Although there are many special forms of electrical discharge machining, the industrial electrical discharge machining is usually summed up in three categories. Next, I will introduce three types of EDM machine tools to you.
The three types of EDM machine tools are forming discharge machining, wire EDM and EDM small hole processing. The principle of discharge erosion of them are the same, which are found in 1770 by Joseph Priestley, however,their methods and applications are obviously different.For more details, please refer to classification of EDM.
The main advantages of EDM are its excellent surface finish quality, minimal heat-affected zone, and the ability to cut sclerosing material and superalloy,which makes it an ideal choice for the processing of specific holes.