Abstract
This paper observes the material removal phenomena in electrical discharge machining in order to discuss the mechanism of material removal in the EDM process. Time when material removal occurs, as well as temperature of the discharge point, size and scattering speed of removed debris particles, was obtained from the observed results using a high-speed video camera. It is found that small debris perticles are removed from high-temperature discharge point and scattered at high speed during the discharge duration, whearas large debris particles are removed from low-temperature discharge point and scattered at low speed after the discharge duration.
