Workshop Technology
In order to get uniform thickness of the plate by rolling process, one provides

Antifriction bearings
Camber on the rolls
Hardening of the rolls
Offset on the rolls

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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 back of the mould and softer on the pattern face
Produce uniform sand hardness throughout the mould
Ram the sand harder at the pattern face with decreasing hardness towards the back of the mould

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