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

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

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Workshop Technology
Notching is the operation of

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
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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