Manufacturing And Production Technology
Threading is an operation of

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

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Manufacturing And Production Technology
Which of the following statement is incorrect with reference of lathe cutting tools?

The flank of the tool is the surface or surfaces below and adjacent to the cutting edges
The base is that surface of the shank which bears against the support and takes tangent pressure of the cut
The heel is that part of the tool which is shaped to produce the cutting edges and face
The nose is the corner, arc or chamfer joining the side cutting and the end cutting edges

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