Problem NO: 19

In a chemical milling operation on a flat mild steel plate, it is desired to cut an ellipse-shaped pocket\nto a depth of 0.4 in. The semiaxes of the el

In a chemical milling operation on a flat mild steel plate, it is desired to cut an ellipse-shaped pocket

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to a depth of 0.4 in. The semiaxes of the ellipse are a = 9.0 in and b = 6.0 in. A solution of

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hydrochloric and nitric acids will be used as the etchant. Determine (a) metal removal rate in in3/hr,

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(b) time required to etch to depth, and (c) required dimensions of the opening in the cut and peel

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maskant required to achieve the desired pocket size on the part.

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