A Gear module for FreeCAD

Requirements

FreeCAD > v0.16
python > 3 (for python2 use branch py2)

Python packages

scipy, numpy, sympy (optional), jupyter (optional)

Supported gear-types

Cylindric Involute

• Shifting
• Helical
• Double Helical
• Undercut
• Fillets

Involute Rack

Cylindric Cycloid

• Helical
• Double Helical
• Fillets

Cycloid Rack

Spherical Involute Bevel-Gear

• Spiral

Crown-Gear

Worm-Gear

Timing-Gear

Lantern-Gear

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Installation

Addon Manager

Starting from v0.17 it's possible to use the built-in FreeCAD Addon Manager located in the Tools > Addon Manager dropdown menu.

pip

pip install https://github.com/looooo/FCGear/archive/master.tar.gz

Important note: Most systems have multiple versions of python installed. Make sure the pip you're using is used by FreeCAD as well.

Usage

Create a gear manually

• Open freecad
• Switch to the gear workbench
• Create new document
• Create a gear (click on a gear symbol in the toolbar)
• Change the gear parameters

Scripted gears

Use the power of python to automate your gear modeling:

import FreeCAD as App
import freecad.gears.commands
gear = freecad.gears.commands.CreateInvoluteGear.create()
gear.num_teeth = 20
gear.beta = 20
gear.height = 10
gear.double_helix = True
App.ActiveDocument.recompute()
Gui.SendMsgToActiveView("ViewFit")

Development:

if you have pixi installed just launch pixi and run this command pixi run freecad to launch freecad with freecad.gears installed.

References

• Elements of Metric Gear Technology (PDF)

FreeCAD Forum threads

These are forum threads where FreeCAD Gears has been discussed. If you want to give Feedback or report a bug please use the below threads. Please make sure that the report hasn't been reported already by browsing this repositories issue queue.

• "CONTINUED: involute gear generator preview !" (thread)
• "Bevel gear - module/script/tutorial" (thread)
• "Gears in FreeCAD: FC Gear" (thread)
• "FC Gears: Feedback thread" (thread)

License

GNU General Public License v3.0