Abstract
In wire EDM using a fine wire electrode, the decreasing of wire vibration is important to achieve high-precision machining, because the large amplitude of wire vibration leads to large kerf width. The wire vibration is caused by the impact force due to electrical discharges and wire running. The amplitude can be decreased by increasing wire tension. In this report, the movement of wire electrode was observed by using high-speed video camera and analyzed in order to clarify the relation between wire behavior and wire tension. Moreover, the state of electrical discharges was also directly observed and the possibility to evaluate the discharge dispersion was discussed.
