Compound Planetary Gear Box (38:1 and 50.4:1) NEMA 17
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A fully 3D printed gear box that fits on NEMA motors and comes with two available gear ratios
- Ocena
- 4,75 / 5
- Polubienia
- 73
- Pobrania
- 425
- Wydruki
- 4
- Wyświetlenia
- 3522
- Oceny
- 4
Aktualizacja u źródła:
Informacje o modelu
- Źródło
- Printables
- Kategoria
- Mechanical Parts
- Licencja
- Creative Commons — Attribution — Share Alike
I've already used this gearbox to build a 5-axis robotic arm which will eventually also be available here. These gearboxes provide a lot of torque and are surprisingly durable with minimal backlash. They are not backdrivable. The photos are all of the demo version with the crank and acrylic window.
Remixed to fix broken geometry and improve tolerances to remove backlash. Included is also a demo version with a hand crank and a hole in the end cap to display the inside of the gearbox when it is assembled. The hole in the demo end cap is 55.5mm diameter and can fit an acrylic cover but it isn't necessary for it to function.
There are two folders that contain different sun gears, download the folder that contains the gear ratio you want.
Printing Instruction
I recommend printing the gears and rings with PETG, the End Cap and Motor Mount is fine in PLA. Each file is only printed once unless otherwise specified and some files are optional or alternates and are labeled as such. All parts are already oriented for printing (Yes, even the crank).
Print Settings
- 0.2mm layer height (Finer is okay but not necessary)
- No supports on all parts except for the Motor Mount which requires supports for the cutout on the bottom of the part, use a support enforcer for this
- Five walls for the gears and rings, normal settings are fine for the end cap and motor mount
- At least 10% infill
Assembly Instructions
No hardware required except for the four countersunk m3 bolts required to mount a NEMA motor to the gearbox. Assembly of the gear box is identical to the original so please consult the assembly video from the original creator:
TLDW, place the gears inside the rings and then the rings inside the motor mount. Correctly assembled the arrows on the planetary gears should point in the following pattern, otherwise it will bind up and the rings will not close completely:
If you are unsure about the assembly, please consult the video, it is extremely thorough. If after consulting the video you are still unable to get the rings of the gearbox to fully close with the planets installed, you may need to reprint the gears and rings with some negative horizontal expansion.