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Which of the following is a major difficulty in the Electro discharge machining process?

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in Advanced Machining by (962k points)
Which of the following is a major difficulty in the Electro discharge machining process?

(a) Proper sparks

(b) Abnormal discharges

(c) Optimum feed rates

(d) No burr

The question was posed to me by my college professor while I was bunking the class.

This is a very interesting question from EDM-Process Control, Automation, Environmental Impact in portion Thermal Processes of Advanced Machining

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The correct choice is (b) Abnormal discharges

To elaborate: Avoidance of abnormal discharges has become a major difficulty in Electro discharge machining process.

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