Pushing work w/ threaded rod + hand crank
Pushing work w/ threaded rod + hand crank
(OP)
I'm kind of having a brain fart here. I'm trying to design a fixture that can push/pull work by using a long screw + hand crank. The screw is threaded into a stationary block and at the end of the screw is the work piece that needs to move back and forth. What I am having trouble visualizing is how the screw can attach to the work piece by means of some swivel action so the screw just pushes/pulls the piece and doesnt attempt to rotate the work piece while also being capable of pushing/pulling with at least 100 lbf. A normal screw and thread should be able to handle that force but the means of connecting the screw to the work piece is what I cant visualize.





RE: Pushing work w/ threaded rod + hand crank
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RE: Pushing work w/ threaded rod + hand crank
Do you know how receptive the work-piece is to attachments (does it have a handy ferrous pad that could take a magnetic mount, or stud holes in just the right place), whether the device is going to have to support the weight of the work-piece, whether it will need to stop it tipping as well as pushing it and whether there is something to react the friction forces in the bearing (because otherwise the work-piece will still be prone to spinning)?
A.
RE: Pushing work w/ threaded rod + hand crank
Say your threaded rod is 5/16" You get a 5/16" bolt and a nut and a threaded standoff, like: https://www.mcmaster.com/#standard-threaded-hex-st...
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RE: Pushing work w/ threaded rod + hand crank
Anything you screw onto/into the end of the shaft will unscrew itself quite quickly as soon as you try to pull the load. In fact, anything with a threaded connection is a bad idea.
There will always be some torque transferred from the screw to the workpiece. If the workpiece is just hanging off the end of the screw it's gonna spin.
-handleman, CSWP (The new, easy test)
RE: Pushing work w/ threaded rod + hand crank
RE: Pushing work w/ threaded rod + hand crank
Have a look how a bench vice works.
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RE: Pushing work w/ threaded rod + hand crank
RE: Pushing work w/ threaded rod + hand crank
RE: Pushing work w/ threaded rod + hand crank
RE: Pushing work w/ threaded rod + hand crank
Got an OEM jack in your car for tire changing ? If it is some variation of a scissors jack, there will be some thrust bearings of varying complexity, retained in in various ways.
RE: Pushing work w/ threaded rod + hand crank
RE: Pushing work w/ threaded rod + hand crank
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RE: Pushing work w/ threaded rod + hand crank
https://www.google.com/search?q=threaded+shaft+col...