1. Why is the tool insulated in the ECM schematic?
2. What is the nature of the surface obtained by electro discharge machining (EDM)?
3. What is the principal advantage of using a moving wire electrode in electro discharge machining?
4. What effect would increasing the voltage have on the metal removal rate in electro discharge machining? Why?
5. If a metal part is quite brittle and the part will be subjected to repeated tensile loads, would you select ECM or electro discharge machining for making it? Why or why not?
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