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Pitch and roll are rotating around same axis on a ball joint.

7 REPLIES 7
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Message 1 of 8
spaceman_2298
174 Views, 7 Replies

Pitch and roll are rotating around same axis on a ball joint.

Pitch and roll are rotating around same axis on the ball joint.

Steps to reproduce:
1. Create an 'As built' ball joint.

2. Preview motion of pitch and roll and find that they are same.

 

7 REPLIES 7
Message 2 of 8

In the video I have locked the Ball Joint in the Yaw axis.  I then lock the Pitch and the Roll at separate times.  You can see clearly that the motion is not on the same axis.  If you are arguing the motion goes through the same pivot point, that is correct but the motions are not on the same axis.  Model is attached if you want to try it yourself.


"If you find my answer solved your question, please select the Accept Solution icon"

John Hackney
Retired

Beyond the Drafting Board


Message 3 of 8

see message #5 in this thread:  ball-joint-mysteries .

This one also has detailed information:  scratching-the-ball 


Jeff Strater
Engineering Director
Message 4 of 8

Thank you, John, for the reply. I find that the model you attached works as expected but the one I make has some trouble. I am attaching a demo model that has a problem. Am I missing something?

 

Message 5 of 8

I apologize for the late reply, I had to attend a get-together and I am just getting back to your post.  The reason you are getting two axis identical, in my opinion, is the Ball Joint was placed on the midpoint of the edge of the two components.  I replaced the joint with one on two points, basically the same position, just points not on the edge. 

When you are test any joint, using the Drive Joint command gives you a better picture.  Model I used in the video is attached.

 


"If you find my answer solved your question, please select the Accept Solution icon"

John Hackney
Retired

Beyond the Drafting Board


Message 6 of 8

Thank you, John, for the reply. Strangely, the model you have given also behaves oddly on my end. I tried creating a joint as suggested with no avail. Pitch and roll are oddly staying on same axis.

 

Message 7 of 8

I am at a loss, using my defined method I get three axis every time.  I hope someone else can give you more insight into your issue.


"If you find my answer solved your question, please select the Accept Solution icon"

John Hackney
Retired

Beyond the Drafting Board


Message 8 of 8
davebYYPCU
in reply to: spaceman_2298

You are not alone, if there is a fix in Jeff’s references, I missed it.

 

 

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