Disc electrode for arc cutting

Abstract From the Canadian patent

The invention relates to an improvement in a device for cutting material by electric sparks, which device comprises a disc of electrically conductive material through which a dielectric liquid circulates, a central support supporting the disc for rotary motion, and an electrical current supply between the periphery of said disc and said material. The disc is formed with a group of at least three circumferentially spaced radial slots therein which inhibit deformation of the disc by the current the slots having a, length equal to at least L/2 where L is the radial distance bet-, ween the periphery of the disc and the support.