Trouble with transitional constraint

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Trouble with transitional constraint

Anonymous
Not applicable

Hi,

I am trying to place the bolt so that it runs inside the slot on the curved rail. But I can't get the transitional constraint to work and it is difficult to place the bolt because of the curved surface of the rail. Any suggestions would be much appreciated.
constraint slot.png

 

 

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JDMather
Consultant
Consultant

@Anonymous wrote:

 Any suggestions would be much appreciated. 


Attach assembly here.


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Anonymous
Not applicable

Not sure how to attach files...

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johnsonshiue
Community Manager
Community Manager

Hi! You did not attach the complete files. The bolt subassembly including the bolt was not attached.

Many thanks!



Johnson Shiue (johnson.shiue@autodesk.com)
Software Test Engineer
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Anonymous
Not applicable

You're right! Here they are..

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johnsonshiue
Community Manager
Community Manager

Hi! This seemingly simple case actually requires a non-trivial solution. Please open attached file and go to Inspect tab -> turn on Contact Solver. You can slide the bolt along the slot.

The key here is to find how and what to establish constraint relationship. Unlike in real world, the washer sliding over the slot is very complicated movement to simulate. I created a small sphere surface at the bottom of the washer. You can take a look. Then I created a zero offset surface in the slot part. The transition is actually between the sphere and the offset surface. Other constraints are added to stablize the system. Otherwise, the bolt can move and rotate around freely. Please take a look at the files and let me know if more information is needed.

Many thanks!



Johnson Shiue (johnson.shiue@autodesk.com)
Software Test Engineer

WHolzwarth
Mentor
Mentor
 Here' an improved version of Johnson's IAM. I've added an angular limit for the movement in the slot.
 
 
 
 
Only new IAM is attached, all other files are unchanged.

Walter Holzwarth

EESignature

Anonymous
Not applicable

Thanks so much for the solution! I never would have figured that out. One question; how did you make the zero offset surface in the slot part? I can't seem to pick the curved surface with the "Offset from plane" function.

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Anonymous
Not applicable

Thanks a lot!

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johnsonshiue
Community Manager
Community Manager
Accepted solution

Hi Anna,

 

For the zero-offset surface, you need move EOP right under Sweep. It is because you want the offset surface without the slot. Then use Thicken command, set output to Surface, select the inner face, and set distance to zero.

Many thanks!



Johnson Shiue (johnson.shiue@autodesk.com)
Software Test Engineer

Anonymous
Not applicable

Ah okay, I got it now. Thanks a lot!

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