How do I fix a part that has this plane appearing?

[leoheck]

Hello folks, I have this issue with a part where a plane is appearing out of nowhere.

I tried some operations adding material and then removing material but I could not fix this issue.

Any ideas on how do I fix this part?

Thanks in advance.

Code: Select all

OS: Ubuntu 22.04.1 LTS (ubuntu:GNOME/ubuntu)
Word size of FreeCAD: 64-bit
Version: 0.21.30430 (Git) AppImage
Build type: Release
Branch: master
Hash: 9e1ed4a68ad43309c2b38f7f5efbb1feac4323cb
Python 3.10.6, Qt 5.15.4, Coin 4.0.0, Vtk 9.1.0, OCC 7.6.3
Locale: English/United States (en_US)
Installed mods: 
  * Part-o-magic.backup1662467294.9039905
  * A2plus 0.4.59
  * Curves 0.5.8
  * fasteners 0.4.6
  * lattice2 1.0.0
  * Assembly4 0.12.4
  * kicadStepUpMod 10.15.1
  * Help 1.0.3

[Roy_043]

Where the rectangular face meets the solid there are two edges. One is a circle, the other a B-spline. They are almost superimposed, but not quite. I suspect that is the cause of the rogue face. How this came about is hard to tell with only a shape without any history.

[leoheck]

Yeh, this part has no history at all. But the cause is not a big deal for me.

Do you know a possible fix for that?

[leoheck]

For instance, online, on GrabCad. It does not have issues at all. Maybe Freecad is interpreting something extra, here. Or maybe GrabCad is ignoring something.

Screenshot-20220927154225-459x406.png (45.4 KiB) Viewed 473 times

[leoheck]

This one is a second test.

Tube-v2 was another try to fix this.
Then with Part Design, I could fix it.
But then when creating a simple copy of it, it creates this face.

Side by side comparison

On the left we see the part design version of it. On the right, the simple object created with the one fixed in Part Design.

gnome-shell-screenshot-6kwg3a.png (43.8 KiB) Viewed 465 times

[Roy_043]

The easiest solution is to cut away a very thin layer from the outside with a Part_Tube and Part_Cut.

[Syres]

Hello folks, I have this issue with a part where a plane is appearing out of nowhere.

This is a perfect example of why we repeatedly ask for the FULL INFO, if you had done this it would have been mush easier to show that the version of OCCT is the root cause.

Works fault free using:

Code: Select all

OS: Linux Mint 20.3 (X-Cinnamon/cinnamon)
Word size of FreeCAD: 64-bit
Version: 0.21.30479 (Git)
Build type: Release
Branch: master
Hash: 5a14ff96f4e2ba139382672dc34ca236f3b361dc
Python 3.8.10, Qt 5.12.8, Coin 4.0.0, Vtk 7.1.1, OCC 7.3.0
Locale: English/United Kingdom (en_GB)
Installed mods: 
  * ThreadProfile 1.83.0
  * A2plus 0.4.59
  * Curves 0.5.8
  * ExtremeProDark 1.0.4
  * Plot 2022.4.17
  * fasteners 0.4.6
  * sheetmetal 0.2.57

Fails using:

Code: Select all

OS: Linux Mint 20.3 (X-Cinnamon/cinnamon)
Word size of FreeCAD: 64-bit
Version: 0.21.30479 (Git)
Build type: Release
Branch: master
Hash: 5a14ff96f4e2ba139382672dc34ca236f3b361dc
Python 3.8.10, Qt 5.12.8, Coin 4.0.0, Vtk 7.1.1, OCC 7.6.3
Locale: English/United Kingdom (en_GB)
Installed mods: 
  * ThreadProfile 1.83.0
  * A2plus 0.4.59
  * Curves 0.5.8
  * ExtremeProDark 1.0.4
  * Plot 2022.4.17
  * fasteners 0.4.6
  * sheetmetal 0.2.57

See the difference????

[adrianinsaval]

I doubt grabcad uses occt, is it originally a step file? could be a bug during import or just a bad file. As for fixing, I suggest cutaway the buggy section and redo:

lala.FCStd

(188.61 KiB) Downloaded 13 times

it still has a lot of geometry check errors though.

[domad]

....

Hi leoheck, hello to the Community!

- Wb "Part"
- select "Skeleton-YB1.1-Top_Bottom_Complete_Clean"
- "Part" menu -> Compound -> Explode compound

[Roy_043]

Another easy solution:
Use the "set Tolerance value" button from the Defeaturing_Workbench.