hi, i have one rotating joint (its an excenter) and a second one, which should go up and down together with the changing distance of the excenter. i tried to to it with a contact set, but it only rises the second part higher if the excenter gets in touch, but it doesnt follow back down (zero gravity;-). how can i synchronise these two joints that they follow each other???
@paul.kaiser, the short answer to your question is to use a Rest position on the joint. This is available on the Edit Joint Limits dialog:
This acts as kind of a "spring" setting for the joint - it will try to return to this rest position.
However, I would caution you against using contact sets for anything beyond a trivial model. The performance will probably be unacceptable, unfortunately. If possible, I would use Motion Link to relate the two joints together. You can usually mimic most simple mechanisms this way.
If you want to share your model here, someone will no doubt take a look at it.
Jeff
@paul.kaiser, thanks for the model and the video. I suspect that your joint system is correctly set up (at least I could not find a problem with it). That is a strange result. I've very often seen cases where Animate Model or Drive Joint works, but component drag does not. This is the first time I've ever seen a case where the opposite occurs. I would say that this is a solver bug. I will report it and have the solver team look into it. Thanks for the very detailed explanation, this is much appreciated! Sorry not to have a better answer...
Jeff
I don't understand why this one is a cylindrical, but changing to revolute breaks the model.
May be something there?
No timeline - I am stuck to test anything before the breakdown.....
thank you, jeff,
i made another version that you will find in the attachment that works a little bit better. i made some changes, e.g. i made a cutout at the lower part of the excenter column, as you can see on the screenshots below. i wonder if the animation maybe has problems if there occur physical contacts between the moving components? o thought, as long as there is no activated contact set, fusion should ignore that physical behaviour? i am not really shure but i had the impression it was one of the reasons why the animation didnt work. nethertheless there are still strange behaviours and i still cannot get it working in my "real" document. in this newer version here it is possible to animate linked motions when you animate either "Rev76" or "Rev90" (these are the two linked motions). But still it doesn't work if you try to animate M1, although it works if you drive the joint manually. so there is still something buggy there...
Is this the motion you are trying to create ?
I didn't to try to re-create the motion you sketched but simply went by the existing components are arranged in the design.
I can get this to work by assembling it slightly differently. Whether that's a bug not I don't know.
I suppressed a few joints and created new ones.
If you animate M1Achse it works.
