Problem merging geometry successfully

Coreform Cubit Creation and Modification
#1

Hi,

I am looking for advice on how to merge a geometry successfully after imprint. Below is the output message that I get when I try to merge my geometry. When I use the find overlap command I can see that there are few surfaces between volumes that were not merged. Why does this happen?

Let me know if you have any advice on to solve this problem.

Thank you in advance,
Josimar

Cubit>imprint all
Group imprint finished.
WARNING: Unmerging Surface 36.
WARNING: Unmerging Surface 62.
Updated volume(s): 8, 9, 13, 35, 45, 47
IMPRINT completed.
Finished Command: imprint all

Cubit>merge all

...Merging all features in the model

...Merging all Surfaces in the model
Consolidated 50 pairs of surfaces

...Merging all Curves in the model

WARNING: Attempting to merge two entities with same parent.
  Vertex 39 (Vertex 39) and Vertex 953 (Vertex 953)
Check for sliver geometry in the vicinity

WARNING: Attempting to merge two entities with same parent.
  Vertex 940 (Vertex 940) and Vertex 941 (Vertex 941)
Check for sliver geometry in the vicinity

WARNING: Attempting to merge two entities with same parent.
  Vertex 942 (Vertex 942) and Vertex 943 (Vertex 943)
Check for sliver geometry in the vicinity

WARNING: Attempting to merge two entities with same parent.
  Vertex 942 (Vertex 942) and Vertex 943 (Vertex 943)
Check for sliver geometry in the vicinity

WARNING: Attempting to merge two entities with same parent.
  Vertex 940 (Vertex 940) and Vertex 941 (Vertex 941)
Check for sliver geometry in the vicinity
Consolidated 14 pairs of curves 

...Merging all Vertices in the model
Consolidated 0 pairs of vertices
All detected matches successfully merged
Finished Command: merge all
#2

Hi,

Just a quick follow up. I tried to use imprint tolerant to see if it can help, but I get the error below. Here I tried to increase the tolerance to 5e-3. What does the error below means?

Let me know if this helps.

Thanks,
Josimar

Cubit>imprint tolerant volume 9 12 tolerance 0.005
ERROR: ACIS API error number 78004 
ACIS API message = Cannot create a wire with overlapping tvertices. 
ERROR: ACIS API error number 78004 
ACIS API message = Cannot create a wire with overlapping tvertices. 
Updated volume(s): 9, 12
Finished Command: imprint tolerant volume 9 12 tolerance 0.005
#3

Hi Josimar,

I will ask Spatial the exact meaning of this.

I know that “tvertices” are tolerant vertices. A “wire” is a topological representation for a curve. My guess would be that you have two vertices that are close to .01 units apart. ACIS attempted to create a curve/wire between them but the vertex tolerance overlaps but the vertices were far enough apart that they weren’t merged. You might try making the tolerance slightly larger.

Thanks,
Karl

#4

Hi Josimar,

ACIS support seems to indicate that this shouldn’t be happening. Can you send me a sat file of your model? If possible, isolate the surfaces that are causing the problem in the imprint. I will put together a formal error report for the ACIS support people.

Thanks,
Karl