Workshop Technology
Metal patterns are used for

Small castings
Complicated castings
Large castings
Large scale production of castings

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Workshop Technology
The diaphragm moulding machine is used to

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