This study investigates near-dry EDM milling as a finishing process to achieve a mirror-like surface finish.A liquid-gas mist mixture is the dielectric medium delivered through a rotating tubular electrode in the near-dry EDM milling.Near-dry EDM exhibits the advantage of good machining stability and smooth surface finish at low discharge energy input.An EDM power generator is modified by adding an electrical resistance to enable the reduction of surface roughness.Effects of dielectric fluid, electrode material and pulse energy on material removal rate and surface roughness are studied.The mirror-like surface finish with 0.32 /lm Ra is achieved using the kerosene mist and copper infiltrated graphite electrode with 100 /lJ pulse energy.
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A 2008 study studied this question.