Workshop Technology
The machining allowance provided on patterns depends upon

Type of casting metal
Size and shape of casting
Method of casting used
All of these

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Workshop Technology
A jolt machine is used to

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

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