Abstract: An EDM electrode assembly including an electrode with a relative uniform, other-than-round shape, in cross-section along its entire length is supported within tubing by an epoxy bushing formed completely around an end portion of the electrode on one end of the tubing to slidably support the electrode. An EDM cartridge assembly constructed in accordance with the above further includes an outer tubing and a mechanism for driving the electrode through the bushing. A method for making the EDM electrode assembly as well as a method of refeeding the electrode.

Abstract: A modular EDM system including a compact servo slide assembly provides flexibility, accuracy and positional repeatability. The servo slide assembly includes a frame member provided with a precision dovetail for mounting on a column or bracket having a mating dovetail. The assembly also includes a slide member having a dovetail to receive and retain an electrode assembly thereon.

Abstract: On-time and off-time control over the current pulses by the timing unit associated with the power supply for EDM apparatus is supervised by fault condition and voltage drop detectors to modify automatic operation of the timing unit. The fault condition detectors monitor gap conditions, and track voltage variations of the dc cutting current supply.