抄録
The controlled pulse train method was introduced to increase discharge energy and enlarge unit removal per crater in micro electrical discharge machining (EDM) using electrostatic induction feeding method as the pulse generator. With this method, group of discharges is allowed to occur at a single location within a controlled predetermined time known as pulse train duration. By fixing a cylindrical feeding electrode coaxially to the mandrel, capacitance C1 can be formed between the feeding electrode and the tool to realize the non-contact electrical feeding. However, the small feeding capacitance leads to very small discharge energy per pulse causing interval between the pulse discharges and interrupting the discharge continuity within the pulse train duration. This is undesirable because it will affect the size of discharge crater. Thus, by re-designing the feeding electrode the capacitance can be increased even if there is a limit on the length. This paper explains the new design and the manufacturing process of the feeding electrode. Comparison of discharge energy and crater size between the current and the new feeding capacitance will be made. Continuity of discharges within the pulse train duration will be observed.
