Houdini Gears

One of the most basic things I always wanted to do with Houdini, procedural gears, automatically animated based on radius of the gear. Finally took the time to sit down and do it.
Vimeo and Youtube link below, choose your poision:
https://vimeo.com/243448941
https://www.youtube.com/watch?v=-RvfTSrgBDM&feature=youtu.be