Planetary gearbox for 130 dc motor

thingiverse

This planetary gearbox is specifically designed to work seamlessly with a 130 size, 3v DC motor, boasting an impressive gear ratio of 1:15.5. To bring this design to life, print three copies of the gear9 as the planet gears. The five holes in the support are strategically positioned for tapping with 3mm screws. Four screws securely fasten the annulus part, while the central screw - measuring 30mm in length - serves as a vital axle for both the sun gear and the wheel. A critical design aspect is the central hole diameter of 3.2mm, which allows for a smooth, freely rotating 3mm screw. However, due to z-axis wobble issues with my printer, I must drill the holes clean using a 3mm bit. The three other holes on the wheel are designated for tapping with 10mm length 3mm screws, serving as axles for the planets. To complete this miniature sumo robot design, which is limited to a 10cm x 10cm footprint, I employed a rubber band cut from a bicycle inner tube as the tire. Although the gear ratio might be slightly low, I'm eager to put it to the test and see how it performs.