(BQ) Micro and macro EDM are similar, but differences in machining conditions result in a differing power density, Pe. This causes differences in the ratio of energy consumed for material removal with regard to energy distributed into the workpiece, and the ratio of total removal volume per pulse with respect to the molten area volume, so-called energy efficiency, Ee, and removal efficiency, Re, respectively. It was found
that, the Pe of micro EDM is approximately 30 times greater than that of macro EDM. Consequently, Ee and Re in micro EDM were significantly greater than those of macro EDM.