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markdensul7-Bedrock
7-Bedrock
July 24, 2025
Solved

Why does a pin connection physically link two parts during an analysis?

  • July 24, 2025
  • 1 reply
  • 876 views

I am using Creo Parametric Release 10.0 and Datecode10.0.3.0

Assembling one part with a pin connection to ground. Assembling a second part with a pin connection to the first part. There are no other connections between the two parts. Using a velocity motor the rotate the first part. When running the analysis, the second part rotates as well. It should stay still since there are no connections or forces / motors on it. Why does the second part rotate?

Best answer by markdensul

Hi,

 

Just an update -

Tried more things with the test assembly I provided.

The second disk only turns with a velocity motor applied to the first disk.

It does not turn when I apply an acceleration motor, a force load (to generate rotation), or a torque load on the first disk.

I will go ahead with my model having disk 2 connected to disk 1, since I am applying accelerations and forces, not a velocity.

Thanks!

 

 

1 reply

A
Abhiram_Pande14-Alexandrite
14-Alexandrite
July 25, 2025

Hi @markdensul 

 

Is it possible for you to share a sample file for better understanding and clarification.

 

Thanks, 

 

M
markdensul7-BedrockAuthor
7-Bedrock
July 28, 2025

Hi, sure, attached.

 

Thanks,

Mark

 

T
ToddKraft16-Pearl
16-Pearl
July 28, 2025

Hi Mark,

 

The rotation of disk2 occurs since you reference disk 1 to make the disk2 pin joint.  The rotation dof is open and it moves since disk1 moves.  If you assembly disk2 with a pin joint that only references the ground part...then it won't rotate.  

 

In addition, you can lock disk2 when defining the dynamic analysis with one of the 'Locked entities' methods.  Many options will work there.

 

Regards,

Todd Kraft

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