Workshop Technology
Notching is the operation of

Removal of metal to the desired shape from the edge of a plate
Cutting a sheet of metal in a straight line along the length
Cutting a sheet of metal through part of its length and then bending the cut portion
Bending a sheet of metal along a curved axis

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Workshop Technology
The purpose of a gate is to

Delivers molten metal from pouring basin to gate
Delivers molten metal into the mould cavity
Feed the molten metal to the casting in order to compensate for the shrinkage
Act as a reservoir for the molten metal

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