a gearmodule for freecad
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* install:
  * git clone https://github.com/looooo/FCGear.git
  * link or copy the FCgear/gear into /freecad/Mod (sudo ln -s (path_to_FCGear)/gear (path_to_freecad)/Mod


* create a gear:
  * open freecad
  * go to the gear workbench
  * create new document
  * create a gear (click on gear symbol)
  * change parameters