Workshop Technology
Notching is the operation of

Bending a sheet of metal along a curved axis
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
Removal of metal to the desired shape from the edge of a plate

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Workshop Technology
The purpose of a gate is to

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

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