Abstract
The need for better utilization of Electro Discharge Machining (EDM) machines with a minimum cost has forced researchers and machine tool builders to carry out a great deal of development to provide optimum conditions for the EDM process. In this respect, the application of Computer Numeric Control (CNC) to EDM has added a new dimension to the ways in which the electrode and workpiece can be moved relative to each other. It has also increased the efficiency and productivity of the process. However, the CNC system, introduced on ram-type EDM machines, offers more than just the capability for positioning the electrodes and process control. It also facilitates more sophisticated tool motions and the ability to generate complex shapes with simply shaped electrodes. This paper investigates the machining characteristics of 3D form and cylindrical tools and shows the most beneficial results when selecting one of these machining methods. Finally, the paper introduces the economical comparison between these machining methods based upon EDM machining and hand finishing times.
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