Lego Duplo Train Final Spur Gear (27 teeth) Replacement
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Replacement final drive (spur gear) for old 1990s Lego Duplo Train. 100% accurate.
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Informacje o modelu
- Źródło
- Printables
- Kategoria
- Mechanical Parts
- Licencja
- GNU General Public License v3.0
The final spur gear from my old Lego Duplo train broke, so I reverse engineered a 100% accurate replacement.
Step file included - make sure to export with a very fine resolution as this is a tiny part.
To open up the train I recommend this great instructables writeup: https://www.instructables.com/Repair-of-a-Lego-Duplo-2933-and-a-Duplo-2962-Train/https://www.instructables.com/Repair-of-a-Lego-Duplo-2933-and-a-Duplo-2962-Train/
To print this effectively you have to use 0.2 (maybe 0.25) nozzle. PLA actually works fine due to better surface wear properties compared to PETG. However Nylon would be the perfect replacement.
Fit is extremely tight, I had to hammer the gear onto the shaft and I used well calibrated printer and slicing profile. Horizontal expansion settings are necessary!
Gear parameters:
- Z = 27 teeth (the meshing gear has 9 teeth)
- Alpha = 7 mm (distance between center points of the two axes of the meshing gears)
- Module (m) ~ 0.3889 mm
- Pitch Circle Diameter = 10.5 mm
- Pressure angle: 20°
- Addendum = 1.0 x m ~= 0.3889 mm
- Dedendum = 1.25 x m ~= 0.486 mm
- Root fillet radius ~= 0.12 mm
- Tip relief ~= 0.05 mm
- Backlash = 0 mm
Center bore / shaft diameter: 3.7 mm
Depth (thickness): 2.55 mm