Ball screw movement

[Anonymous]

Hello, I have already assembled parts to the ball screw. However, I am not sure how to move it up and down. Is anyone willing to help?

[Rob67ert]

Hi,
Do you like to have the "holdthearm" move up and down, or the "Ball Srew"?

The best way is to have one part grounded or fixed to the origin.

[TheCADWhisperer]

What happened to the dimensions in Sketch1 of the Ball Screw part file?

[WHolzwarth]

Hmm. A ball screw with 20x1 thread will never exist. I've changed to Tr20x4.

My sample is only theory, it can't be built this way.

Two new 2016 files attached, others are unchanged. Movement can be done by driving Winkel:1 (Angle:1).

Walter

[kpyoung333]

There are many ways to constrain the rods, you want to focus on limiting the degrees of freedom of the parts. You know the thread rod is going to be stationary with only the rotation wanted to be free. The claw arm will be aligned to a plane and concentric along the thread so it only has movement vertically and cannot rotate. There are many ways to calculate this but once you find a good ratio you can setup a Joint constraint or a Motion constraint (2nd Tab in constraint box). The hard part is finding the thread travel length per turn, I didn't bother to figure that out but setup a simple constraint you can right click on the constraint and select "Drive" to watch it work. You can suppress/delete the constraints and move it freely by hand to see how it goes. Play around with the constraints and see which ones can be driven. Once you get the hang of it you can go into the Environments tab > Inventor Studio > and then figure out how to create an animation video to show your vertical motion with thread turn. That is another beast though...

[Anonymous]

Yes, I want to make the ''holdthearm'' move up and down.