Heavy Duty Planet Gear

thingiverse

I designed a reduction box with an 8mm output shaft, tailored specifically for my application - I'm using two of these on my belt-driven Z axis. The drawing files are included, and feel free to modify them as needed. Note that some bearing holes have been adjusted in the files to suit my printer and filament. These parts were printed in PLA, but I've also produced and tested two of these for about six months now using ABS. Everything was printed from my computer using Simplify3D with a 3mm nozzle, 0.15 layer height, 20% infill, and five outer shells in all directions. The sun gear has 15 teeth, planet gears have 25 teeth, and the ring gear has 60 teeth - if I've calculated it correctly, this gives me a 5:1 ratio. My printer settings are as follows: * Printer: My Own * Rafts: No * Supports: Yes * Infill: 20% After printing, all I did was perform some light cleanup and lubricate the components with a good grease. Here's what I printed: * Cover * Three planet gears * One planet retainer * One ring gear * One sun gear And here are the hardware components I used: * Bearings: Four 608zz bearings (three for planet gears, one for output shaft), three 624zz bearings (for three planet gears), and one 105zz bearing (for sun gear) * Nuts and bolts: Three M4 cap screws with nylex nuts (cut to 44mm) for the planet gear retainer, four M3 grub screws (three millimeters long minimum) for the sun gear and drive shaft, eight M3 cap screws with nylex nuts for joining the body, four M3 cap screws for connecting the ring gear to the NEMA mount, and four M3 cap screws with nylex nuts for attaching the cover to the machine mount (length will vary depending on your setup) * Shaft: An 8mm drive shaft turned down to 5mm at one end to fit into the 105zz bearing