[SteinHDan]

This is a great model from Bruder and of course I had to give it a try when my son asked me if we could make it RC.

Goals of this project:
1. Minimize work :-)
2. Have a fully functional model (but it doesn't need to be very strong)
3. Great sound


Taking the model apart:




Cut off the drive wheel axles. Expand the axle hole up to 6mm.




3D-print a hub that sits in the old wheel. A steel rigid flange coupling (6mm axle, M3 holes) is screwed to the hub with four M3x15mm self-tapping screws. The motors are 12V 62RPM worm gear motors.






Fixing the hub in the wheel by drilling two small holes, one from each side, into the wheel and hub and using two small self-tapping screws M2x7mm:




Cut away some plastic to make room for the motors:



Make sure they fit snuggly:






3D printed a template to guide where the motor mount holes should be (3mm):




Carve out the inside of the motor mounts to give room for the steel coupling. Drill a small hole from the underside to be able to reach the set screw in the coupling when it has been inserted into its position:




Attach the motors with two M3x6 bolts on each side:








3D print motor covers for the motors and attach with two self-tapping screws:












Re-add the tracks: