How to make a functional threads in an Assembly?
You can add an angle constraint (for rotation) and a Flush/Mate constraint for linear translation. The value of the Flush is a formula depending of the angle value. If you drive the angle >>you see<< the wished motions.
If you want to drag it with the mouse, you can include both parts in the contact set. To drag this with the mouse, you need a very very powerful computer. My laptop cannot cope with this challenge.
Another possibility is to add a tangent constraint between the both parts. To >>animate the mechanism<< drag the mouse. This is not very stable, but possible.
(I added a small hole to the screw for better viaualization of the rotational movement.)
BTW: It would be a good practice, to create the parts symmetrical (centered) to the origin planes.
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Jürgen Palme
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Hi.
You answer here gave me the solution to the first part of a problem I'm having. However, I still need help in the second part.
Lemme explain.
I'm modelling an assembly of a clamping system. I was having trouble getting the screw to move forward with every turn of the Tommy Bar. But on seeing your answer, I changed the relationship to a Motion > Rotation-Translation type of constraint. That solved the problem (1st part of problem), but brought up another problem - the motion is now really erratic/I can't drive the constraint (2nd part of problem).
If you look at the videos, in the first one, when I click drive, the Tommy Bar turns smoothly, but in the second one, the motion is erratic. It moves forward/backward with every turn, yes, but it's out of control. How do I make it move like in the first video, but with that type of joint?
I've tried changing the Distance field in the Place Constraint dialog, but the only difference is the lateral motion changes while the erraticness?/erraticity?/madness remains.
Thank you.
