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A Gear module for FreeCAD

Liberapay

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-gear

Involute Rack

involute-rack

Cylindric Cycloid

  • Helical
  • Double Helical
  • Fillets

cycloid-gear

Cycloid Rack

cycloid-rack

Spherical Involute Bevel-Gear

  • Spiral

bevel-gear

Crown-Gear

crown-gear

Worm-Gear

worm-gear

Timing-Gear

timing-gear

Lantern-Gear

lantern-gear

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