Strange jumping object - a bug or a user error?

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HeineMau
Posts: 2
Joined: Wed May 31, 2023 7:24 pm

Strange jumping object - a bug or a user error?

Post by HeineMau »

Hi,
I cannot really explain this, but the tip of one 'arm' jumps for no reason (I think)
Note the screenshots are the "FusionMat" and in the other case the elements in "FusionMat".
I did not expect the sphere to jump to another Z location :shock:
FreeCAD file attached.

Any comments are welcome.

BR
HeineMau


FreeCAD version info:

Code: Select all

OS: Debian GNU/Linux 12 (bookworm) (GNOME-Classic:GNOME/gnome-classic)
Word size of FreeCAD: 64-bit
Version: 0.20.2.
Build type: Release
Python 3.11.1, Qt 5.15.8, Coin 4.0.0, Vtk 9.1.0, OCC 7.6.3
Locale: English/Denmark (en_DK)
Installed mods: 
  * fasteners 0.4.56
  * ThreadProfile 1.85.0
Attachments
Jimmi_Holder_ver3.FCStd
(118.57 KiB) Downloaded 7 times
freevad_2.png
freevad_2.png (62.49 KiB) Viewed 644 times
freevad_1.png
freevad_1.png (63.21 KiB) Viewed 644 times
chrisb
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Posts: 53920
Joined: Tue Mar 17, 2015 9:14 am

Re: Strange jumping object - a bug or a user error?

Post by chrisb »

Hi and welcome to the forum!

It's a coplanar issue. Do a full recompute and you will see that already the first sphere will not be fusioned correctly. It works if the sphere is slightly moved.

I don't recommend at all to mix Part and PartDesign for this model. You can do it all in PartDesign. With proper attachments it may even work without the tricky move.
Attachments
Jimmi_Holder_cb.FCStd
(110.88 KiB) Downloaded 5 times
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HeineMau
Posts: 2
Joined: Wed May 31, 2023 7:24 pm

Re: Strange jumping object - a bug or a user error?

Post by HeineMau »

Hi Chrisb,
Thanks for your help :)

I was not aware of the "do not mix Part and Partdesign" recommendation, I'll stick to that in the future.

Your suggestion to simple move it 0.01mm seems to work here, but recompute does not work for me (ctrl+A & "Recompute object") - is there a better way?

The file You provided looks fine, but give me some "No extension found of type 'PartGui::ViewProviderGridExtension" messages

Thank You very much :)
chrisb
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Re: Strange jumping object - a bug or a user error?

Post by chrisb »

HeineMau wrote: Thu Jun 01, 2023 5:54 am Your suggestion to simple move it 0.01mm seems to work here, but recompute does not work for me (ctrl+A & "Recompute object") - is there a better way?
Select "Mark to recompute" on the root of your model. That marks all items with a blue hook. Then recompute.
The file You provided looks fine, but give me some "No extension found of type 'PartGui::ViewProviderGridExtension" messages
I use 0.21.
A Sketcher Lecture with in-depth information is available in English, auf Deutsch, en français, en español.
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Shalmeneser
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Location: Fr

Re: Strange jumping object - a bug or a user error?

Post by Shalmeneser »

:idea:
(PartDesign_AdditiveSphere is a pain. I cannot mirror it with the other features and need to do it after the 1st mirror.)
Attachments
Jimmi_Holder_SHALM.FCStd
(147.12 KiB) Downloaded 8 times
Capture d’écran 2023-06-01 194755.jpg
Capture d’écran 2023-06-01 194755.jpg (81.68 KiB) Viewed 450 times
chrisb
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Re: Strange jumping object - a bug or a user error?

Post by chrisb »

Shalmeneser wrote: Thu Jun 01, 2023 5:52 pm (PartDesign_AdditiveSphere is a pain. I cannot mirror it with the other features and need to do it after the 1st mirror.)
PartDesign primitives are known to behave strange with patterns. I think that @adrianinsaval just had an idea where it comes from, but it may not be easy to fix.

Here I would rather use a revolve anyway.
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