Planetary Gearbox 4:1 reduction

I designed and built this planetary gearbox for my robot arm project. After exploring several gearbox designs, I selected one that best matched my requirements. Each gearbox provides a 4:1 reduction ratio. In the configuration shown, two gearboxes are stacked to achieve an 8:1 reduction. The design is modular, allowing multiple gearboxes to be combined to reach higher gear reductions depending on the application. If you want to see more about how to mount the gearbox and what to do to make it more efficient, you can watch my youtube video here: https://www.youtube.com/@yonatanlab