Abstract
Powder suspended EDM are know as a method which can finish mirror-like surface by EDM. One of a reason is that, electrical discharge was dispersed using powder suspended fluid. But the roughness of machined surface was different when a several powders mixed, so the influence of gap phenomenon was not apparent. In order to vary the gap phenomenon under the powder suspended EDM, the gap region observed using a high-speed camera system. This report describes the observation result with powder suspended EDM.
