Workshop Technology
Riddle is used for

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

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Workshop Technology
A jolt 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
Produce 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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