CVT Transmission: simple, customizable, with reverse!

thingiverse

This is a simple, continuously-variable transmission designed for printing. The goal is to produce a functional transmission suitable for mechanical drive systems. The concept relies on sliding a friction wheel along a shaft, changing the contact point circumference and thus altering gear ratios. Similar transmissions are found in lawn mowers and snow blowers. WORK IN PROGRESS! This project is still in its infancy, so expect subpar results for now. How I Created This I referenced a repair video demonstrating the mechanism's functionality. The relevant section starts at 2:08 minutes into the video: https://youtu.be/c4DvnxF7tv8?t=128 Known Issues Remain Unresolved 1. No clearance gaps exist between mating parts. 2. Arrangements must be made for printability considerations. 3. Circumradius and inradius math may not be accurately accounted for with faceted shafts. 4. Setting the number of sides to 0 should produce a round shaft. 5. The drive wheel needs to be split into an inner core and a molded silicone tire or o-ring. 6. Several other factors are likely being overlooked at this point.