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

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

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Workshop Technology
Swab is used for

Cleaning the moulding sand
Smoothing and cleaning out depressions in the mould
Reinforcement of sand in the top part of the moulding box
Moistening the sand around the edge before removing pattern

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Workshop Technology
Lancing is the operation of

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
Cutting a sheet of metal in a straight line along the length
Bending a sheet of metal along a curved axis

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