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A
avijayakumar1-Visitor
1-Visitor
November 11, 2015
Solved

I am unsure what constraints to use to satisfy a general model to simulate servo movement in Creo.

  • November 11, 2015
  • 2 replies
  • 2472 views

I have tried several different methods of constraining the whole robot but I still run into this error. Please advise.

important picture.PNG

    Best answer by sm_01

    Hi, I was able to open the models you supplied and noticed your first component in the assembly has no constraints. This is a critical problem. You CANNOT leave the first component in the assembly unconstrained. I tried changing it to be Default, but then the location of many other components becomes jumbled up. I tired to set the first component to FIX constraint, which would keep it in its current location, but many of the components in the arm assembly become jumbled up.

    My suggestion would be to go through the assemble one-by-one, starting at the first component to ensure all the components are assembled with proper constraints. There are many components in this assembly that are not properly constrained which is causing the parts to move around and the mechanism to fail. You will not be able to use Mechanism mode on this model until all the placement issues are resolved.

    first_component.jpg

    2 replies

    S
    sm_011-Visitor
    1-Visitor
    November 11, 2015

    It sounds like you have some conflicting kinematic constraints in your assembly. If you are not sure where they are, I would start rolling back the model to try and pinpoint the problem. In Creo Parametric, click on the Configure Tree icon above the model tree and check mark Features if it is not already checked. Now you should see the red arrow in the model tree. Drag this arrow UP in the model tree to temporarily suppress newer items. Try rolling back half way and see if the problem component is removed by going to Mechanism mode.

    Another tip, make sure the Suppressed Items is checked in the model tree configuration. That will allow you to bring back components one at a time to try and find which one is causing the problem.

    creo_assy_constraints.jpg

    S
    sm_011-VisitorAnswer
    1-Visitor
    November 30, 2015

    Hi, I was able to open the models you supplied and noticed your first component in the assembly has no constraints. This is a critical problem. You CANNOT leave the first component in the assembly unconstrained. I tried changing it to be Default, but then the location of many other components becomes jumbled up. I tired to set the first component to FIX constraint, which would keep it in its current location, but many of the components in the arm assembly become jumbled up.

    My suggestion would be to go through the assemble one-by-one, starting at the first component to ensure all the components are assembled with proper constraints. There are many components in this assembly that are not properly constrained which is causing the parts to move around and the mechanism to fail. You will not be able to use Mechanism mode on this model until all the placement issues are resolved.

    first_component.jpg

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