The non-traditional machining process that essentially requires vacuum is

electron beam machining

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electro chemical machining

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electro chemical discharge machining

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electro discharge machining

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Solution

The correct option is A electron beam machining
Electron beam machining requires a vacuum chamber and therefore collision of accelerated electrons is avoided with the air molecules to obtain fine machining.

Suggest Corrections

	Machining process		Manufacturing Processes
P.	Chemical machining	1.	Erosion
Q.	Electro-chemical machining	2.	Corrosive reaction
R.	Electro-discharge machining	3.	Ion displacement
S.	Ultrasonic machining	4.	Fusion and vaporization