20:1 & 20:-1 Compound Planetary Scissor Gearbox

thingiverse

#### Featured In These YouTube Videos: - Demonstration and Backdriving https://youtu.be/tt3BZNSQMb0 #### Print Settings! - You MUST use supports to print some of these parts, it was really unavoidable. - If you wish to back-drive this, you'll need to use at least -.05 horizontal expansion setting ####This Looks Familiar! - This gearbox is scaled up (150%) from the size used in the robotic arm project, but it doesn't work the same way so its incompatible even if it was scaled back down. ####Assembly - Print the planets with a raft, they will print in the right alignment. leave the raft on until the gearbox is assembled. place the sun gear inside the planets, and put ring gear #2 on. Place a ring closure on ring #2 and then install all the other ring gears. #####How it works - When the sun gear is turned, Ring Gears #1 & #4 will be at the same potential and Ring Gears #2 and #3 will rotate opposite to each other. #### Other Important Info: #####CAD Files?? - I Included the Fusion 360 Project with this, But the most recent version of this project can be downloaded in lots of different formats from this link: http://a360.co/2kWXprN - Feel free to create your own modifications and parts for this project, and if you do, make sure you create a remix and upload them, then I'll add them to my main collection so the whole community can share them! Thanks! ####Gearing Information - Final Ratio 20:1 and 20:-1 - Planetary Gear Set A (Modules 1 and 4) - Teeth Sun: 18 - Teeth Planets: 12 - Teeth Ring: 42 - Planetary Gear Set B (Module 2) - Teeth Sun: 14 - Teeth Planets: 14 - Teeth Ring: 42 - Planetary Gear Set C (Module 3) - Teeth Sun: 22 - Teeth Planets: 10 - Teeth Ring: 42 #####Show Your Work! - Make a "make" and show everyone what you made! (make? :0) Everyone will thank you for it! ####For More Cool Projects and Upgrades, Don't forget to Follow Me on Thingiverse and Subscribe to my Youtube Channel <p> <a href="https://www.youtube.com/c/GearDownForWhat" title="Gear Down For What">Gear Down For What?</a> </p> #### Thanks! - Special Thanks to Ross Korsky for doing the design calculations on this one! Great work!