Multiplier / reductor gearbox

A rather simple gearbox multiplier/reductor (depending on the input). It either increases or decreases the rev/min by a factor of 4.

The gears are labeled by the number of teeth and shaft diameter. The teeth module is 1.25 , their thickness is 5mm and the distance between the shafts is 32mm.

I used the 6mm shaft/bearings because that was what I had lying around. I will make a 4mm version as well.

You will need:

2 x 6mm bearings
4 x 4mm bearings
2 x M4 screws for use as shafts
1 x M6 screw as a shaft
8 x M4 screw for the housing
and lot of nuts (lol)

Note :
- not tested to the limit, just with a 130 size motor


UPDATE 24.05.2022.

- Changed the diameter for the bearings so the plastic shouldn't crack when tightened
- Added some technical documentation