I made a precision gearbox - with NO GEARS.

If you want to build your own Cyloidal drive, let https://www.pcbway.com take care of the machining.

This was one heck of a project, but I made it in the end. A (nearly) zero-backlash 4th axis for my home made milling machine.

We've got merch! https://notanengineer.shop

If you want to follow the projects a little closer, head over to https://www.patreon.com/NotAnEngineer.

@InheritanceMachining had to build a bigger box of shame because of me, go watch that NOW: https://youtu.be/uQQH8XzlgVU?si=NrNNeq5qd045CpV7

Bambu Lab Store: (affiliate)
https://shareasale.com/r.cfm?b=2282157&u=4236696&m=138211&urllink=&afftrack=


Sources:

@HowToMechatronics - What is Cycloidal Drive? Designing, 3D Printing and Testing https://www.youtube.com/watch?v=OsS9-FzKN6s

@LeviJanssen - Has a lot of great videos on cycloidal drives

@jamesbruton - also has a lot of great videos on cycloidal drives

the best look inside a real cycloidal drive I could find: @arduinoversusevil2025 (AvE) - BOLTR: SUMITOMO CYCLO GEARBOX | Zero Backlash! https://www.youtube.com/watch?v=dYVPU47c9WA&t=577s&pp=ygUPY3ljbG9pZGFsIGRyaXZl

Cycloidal Drive Parametric Equations - https://blogs.solidworks.com/teacher/wp-content/uploads/sites/3/Building-a-Cycloidal-Drive-with-SOLIDWORKS.pdf

Fusion Script I modified: https://capolight.wordpress.com/2018/07/02/how-to-sketch-equation-curves-in-fusion-360/

My modified version for drawing epitrochoids: https://pastebin.com/05iDZssp

@ROBRENZ's large bore laps: https://www.youtube.com/watch?v=AEsaSN4LLU4&t=1190s

Solid toolpost mount inspired by @StefanGotteswinter