Workshop Technology
Cores are used to

Improve mould surface
All of these
Form a part of a green sand mould
Form internal cavities in the casting

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Workshop Technology
The purpose of a gate is to

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

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