Cycloidal Reduction Transmission, 144:1

thingiverse

I sat down and sketched out my design from scratch, drawing inspiration from pictures but never copying anyone's exact drawings.\r\n\r\nThe "drive_gear" and "interface_gear" need to be printed twice, as they will be reused in the final product.\r\n\r\nSince this design is relatively simple, it won't print without supports. The only part that might require support is the MainHousingOpen component; I successfully printed it with minimal stringing by omitting supports entirely. Even the shaft features a key that's specifically designed for unsupported printing\r\n\r\nThis transmission boasts a 144 to 1 gear reduction ratio, making it an ideal base for building a robot arm joint in the future. It's both compact and robust, requiring only mounts for the housing and determining how to power the input and output gears.\r\n\r\nI added some threads and a handle as placeholders; this design makes for a fun toy until further modifications can be made. You could easily convert it into a 12 to 1 reduction ratio transmission or add another layer of gear and drive to achieve a 1728 to 1 reduction ratio.\r\n\r\nA significant amount of post-print cleanup is necessary, as well as sanding the shaft and bearing surfaces until everything moves smoothly and freely.