ASME B18.22.13 UNC Thread Issue

[basepr1me]

Hello,

Threads are not being properly cut for several sizes. I did not test all sizes, but 7/16 - 3/4 are having issues and I just randomly clicked on 2 3/4 which appears to not cut the threads properly either. So, it appears to be hit and miss.

[shaise]

please attach a sample file.

[basepr1me]

GitHubIssue.zip

[Syres916]

@shaise looks to be OCCT version to me, works fine using 7.6.3:

OS: Linux Mint 22.1 (X-Cinnamon/cinnamon)
Word size of FreeCAD: 64-bit
Version: 0.21.3.33910 (Git)
Build type: Release
Branch: 021_Python_3_12_And_Other_Fixes
Hash: cbb0eb848d5311cebb33311a01ec8910692ae5d6
Python 3.12.3, Qt 5.15.13, Coin 4.0.2, Vtk 9.1.0, OCC 7.6.3
Locale: English/United Kingdom (en_GB)
Installed mods: 
  * FreeCAD-Ribbon 1.8.1.2 (Disabled)
  * btl 0.9.9
  * FreeCAD-themes 2025.1.7 (Disabled)
  * Silk 0.2.0
  * sheetmetal 0.7.24
  * Behave-Dark-Colors 0.1.1
  * CfdOF 1.31.4
  * ChangeAppFont
  * Quetzal 1.5.6
  * fasteners 0.5.38
  * freecad.gears 1.3.0
  * Curves 0.6.64
  * QetWireManager
  * A2plus 0.4.68

[Syres916]

@basepr1me it's always best to quote your full FreeCAD info so we know exactly which version of the libraries you are using, I'm guessing you're using OCCT 7.8.1 but that's a guess.

[shaise]

Yes, its an OCCT issue.
On windows and occt 7.8.1 (FC 1.0 +) it does not work
On windows and occt 7.6.3 (FC 0.21) it works.