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A pattern is shaken by striking it with a wooden piece. A negative allowance is provided for this. Which allowance is it?

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in Casting-Forming-Welding I by (687k points)
A pattern is shaken by striking it with a wooden piece. A negative allowance is provided for this. Which allowance is it?

(a) Machining Allowance

(b) Rapping Allowance

(c) Distortion Allowance

(d) Contraction Allowance

The question was asked during an online exam.

The question is from Pattern Allowances in chapter Preventive Maintenance in Foundries & Metal Casting Process of Casting-Forming-Welding I

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Best answer
Right option is (b) Rapping Allowance

Best explanation: In rapping or shake allowance, the pattern is taken out of the mould and it is rapped or shaken, so as to free it from the adjoining sand. Due to this, there may be a little increase in the size of the mould cavity.

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