Patent ID: 6583376
Filing Date: 2003-06-24
Classification: B23H

Abstract:
A wire cut electric discharge machine, comprising:a machining tank storing a machining fluid; an upper arm disposed at an upper portion of the machining tank; a lower arm inserted into the machining tank; a wire electrode extending between the upper arm and the lower arm for performing electric discharge machining on a workpiece placed fixedly in the machining tank; a support member mounted to the machining tank for supporting the lower arm such that the lower arm is slidable relative to the machining tank and sealed from the machining tank, the support member having a groove formed all around its inner circumference; and at least one O-ring interposed between the lower arm and the support member, the width of the groove is less than a sum of a cross-sectional diameter of the at least one O-ring, so the at least one O-ring makes contact with a pair of sidewalls of the groove so that the lower arm is kept sealed from the machining tank.