Multiple Animations

larry_reader

Hello,
Can't find the trick.
I have 2 animations a Revolute and a Slider working properly in an assembly. I just want them both to animate at the same time.
How do I do that?
Thanks

john_mcclary

Rack and pinion relation is the relative motion between a linear motion and a rotation.

All relations only affect existing mates.

You will need to set up a part on a slider (or cylindrical) mate.
The other part will need a revolute (or cylindrical) mate.

then you select the two mates in the rack in pinion relation dialogue, then set the relationship. "For every (1) rotation, I will move (200mm)"

john_mcclary

With a little bit of trickery...

What I do is create a separate slider to animate, then have that slider push some pieces along a curvy path. When the piece follows the curve up, use a slider mate with a relation to drive your actual part...
Each curve will drive the position of each mate.
In the ref image below, there are three mates being animated, 2 are stationary for this moment in time. while the 3rd is moving in a positive direction, in this case, a clockwise rotation somewhere in the assembly.


Hard to explain in short hand.

Look at the videos towards the end of this forum post, and I give deeper explanations.
There was a webinar about this somewhere too, but I don't remember the title off hand.
https://forum.onshape.com/discussion/10484/rubiks-cube-mate-animation

larry_reader

Thanks John but I think I'm at a different learning phase here. Looking at this
https://cad.onshape.com/help/Content/materelation-rackandpinion.htm?cshid=materelation_rack_and_pinion
Still missing some key bits. When I set up a Rack and Pinion Relation I get a constraints error. When I drag something the parts move instead of the animation occurring. In the video's there is this drag to animate thing going on. 

john_mcclary

Rack and pinion relation is the relative motion between a linear motion and a rotation.

All relations only affect existing mates.

You will need to set up a part on a slider (or cylindrical) mate.
The other part will need a revolute (or cylindrical) mate.

then you select the two mates in the rack in pinion relation dialogue, then set the relationship. "For every (1) rotation, I will move (200mm)"

larry_reader

Thanks again John, Yea I have that. Actually doing a right click > Animate on the Revolute mate gets me a constraint error. Just discovered by accident that doing an Animate on the Slider mate and it actually works, kind of. Ok some progress. When I edit the mates the way I want with limits again I get a constraint error. Will keep poking around at it.

john_mcclary

Ok, so if you are that far, then that could mean you have limits set, and the animation would be going beyond the limit of the slider mate..

in the animation dialogue you will need to set the distance to be lessthan or equal to the slider's limit.

(HINT: sometimes you need to give a negative value )