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After providing the finishing allowance to the metal casting, it is not necessary to include shake allowance as it can be covered by finishing allowance.

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After providing the finishing allowance to the metal casting, it is not necessary to include shake allowance as it can be covered by finishing allowance.

(a) True

(b) False

I had been asked this question at a job interview.

Origin of the question is Finishing Patterns & Storing of Patterns topic in division Pattern and Pattern Making of Casting-Forming-Welding I

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The correct option is (b) False

Explanation: The purpose of shake allowance is totally different and opposite from finishing allowance. Shake allowance includes reducing of pattern dimensions, before implementing this, the casting made is generally large that is caused by the pattern removal which enlarges the mould cavity. So, shake allowance is provided, it is also called a negative allowance.

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