Workshop Technology
A basic shaft is one whose

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

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Workshop Technology
The purpose of a riser is to

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

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