Manufacturing And Production Technology
The primary purpose of a sprue in a casting mould is to

Act as a reservoir for molten metal
Help feed the casting until all solidification takes place
Feed molten metal from the pouring basin to the gate
Feed the casting at a rate consistent with the rate of solidification

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Manufacturing And Production Technology
Glazing in grinding wheels takes place when the

Wheel is too hard and wheel revolves at very slow speed
Wheel is too soft and wheel revolves at a very high speed
Wheel is too soft or wheel revolves at a very slow speed
Wheel is too hard or wheel revolves at a very high speed

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