3d part design with Inkscape and Openscad #40: Making a Hirth joint

An easy way to design a Hirth Joint

2 min read
By Bob
3d part design with Inkscape and Openscad #40: Making a Hirth joint

Here is an easy way to make a Hirth joint with Inkscape and the perforate module I made for Openscad.

First I made a square in Inkscape and stretched it out so it was a diamond shape:

Then I imported it into openscad and used the perforate module to arrange the pattern:

Next I used the circle module to make a cylinder the size I needed for the outside and a cylinder for the hole in the center, and used difference to subtract the pattern from the circle:

It's also pretty easy to change the profile:

Here is an experimental bolt or screw head with a hirth joint as the driver: