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What is the use of photo tool in Photochemical milling process?

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What is the use of photo tool in Photochemical milling process?

(a) Cleaning of work piece

(b) Protection of surface against etching

(c) Etching of part surface

(d) None of the mentioned

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

The above asked question is from PCM-Process Description topic in chapter Chemical Processes of Advanced Machining

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Correct answer is (b) Protection of surface against etching

To explain: In PCM, photo tool is applied as coating which act as stencil resist that protect the surface from etching.

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