Correct option is D
The
lead screw of a lathe is typically made with
square threads because they provide high efficiency in power transmission and are ideal for translating rotational motion into linear motion. Square threads are preferred for lead screws due to their:
Low friction.
High load-carrying capacity.
Ability to transmit power smoothly in both directions.
ACME thread it is modification of square thread or trapezoidal thread used to lead screw of lathe.
The lead screw is used for thread cutting. It is made from good quality alloy steel and is provided with acme thread or square thread both. Worm thread is used for provide high reduction ratio.
