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ftorabi1-Visitor
1-Visitor
May 4, 2017
Question

Suppressed connections

  • May 4, 2017
  • 2 replies
  • 7076 views

Hi All

I am trying to simulate a gear mechanism. But I get this error :

The highlighted connections are not defined from two bodies, if you continue they will be suppressed


I have figured it out that the second axis of the rotation should belong to the assembly, and not the parts. is that right?

caus this creates a difficulty that you have to relocate your Assembly axis after defining your parts location. Is there another way around ?


and how could I resolve this suppression ?


Thank you very much

2 replies

J
jmoradiya1-Visitor
1-Visitor
May 4, 2017

Hello Farzad,

If I understand correctly, then you face this problem when you are switching from Parametric to Simulate. isn't it?

May be you can try this:

This issue occurs when the model is over constrained or some assembly references are lost (see video below)

  1. Highlight the part for which the connection is defined
  2. Right click and select > Info > Parent Child from the popup menu
  3. Suppress all children of this component and take the model into Pro/MECHANISM
  4. No error should be reported now.
  5. Start resuming the children one by one until the error appears again
  6. The child component causing the problem should be redefined so that all references belong to only one component

and refer this video

And if this does not help, then will you elaborate more about the model?

Best regards,

Jignesh

D
danderson1-Visitor
1-Visitor
May 4, 2017

Hi Torabi,

When defining a mechanism connection all references / constraints need to be between two parts only.

example:

rotation constraint:  between hole or axis in part A and in part B

Vertical Translation constraint: between flat surface or plane in part A and in Part B

Rotation orientation constraint: between flat surface or plane in part A and in Part B

Adding in a third component into the constraint set will lockup the mechanism.

Hope this help,

Don Anderson

F
ftorabi1-VisitorAuthor
1-Visitor
May 4, 2017

Thank you so much.

So if the part A is connected to the motor, and the part B is the follower, the part A should be inserted in the assembly tree , in a higher point regarding to part B ?

cause when I start defining positioning of one of the parts, I do not see the rest of the assembly and some of the planes and axes that I have created. so I am not sure how I can define the three indicated parameters between two parts

D
danderson1-Visitor
1-Visitor
May 8, 2017

Hi Farzad,

Yes.

When assembling and defining the mechanism constraints for part B, Part B can only reference one other component. So all of the references would all have to be to Part A or all to Part B. You are not allow to split the references between 2 components. (except you can use a rotational dimension reference like in a pin joint to a datum of another part or datum feature for the Zero degree reference)

Hope this helps,

Don Anderson

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