Discussion
Which type of thread is used in lead screw of lathe machine
Answer: C
The lead screw uses a trapezoidal thread.
A lead screw transmits motion and power to the carriage during thread cutting, so it needs a strong thread that engages a split (half) nut smoothly. The trapezoidal form, the metric equivalent of the Acme thread with a 30° included angle, is stronger than a square thread, easy to cut, and lets the half nut engage and disengage easily.
'Spur' describes gears, not threads. Every screw thread is a helix, so 'helical thread' names no particular form. A saw tooth (buttress) thread carries load in one direction only, but a lead screw has to drive the carriage both ways.
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