Workshop Technology
Aluminium is the best material for making patterns because it is

Light in weight
Easy to work
Corrosion resistant
All of the listed here

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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
Delivers molten metal from pouring basin to gate
Feed the molten metal to the casting in order to compensate for the shrinkage

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Workshop Technology
Notching is the operation of

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

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