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Which of the following materials are used as electrodes in EDM?

(a) Graphite

(b) Copper

(c) Brass

(d) All of the mentioned

The question was asked in final exam.

This interesting question is from EDM-Machining System in portion Thermal Processes of Advanced Machining

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The correct answer is (d) All of the mentioned

To explain: All the materials mentioned above, can be used as electrodes in Electro discharge machining.

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