This is a geometrically CORRECT Hirth joint. It includes SOURCE files and DOCUMENTATION.

There are a lot of Hirth joints out there. Some are completely wrong, some are very close, but almost none of them are geometrically correct. If you measure the angles between mating planes, you find they are not exactly parallel.

The flies section contains a download for the source files in both Fusion 360 and Solidworks. Several methods for creating Hirth joints are included. Read the documentation to learn the difference between them. However, if you don't care to trudge through the paperwork, the safe option is to use the following.

Fusion 360:
Hearth Assembly - Perpendicular - Subtractive.f3z

Solidworks:
Hirth Joint - Perpendicular - Subtractive.SLDPRT

Included STL for a Hirth joint that fits Manfrotto tripods (also called a Manfrotto Rosette).
Outer Diameter: 25 mm
Inner Diameter: 14 mm
Tooth Profile Angle: 60 degrees
Number of Teeth: 25

Included STL for a large Hirth joint which is useful for educational and demonstration purposes.

How I Designed This

Design Instructions

Fusion 360:
Hearth Assembly - Perpendicular - Subtractive.f3z

Solidworks:
Hirth Joint - Perpendicular - Subtractive.SLDPRT

Editing Design Files

To create a custom Hirth joint, edit the variables in the design files.

• For the Fusion 360 these are stored as "Parameters."
• For the Solidworks files these are stored as "Global Variables." Read the comments for information about what each of the variables does.