What is use of front screw contained by lathe Machine ?

lead screw help's to move the carrage by auto feeding (i.e. surrounded by step turning and threading op.) and auto feed's the cross slide in y axis. (i.e. facing op). simply it move the tool in x and y axis within desire auto feed.
The lead screw moves the turret by a precise increment for every rotation of the screw. This allows the contraption to generate threads in a workpiece, to generate precise length and diameter dimensions, and to maintain a constant rate of metal removal. Source(s): Manufacturing obtain

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