9:1 3D Printed Cycloidal Drive Gearbox for NEMA 17
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A cycloidal gearbox for the NEMA 17 stepper motor, 9:1 reduction ratio.
- Ocena
- 2,4 / 5
- Polubienia
- 19
- Pobrania
- 228
- Wydruki
- 2
- Wyświetlenia
- 1419
- Oceny
- 5
Aktualizacja u źródła:
Informacje o modelu
- Źródło
- Printables
- Kategoria
- RC & Robotics
- Licencja
- Creative Commons — Attribution — Noncommercial
Entirely 3d Printed Cycloidal Drive Gearbox.
Update:
Added a new version with very low tolerances and also holes in each of the outer pins for an M3 screw, allowing for reinforcement for better rigidity. Use the new version if you are confident in your printer's ability to produce tight tolerances. The new version has extremely low backlash (though the old version still had fairly low backlash for a 3d printed gearbox). Additionally, due to the reinforcement, I believe the new version will likely hold up better under high loads (>1.5N⋅m). If you don't need the maximum torque or lowest possible backlash, the old version should still work fine.
Requires 4 screws (2 M3 screws to hold gearbox onto motor, 2 screws (any small screw would work) to hold lid onto gearbox).
I printed with 2 walls + 15% cubic infill and it seems to be holding up fine, but I would recommend 3 walls for strength. Particularly consider printing the output shaft with more walls or a higher temperature, because failures during extreme testing failed on the pins In my testing I used PLA, though Nylon may be better for less wear and better strength. I would also recommend applying lubricant in between the eccentric inputs and gears, between the gears and pins, and between the gears and body. For tolerance modification or adding any features, the STEP files are also provided. It takes only 40-50 grams of filament to print, and should print in around 2-3 hours.
Assembly:
Place body on motor
Screw body into motor using M3 screws
Place one of the eccentric input shafts on the motor shaft (either one works)
Place one cycloidal disk onto eccentric input
Place the other eccentric input shaft onto the motor shaft
Place the 2nd cycloidal disk onto the eccentric input (may require a bit of rotation/wiggling)
Insert ouptut shaft pins into the holes on cycloidal disk (ensure the pins go through both disks, may require some wiggling/rotation). For this step sometimes I find it helpful to turn on the motor and insert the pins as the disks are rotating.
Insert the axial ring/shaft holder
Place the top on and screw on the top