Creo Elements/Pro - Difficulty Meshing Top Level Assembly
Creo Elements/Pro - Difficulty Meshing Top Level Assembly
(OP)
Hello,
I am using Creo Elements/Pro to build a Mechanica model of a large assembly. I am able ot mesh all the sub-assemblies and parts successfully. However, the top level assembly fails to mesh. The diagnostis window of AutoGEM lists a bunch of edges all belonging to a single part and gives me the error
"AutoGEM has detected an element incompatibility across the highlighted curve. Adding points to the curve may help. In some cases, re-creating the curve and adjacent
surfaces may be required. Could not complete creating elements
on all of the selected entities."
Has anyone in the community encountered this error? How can I resolve it.
Thank you very much.
I am using Creo Elements/Pro to build a Mechanica model of a large assembly. I am able ot mesh all the sub-assemblies and parts successfully. However, the top level assembly fails to mesh. The diagnostis window of AutoGEM lists a bunch of edges all belonging to a single part and gives me the error
"AutoGEM has detected an element incompatibility across the highlighted curve. Adding points to the curve may help. In some cases, re-creating the curve and adjacent
surfaces may be required. Could not complete creating elements
on all of the selected entities."
Has anyone in the community encountered this error? How can I resolve it.
Thank you very much.





RE: Creo Elements/Pro - Difficulty Meshing Top Level Assembly
Hope that helps and good luck,
- J -
RE: Creo Elements/Pro - Difficulty Meshing Top Level Assembly
This is just a linear static analysis that I am trying to perform with several load cases. However, at this point, I am just trying to get the top level model to mesh. I have not applied any of the loads and constraints yet. Also, I have used both "end weld" features and manually created welds in the top level assembly and sub-assembly levels to capture all the connectivity details. The overlapping surfaces are treated as "free", and there is no contact defined. Connectivity is through "bonded" interfaces through the welds.
The top level tolerance report shows quite a spread. The highest part tolerance is 4.77 mm and the lowest part tolerance is 0.07 mm. All the parts have "Accuracy Type" set to "Relative" and "Accuracy Value" is set to the same for all parts (by default). I have tried changing the "Geometry Tolerance Setting" at the top level to "Absolute" and played with different numbers without any luck. I have also tried to change the part accuracy. Some parts fail to regenerate when I change their accuracy.
What would be an easy way to fix this?
Thanks again!
RE: Creo Elements/Pro - Difficulty Meshing Top Level Assembly
My advice is to set the part accuracies (on the part level not the assembly level) lower for the larger models and higher for the smaller models. This will bring the two closer together when viewing the tolerance report on the assembly level. As you stated above there is a drastic difference between the two extremes of your models. Bottom line for me there was no real easy way other than to grind through it by changing the part accuracy and redefining failed features until the model regenerates and then prevent the problem on a go forward basis.
I would advise also to be careful with the "weld features" you mention as in mechanica they are not viewed the same as a conventional weld. The welds in mechanica are used for treating how mechanica extends shell elements during compression. They are not the same as take part A and weld it to part B. That is what the "bonded" interfaces are for. Forgive me if I am misunderstanding your application and sound as if I am telling you what you already know.
Hope that helps and good luck,
- J -
RE: Creo Elements/Pro - Difficulty Meshing Top Level Assembly
Company-wide change to set the default accuracy to "absolute" might take a while.
However, when I tried to manually change the tolerance of parts to absolute, as I move bottom up, my sub-assemblies (which were meshing fine with the "relative" accuracy), failed to mesh.
I am not using the weld features to create 2-D welds. All the parts are solid models. The "End Weld" feature within Creo is an easy way to extend one part to another, instead of one having to create solid models for butt and groove welds. It creates 3-D solid elements within Mechanica.
RE: Creo Elements/Pro - Difficulty Meshing Top Level Assembly