Parametric Involute Bevel and Spur Gears

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This OpenSCAD script provides modules for both Spur and Bevel Gears. It has some major enhancements over my original gear script http://www.thingiverse.com/thing:3534. It uses some of the spur gear nomenclature code from TheOtherRob http://github.com/TheOtherRob/MCAD with my own code for generating the involute teeth. The bevel gear is also my own work. Thanks also to elmom for some enhancements to my original gear script http://www.thingiverse.com/thing:3547.

Enhancements include the Bevel gear module, backlash settings, parameterised number of facets for the involute curve and whole of tooth generation to avoid some of the issues the original script had when mirroring a half tooth.

The STLs provided are not intended for direct use, but instead show examples of what can be done with the parametric script.

Parametric Involute Spur Gears take the following parameters:
number_of_teeth
circular_pitch or diametral_pitch: controls the size of the teeth (and hence the size of the gear).
pressure_angle: controls the shape of the teeth.
clearance: The gap between the root between teeth and the teeth point on a meshing gear.
gear_thickness: the thickness of the gear plate.
rim_thickness: the thickness of the gear at the rim (including the teeth).
rim_width: radial distance from the root of the teeth to the inside of the rim.
hub_thickness: the thickness of the section around the…