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The shrinkage value given to the pattern must be _________ for the outer dimensions which are to be restrained.

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in Foundry and Forging by (110k points)
The shrinkage value given to the pattern must be _________ for the outer dimensions which are to be restrained.

(a) Lower

(b) Higher

(c) Equal

(d) Does not alter anything

I had been asked this question by my college professor while I was bunking the class.

My enquiry is from Patterns and its Functions topic in portion Casting Processes of Foundry and Forging

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Right option is (b) Higher

The explanation: In a dry sand core, the centre of the casting may restrain the casting from the contraction but the edges are not restrained. Thus, it is desirable to provide a higher shrinkage allowance.

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