Manufacturing And Production Technology
The example of snag grinding is

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

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Manufacturing And Production Technology
Trepanning is an operation of

Smoothing and squaring the surface around a hole
Making a cone-shaped enlargement of the end of a hole
Producing a hole by removing metal along the circumference of a hollow cutting tool
Sizing and finishing a small diameter hole

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