In the home made wire electrical discharge machining system, the reducing gear doubles as an encoder and drills 50 holes of equal space. Mainly a ½ – 20 threaded rod acts like a feed screw. The counts go to a PLC, which is outfitted with starts, reverse and stop functions. It is equipped with an appropriate motor, which enables easy rectangular movement. The homemade wire electrical discharge machining system is also supplemented with manual switches for free burning.

The homemade systems can only be used for working on small work pieces. However, the developments have been encouraging and ensure an ongoing process that will definitely create a market for the home built systems.

Source by Josh Riverside

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