Spur/Helical Gears Library for OpenSCAD

Big thanks to Leemon Baird for his work. Generate straight-toothed and helical involute gears, external or internal. There are no dependencies that this gears library relies upon, besides OpenSCAD itself. No support for worm gears, as that, in my opinion, follows a completely different paradigm. The API (Application Programming Interface) for this library resembles the following:

    use <invol-spur-gear.scad>;



    invol_spur_gear(n_teeth= 15,

                    width= 9.0,

                    mm_per_tooth= mm_per_tooth__gear_pitch_32(),

                    pressure_angle= 23.5);

The modules defined by this library are:

    invol_spur_gear()

    invol_helical_gear()

    invol_internal_spur_gear_plug()

    invol_internal_helical_gear_plug()

    invol_gear_rack()

In all of these cases this code library generates a single polyhedron which has no cuts or intersections. Therefore this code performs extremely well with respect to rendering and with respect to CSG operations, in OpenSCAD. Final shaping (such as bore hole) is the responsibility of the end-user. Gear dimensions etc. are available through a multitude of API functions written specifically for that purpose. Extensive sample code is included at the bottom of SCAD file; it's the code which was used to generate the animated GIF images. Thanks for stopping by. Please leave a comment and like.
REVISION HISTORY: version 1.01 (Jan 6, 2025): Initial version on Thingiverse (#6902903). version 1.02 (Jan 15, 2025): Parameter 'fillet_segs' takes the place of 'root_bevels', not backwards compatible; sorry about that. version 1.03 (Jan 18, 2025): Added optional parameter 'fillet_r_factor' for overriding radius of root fillets. version 1.04 (Jan 22, 2025): Dropped usage of pow() in favor of '^' operator; API comments on use of chamfers instead of fillets at tooth roots.