Workshop Technology
Green sand is a mixture of

70% sand and 30% clay
90% sand and 10% clay
30% sand and 70% clay
50% sand and 50% clay

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Workshop Technology
The diaphragm moulding machine is used to

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

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