This part can be used as a more compact and convenient to mount option for drill gearboxes in DIY projects. It is designed around the generic 1:36 gearbox found in many cheap drills of various brands (for example Bosch PSR 960).
I´d recommend using the drill pattern as a template for making aluminium mounts for the motors due the heat created by the motors and shock loads in some applications.

Assembly:
You might have to grind off a little bit of the output shaft in order to fit the bearings onto them.
It is crucial that the ringgear interlocks with the holes in the 3d-printed housing. It will press further into those holes while tightening the screws.
The assembled gearbox should run smooth. If it doesn´t, check for misallignment, debris or such things.

Additional parts required:
-Donor drill
-12x19x5 ball bearing (2x)
-countersunk screw m5x50 and nuts (4x)

The shim pictured above is taken from the donor drill. The wheel pictured above is astandard foam wheel for 1/8th scale rc race cars and is pretty easy to mount on the 12mm part of the shaft.
So far I´ve done ~5min of test driving with these gearboxes on my half of a fw clusterbot (combat robot). Instead of the brushed 540 motors that came with the drills, I´m using an experimental brushless setup with 2212 outrunners. Here you can see a test drive: https://www.youtube.com/watch?v=h0skL8iD67g

Yes

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