Manufacturing And Production Technology
Lapping 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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Manufacturing And Production Technology
Threading is an operation of

Smoothing and squaring the surface around a hole
Producing a hole by removing metal along the circumference of a hollow cutting tool
Sizing and finishing a small diameter hole
Cutting helical grooves on the external cylindrical surface

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