Help on drawing a worm gear with its involute gear

[keithsloan52]

Given OpenSCAD is producing the polyhedron with a lot of vertex,
That OpenSCAD Hull and Minkowsky get translated as a Mesh.

Wondering if there is any mileage in having a facility to select such objects and convert to Nurbs, especially
as we now have a Surfaces Module. Maybe such a facility already exists

Would be interested in @microelly2 comments

[keithsloan52]

Mesh and Polyhderon to Surface
==========================

There seems to be software to do this but so far have not found any open source offerings.

Commercial programs that seem to have this function

• Rhino ( Mesh2Surface plugin )
• Grasshopper https://www.grasshopper3d.com/forum/top ... to-surface
• TrueGrid http://www.truegrid.com/geometry.html

@microelly2

[keithsloan52]

I had the same question, came across this thread and like to share a good solution i found on the way.

Here is a parametric globoid worm gear drive for OpenSCAD.
https://www.thingiverse.com/thing:2776688

It's nicely written. It explains the way to get geometry in the gif.
To import it in FreeCAD OpenSCAD Workbench paste the content of the 3 .scad files and adapt the parameters.

Pros: easy, fast, precise, good documented
Cons: won't be a native FreeCAD object.

Unfortunately, I can't import the OpenSCAD's .scad files into FreeCAD. I have explained the issue here in details.

my environment is:

OS: Windows 10
Word size of OS: 64-bit
Word size of FreeCAD: 64-bit
Version: 0.18.16131 (Git)
Build type: Release
Branch: releases/FreeCAD-0-18
Hash: 3129ae4296e40ed20e7b3d460b86e6969acbe1c3
Python version: 3.6.6
Qt version: 5.6.2
Coin version: 4.0.0a
OCC version: 7.3.0
Locale: English/UnitedStates (en_US)

You need to tell the FreeCAD OpenSCAD workbench where to find the OpenSCAD executable.

[keithsloan52]

I had the same question, came across this thread and like to share a good solution i found on the way.

Here is a parametric globoid worm gear drive for OpenSCAD.
https://www.thingiverse.com/thing:2776688

It's nicely written. It explains the way to get geometry in the gif.
To import it in FreeCAD OpenSCAD Workbench paste the content of the 3 .scad files and adapt the parameters.

Pros: easy, fast, precise, good documented
Cons: won't be a native FreeCAD object.

Unfortunately, I can't import the OpenSCAD's .scad files into FreeCAD. I have explained the issue here in details.

my environment is:

OS: Windows 10
Word size of OS: 64-bit
Word size of FreeCAD: 64-bit
Version: 0.18.16131 (Git)
Build type: Release
Branch: releases/FreeCAD-0-18
Hash: 3129ae4296e40ed20e7b3d460b86e6969acbe1c3
Python version: 3.6.6
Qt version: 5.6.2
Coin version: 4.0.0a
OCC version: 7.3.0
Locale: English/UnitedStates (en_US)

You need to tell the FreeCAD OpenSCAD workbench where to find the OpenSCAD executable in the OpenSCAD workbench preferences.

[Shalmeneser]

Please don't put all the posts in your quote, just what is absolutely usefull.

[papyblaise]

still an old mummy exumed from a time when Fc was V16 or V17
ask your question again on a new post, with more information

[keithsloan52]

Loaded globoidworm.scad with FreeCAD Daily, saved to DropBox

Code: Select all

OS: macOS 10.15
Word size of OS: 64-bit
Word size of FreeCAD: 64-bit
Version: 2021.922.24301 +4188 (Git)
Build type: Release
Branch: LinkDaily
Hash: 3de879c7a2ba7111cc769d98636eb6d43189459d
Python version: 3.9.7
Qt version: 5.12.9
Coin version: 4.0.1
OCC version: 7.5.2
Locale: C/Default (C)

https://www.dropbox.com/s/ue76kc8ezn226 ... FCStd?dl=0

[ir4i]

OpenScada from thingiverse - is a best variant. Unfortunately, while I found it, I managed to come up with my own.
https://photos.google.com/photo/AF1QipN ... g5z52Jw5pC
https://demonstrations.wolfram.com/Toro ... icalCoils/
build curve with macro mwganson/Parametric_Curve_FP
and sweep with pipe loft
https://photos.google.com/photo/AF1QipO ... umlRNZsGpG
but have some problem on this way - correct working only with Frenet orientation mode for tooth scetch
https://photos.google.com/photo/AF1QipM ... Ij6zCX-I8_
standard caused this
https://drive.google.com/file/d/1bOhwhQ ... nload_link
https://drive.google.com/file/d/1lfJ66p ... nload_link