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

Draft allowance
Shrinkage allowance
Machining allowance
Distortion allowance

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Workshop Technology
A jolt machine is used to

Produce uniform packing of sand in the mould
Produce uniform sand hardness throughout the mould
Ram the sand harder at the back of the mould and softer on the pattern face
Ram the sand harder at the pattern face with decreasing hardness towards the back of the mould

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