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

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

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Workshop Technology
In permanent mould casting method

Molten metal is poured in a metallic mould, retained in the mould long enough for the outer skin to solidify and finally mould is turned over to remove molten metal still in molten condition
None of these
Molten metal is poured and allowed to solidify while the mould is revolving
Molten metal is forced into mould under high pressure

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