Shrinkage allowances made by :
Adding to external and internal dimensions
Subtracting from external and internal
dimensions
Subtracting from external dimensions and adding to internal dimensions
Adding to external dimensions and subtracting from internal dimensions
Adding to external and internal dimensions
Shrinkage allowance is made by adding
to external and internal dimensions.
Shrinkage allowance :The various metals used for casting contract after solidification in the mould. Since the contraction is different for different materials, therefore it will also differ with the form or type of metal.
1– 2 : Liquid shrinkage
2– 3 : Solidification shrinkage
Hence, the correct option is (A).
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