Workshop Technology
The metal patterns as compared to wooden patterns require less

Draft allowance
Shrinkage allowance
Distortion allowance
Machining allowance

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Workshop Technology
In permanent mould casting method

Molten metal is poured in a metallic mould, retained in the mould long enough for the outer skin to solidify and finally mould is turned over to remove molten metal still in molten condition
Molten metal is poured and allowed to solidify while the mould is revolving
Molten metal is forced into mould under high pressure
None of these

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