Workshop Technology
A pattern maker's shrinkage rule considers

All pattern allowances
All materials of the pattern
Only shrinkage allowance
All materials to be cast

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Workshop Technology
The diaphragm moulding machine is used to

Give uniform sand hardness throughout the mould
Produce uniform packing of sand in 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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