Workshop Technology
A basic shaft is one whose

Upper deviation is zero
Lower deviation is zero
None of the listed here
Lower and upper deviations are zero

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Workshop Technology
The purpose of a gate is to

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

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