Manufacturing And Production Technology
A bottoming tap has

Its end tapered for about three or four threads
None of these
Its end tapered for about eight or ten threads
Full threads for the whole of its length

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Manufacturing And Production Technology
Lapping is an operation of

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

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