usage: ggears [-h] [-n NUM] [-p PRESSUREANGLE] [-t TYPE] [-dia DIAMETER]
              [-a ADDENDUM] [-d DEDENDUM] [-m MODULE] [-r RESOLUTION]
              [-f PREFIX] [-tm TMAT] [-ft FILETYPE]

example: ggears -n 36 -p 20 -t internal -dia 44

optional arguments:
  -h, --help        show this help message and exit
  -n NUM            Number of teeth (Required)
  -p PRESSUREANGLE  pressure Angle (Required)
  -t TYPE           internal or external (Required)
  -dia DIAMETER     Diameter of hole for external gear or outer diameter of
                    internal gear (Required)
  -a ADDENDUM       Manual override of addendum (normally 1/Pitch Diameter)
  -d DEDENDUM       Manual override of dedendum (normally 1.25/Pitch Diameter)
  -m MODULE         Module
  -r RESOLUTION     Sets the number of points in the involution
  -f PREFIX         Choose file prefix (example: -f name)
  -tm TMAT          Transformation Matrix for Inkscape (default:
                    3.5434,0,0,3.5434,0,0 for mm scale)
  -ft FILETYPE      (svg or dxf) Use this option if you want to bypass
                    plotting or if Tkinter is not available

Created by Gareth Nisbet 2014