While threading on a lathe, the carriage is moved by means of :

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Making a series of cuts in the same cut

Threads are cut on a lathe with a single point tool by making a series of cuts in the same cut.

Square thread

Square threads are used for transmitting motion or power. Eg. screw jack, vice handles, cross-slide and compound slide, activating screwed shafts.

Flanks

In a threaded assembly the contact between the male and female threads takes place on the Flank