Workshop Technology
The hot working of metals is carried out

Below the recrystallisation temperature
At any temperature
At the recrystallisation temperature
Above the recrystallisation temperature

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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
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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