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This is DEPRECATED in favor of
https://www.printables.com/model/430589-openscad-hirth-joints/comments/745049

Just published for others to see what's not working so well.
Unfortunately I can't remember the exact details regarding the problems with this oldest attempt.

This is a trapezoidal Hirt-Joint generator.

usage:
\u2013 either use customizer (thingiverse)
\u2013 or use it as a library like such:
hirth(
period_number,
flank_angle,
base_hight,
vertex_radius,
[cutround_diameter|default=0...do_not_cut_round],
[bore_radius|default=0...no_bore],
[vertical_stretching_factor|default=1],
[colormarked_vertices|default=false]);

Note: vertical scaling changes the flank angles.

Finishing & publishing motivated by:
http://www.thingiverse.com/thing:370976
\u201cHirth Joint (Angle Adjustment Discs)\u201d
Note that the design there is not really a Hirth joint. Enforcing Constant depth across radius leads to these weirdly twisting non-planar surfaces that diverge to impossibly narrow vertical lamellas at zero radius.

Other versions

Use this one, it's the newest one.
https://www.printables.com/model/430589-openscad-hirth-joints/comments/745049

There's another by now also DEPRECATED followup that uses boolean operations:
A supposedly improved version relative to this one.
\"Customizable Hith Joint (CSG version) (library)\"**
\u2013 https://www.printables.com/model/430631-customizable-hirth-joint-csg-version-library-depre
\u2013 migrated from here http://www.thingiverse.com/thing:397553

Category: Parts

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Customizable Hirth Joint (vertex version) (library) DEPRECATED

In collections (2 public and 4 private)

Birdie Shot

Joint