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What kind of allowance is seen in this figure?

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in Engineering Material & Metallurgy by (773k points)
What kind of allowance is seen in this figure?

(a) Drafting allowance

(b) Camber allowance

(c) Machining allowance

(d) Shrinkage allowance

I got this question during a job interview.

This interesting question is from Pattern Making topic in portion Testing of Materials, Foundry & Powder Metallurgy of Engineering Material & Metallurgy

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Correct choice is (b) Camber allowance

To explain I would say: The casting may distort or warp during cooking if it is an irregular shape. Due to this distortion, the casting may bend. To avoid this, the shape of the pattern is slightly bent into the opposite direction. This is the distortion or camber allowance.

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