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

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

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Manufacturing And Production Technology
Glazing in grinding wheels can be decreased by

Using a softer wheel or by increasing the wheel speed
Using a harder wheel or by decreasing the wheel speed
Using a softer wheel or by decreasing the wheel speed
Using a harder wheel or by increasing the wheel speed

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