Roller bearing motion
You are mixing your types of bearing, one place you say Roller Bearing then in another your talk about Balls in your bearing. I went with the Ball Bearing. You can cut your work in half by downloading a ball bearing from McMaster-Carr that has ball cages. You can used them to quickly create your required joints and then hide them in the assembly. A Motion Link to half the rotation speed between the race and the balls makes it more realistic. I have attached my model.
John Hackney, Retired
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Hi,
I would strongly recommend that you do the embedded tutorials in the Fusion Documentation and also some of the
Self-Paced Learning to help you to learn fusion faster and better. They can be found here:
It is also much easier for the forum to help you if you attach your file AND a screenshot of what you want to achieve
and what the problem is. You can create a file to export like this:
Time spent on the tutorials and self paced learning will not be wasted.
When designing, it is much simpler to use a simple joint instead of an assembly. While @jhackney1972 has a good point
about inserting a McMaster-Carr component if you were actually designing a more complex assembly like a drive it is
a good solution. The problem with inserting many of these external parts is that it can cause fusion to lose
performance. It is similar in say, modeling the threads on a fastener, you can do it but it will affect performance.
The question to ask yourself is what am I trying to achieve? I can model everything right down to the washer on a bolt
and it will work and I can test it. Or I can assume that a bolt is going to be used but just use a simple joint instead to
represent what the bolt and washer assembly will do. I mention this because having a full bearing like the one that
John has used is representative of the real world but all you wanted to demonstrate was a Revolute joint.
For just learning about joints, I would keep it simple to start with. Once you get your head around it then set them
homework to model a bearing and see what happens.
Cheers
Andrew
The motion @jhackney1972's model shows is only half of the motion of the ball bearing.
It shows how the outter bearing race moves around the inner race. It shows how the balls move around the center of the bearing race(s)
It des not show the actual rotation of the bearing balls around their center-of-mass axis.
The latter is a bit more difficult to achieve with that particular model. Usually the origin of a sphere would be centered in the sphere. However in this case that isn't so, so the model requires some modifications.
The blue highlighted sphere is the geometry of the ball component and it isn't centered around the origin.
