Increasing the speed, the volume of metal etched per hour is called the processing speed. The processing speed of ultra-fine graphite electrodes is 1.5-3 times faster than copper electrodes. Large area processing under high current conditions. However, due to the low melting point of the copper electrode, its processing current is limited.
Moreover, the tolerance of the workpiece contour after machining is the machining accuracy, which is closely related to whether the electrode material is resistant to wear. In EDM, there are several types of electrode material losses; such as volume loss, end face loss, side loss, and corner loss. Of the four losses, the corner loss is the largest, and the size of the corner loss determines the electrode life.