Needed two very small differential drive trains for a 1:50 R/C vehicle. Since the Lego variant is way to big, I was looking for something smaller.
Inspired (and convinced) by the amazing working version of MrCrankyface and others, I designed an even smaller version.
I was surprised by the outcome, see movie. Using only module 0.5 for all the bevel gears, without any ball bearings, it runs way better then expected!
It's Lego compatible, so no need to print shafts and wheels (at the moment).
Bill of materials:
- 7 printed parts
- 3x lego shafts
- 2x M2x12 bolt + nut
- 1x steel rod (D3x12)
After printing, 'clean' the gear teeth with a small flat screwdriver, including the cross-holes of the gears.
Also used a D3 bore, for making sure the 2 idler gears will nicely rotate around the steel shaft.
You have to press the Lego axis quite hard into the gears.