Manufacturing And Production Technology
In centreless grinding, work place centre will be

Above the line joining the two wheel centres
Below the line joining the two wheel centres
At the intersection of the line joining the wheel centres with the work place plane
On the line joining the two wheel centres

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Manufacturing And Production Technology
Trepanning is an operation of

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

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