These are used to transmit power in screw operated machines such as lathe machine, shaper, milling machine and screw jacks etc.
Power screws are used to convert rotary motion into linear motion.
A power screw should be made with the material having high resistance to wear and tear.
The power screws should be strong enough to with-stand tensile, shear and compressive loads easily.
The following threads are used for power transmission.
1: Square thread.
2: Acme thread.
3: Buttress thread.
The square thread has maximum efficiency to transmit power in both directions.
This thread is difficult to manufacture. For larger lea and efficient operation multiple threads are used. Acme thread is slightly less efficient as compared to square thread.
This thread is easy to manufacture and it is stronger at root area.
The buttress thread is used to transmit power in single direction only.
This thread is used on the spindles of vices i.e. Wood working vice.
No comments:
Post a Comment