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A draft allowance is provided to ___________

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A draft allowance is provided to ___________

(a) All linear faces

(b) Only the interior dimensions

(c) Only the exterior dimensions

(d) Only the dimensions that are perpendicular to the parting plane

I got this question by my school teacher while I was bunking the class.

The above asked question is from Difference between Pattern and Casting in division Pattern and Pattern Making of Casting-Forming-Welding I

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The correct choice is (d) Only the dimensions that are perpendicular to the parting plane

Easiest explanation: The draft allowance is used for those dimensions which are perpendicular to the parting plane, to give out a tapered face which is machined later.

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