Gear - KeithSloan/GDML GitHub Wiki
Sample Gear
Gears can be inserted into a document by using the external FCGear Workbench FCGear.
The Workbench can be installed, as usual, using the FreeCAD Addon Manager.
An example screenshot showing an involute gear
as it appears in the FreeCAD document (left) and
as displayed in the load_gdml_color application (right) is shown below.

The FreeCAD file can be downloaded from here Gear