FreeCAD / FreeCAD/FreeCAD

PartDesign: Additive Helix with negative Cone Angle breaks with height over one revolution

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#18,108 23 comments 0 reactions 0 assignees View on GitHub
3rd party: OCC Mod: Part Design Status: Confirmed Topic: Helix Type: Bug Type: Regression
Dominant language
C++
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Description

### Is there an existing issue for this?

- [X] I have searched the existing issues

### Problem description

I am trying to edit this model in FC 1.0: https://www.printables.com/model/826091

Here is what the file looks like in 0.21.2:
![image](https://github.com/user-attachments/assets/c947f974-9b63-4dee-b6ae-f1cfc86add12)

When opening the file in 1.0 the threads are reversed, they go down and expand outward. Also the settings of the helix:
![image](https://github.com/user-attachments/assets/a60f5635-8cdd-46b4-8981-63e8c82c50d0)

Playing around with the settings, the helix is correct up to (not including) a height of 6.0mm, which is exactly one revolution:
![image](https://github.com/user-attachments/assets/a50fc853-e2bd-4902-b32d-0d282eac90f9)

### Full version info

```shell
OS: KDE Flatpak runtime (GNOME/gnome/xcb)
Architecture: x86_64
Version: 1.0.0.39109 (Git) Flatpak
Build type: Release
Branch: (HEAD detached at 2fcc531)
Hash: 2fcc5317fe3aee96ca73475986a577719fc78e20
Python 3.11.10, Qt 6.7.3, Coin 4.0.3, Vtk 9.2.6, OCC 7.8.1
Locale: English/United States (en_US)
Stylesheet/Theme/QtStyle: FreeCAD Dark.qss/FreeCAD Dark/
Installed mods:
* fasteners 0.5.31

Also tried this on Windows, same result
```

### Subproject(s) affected?

None

### Anything else?

_No response_

### Code of Conduct

- [X] I agree to follow this project's Code of Conduct

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Assessment

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