How to make a Revolute joint between two componennts at a certain distance?
Try this:
- Make four spheres in separate componets: One Sun, one Sun core, one Earth, one Earth core. Use one sketch with multiple diameter concentric circles (Use the joints to position the components). Use the Revolve command to create each component.
- Make a rigid joint between the Sun and
the Earththe Earth core. - Make a revolute joint between the Sun and the Sun core.
- Make a revolute joint between the Earth and the Earth core.
Do a motion study.
ETFrench
Actually it can be done in a simple way
First, create a sketch with the main root activated ( main root = the main component in the browser ) so that you can use joint origins in place for each component, because if you create a joint origin using the component itself, the join origin will appear inside of the used component browser, so it won't work.
Second, apply joint origins to that created sketch, which in this case as i mentioned, these joint origins won't be a part of any sub-component.
Then, apply a joint command on the 1st component (earth), and an As-Built Joint on the second one (moon).
And in the end, use a motion link to specify how fast each component rotate when you animate the model.
Here is a file with the steps i mentioned applied.
Saeed Hamza
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If I've got your idea right, you proposed to use sketch as a links between objects?
I created the sketch in the root of the project with needed links. And the sketch itself animated properly!
And even more: I was able to join a component to a sketch vertex.
However, component can be moved among the joint only. I can't make any movement to the sketch by moving component joined to sketch.
Did I understand everything right?
You need 3 components, the origin, (File default)
the sketch and
the block.
The sketch revolves around the origin.
The block revolves around the sketch endpoint. (done)
Might help....
@davebYYPCU That's assuming he has only 1 component to move, but adding another component to this as an Earth/Moon example, it would need more to it than that
@r.a.matveev When I replied above, I didn't notice you wanted the center component (Earth) to move around it's axis as well, it's still can be applied, but a bit more complicated
Attached you'll see a video of a Model Animation, also .f3d file to check everything
Saeed Hamza
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@r.a.matveev From what I see, what I attached is exactly what you are talking about, 1 rotation around the each component's axis, that's 2 rotations, and the rotation of the earth around the sun ... these are the 3 movements, so i need to ask, what exactly do you mean by one degree freedom???
Saeed Hamza
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@r.a.matveev I believe that you missed an important thing in what i mentioned so far, and that is Motion Link.
Here, I attached the same file you attached in your last reply, but I edited it so that it has Motion Links applied to it, so try the command "Animate Model" to see that it's working.
You can see it in the timeline as 2 motion link icons, so take a look at them carefully to understand the need for 2 motion links in this to make it work.
Saeed Hamza
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Unfortunately, I've already deleted it.
It had four revolute joints:
- Earth to earth core
- Sun to sun core
- Earth core to base (Joint offset in X, Y, or Z direction)
- Sun core to base
And two motion links (IIRC, you may need to experiment here):
- Between #1 and #3
- Between #3 and #4
Notes:
- Joints #1 and #2 can revolve around any axis, but this needs to be set before creating the motion links.
- Joint origins can be in hidden bodies or sketches.
- With spheres, the center is automatically selected for the joint origin. Other shapes can have more than one location for joint origins.
- The sun, sun core, and base origins are coincident.
ETFrench
Judging from @etfrench attached video, by 1 degree you mean rotating around only 1 axis and you need the earth to rotate around the sun around x,y and z axis? also each has it's own rotation direction?
Saeed Hamza
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