Moment Acting on a Power Screw
Moment Acting on a Power Screw
(OP)
Hi,
I have a power screw that closes a scissor like mechanism. The tapped portion which acts as the nut inflicts an axial force against the motion of the screw, however, the force originates below the axis of the screw, therby creating a moment at the center of the screw. I have been running the equations for calculating the required torque to move the load axially, but I am unsure how to account for this moment on both the nut and screw threads. It seems clear that this moment has an impact on the required torque but for the life of me I cant clearly see how to account for it. Maybe I've had too much coffee. Any help or guidance would be appreciated! Thanks!
I have a power screw that closes a scissor like mechanism. The tapped portion which acts as the nut inflicts an axial force against the motion of the screw, however, the force originates below the axis of the screw, therby creating a moment at the center of the screw. I have been running the equations for calculating the required torque to move the load axially, but I am unsure how to account for this moment on both the nut and screw threads. It seems clear that this moment has an impact on the required torque but for the life of me I cant clearly see how to account for it. Maybe I've had too much coffee. Any help or guidance would be appreciated! Thanks!





RE: Moment Acting on a Power Screw
I don't have access to my copies at the moment, and am not sufficiently motivated to derrive the equations on my own.
It would seem far simpler to run a quick test, which would more accurately capture the specifics of your application.
RE: Moment Acting on a Power Screw