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

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

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Workshop Technology
Shift is a casting defect which

Occurs as sand patches on the upper surface of a casting
Results in a mismatching of the top and bottom parts of a casting
Occurs near the ingates as rough lumps on the surface of a casting
Results in general enlargement of a casting

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Workshop Technology
The purpose of a riser is to

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

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