Workshop Technology
The diaphragm moulding machine is used to

Give uniform sand hardness throughout the mould
Ram the sand harder at the back of the mould and softer on the pattern face
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

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Workshop Technology
Riddle is used for

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

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