Workshop Technology
A ring gauge is used to

Check the clearance between two mating surfaces
Check the diameter of shafts or studs
Test the accuracy of holes
All of these

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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
Deliver molten metal into the mould cavity
Feed the molten metal to the casting in order to compensate for the shrinkage

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