Manufacturing And Production Technology
The example of snag grinding is

All of these
Grinding the parting line left on castings
Removing flash on forgings
Trimming the surface left by spruces and risers on castings

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

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

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