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

Distortion allowance
Shrinkage allowance
Draft allowance
Machining allowance

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Workshop Technology
Swab is used for

Cleaning the moulding sand
Reinforcement of sand in the top part of the moulding box
Smoothing and cleaning out depressions in the mould
Moistening the sand around the edge before removing pattern

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