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EDM has made considerable progress

Fifty years after the first industrial machine, Oil EDM Filters has made considerable progress. Recent improvements in machining speed, accuracy and roughness have been achieved mostly with improvements in robotics, automatization, process control, dielectric, flushing and generator design [15–18]. The other main research domains are the machining of nonconductive materials such as ceramics [19, 20], micro-machining [21–24], characterization and improvement in the machined surface quality [25, 26], and modelling of the EDM process [27–29]. But so far, few studies have been done on the discharge itself, which lies at the heart of the process.

However, in various fields, breakdown in dielectric liquids or solids have already been studied: pre-breakdown and breakdown in different liquids [30, 31] and condensed matter [32], exploding wires in water [33], laser produced plasma in transformer Oil EDM Filters [34], and Teflon capillary discharges [35] for example. These plasmas have similar properties to those of the EDM plasma.

Though EDM keeps unmatched abilities such as the machining of hard materials and complex geometries, this technique has to evolve constantly in order to stay competitive and economically interesting in the modern tooling market against other traditional or new machining techniques Oil EDM Filters

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