Motorized Marble Machine with Lego Motor

thingiverse

I did not have a motor for this model so I re-designed it to use a Lego motor instead. I used an XL motor as it has the lowest RPM. The gearing reduces the XL motor down to 22.5 RPM. An M or L motor will run a bit faster (~42-48 RPM) so will require further reduction. The first working version (Version 2) I designed used studded Technic Lego but I redesigned the whole base to use more modern stud-less pieces instead with connector pegs and M3 beams connecting the M15 Beams to the base. I also re-modelled all the pieces of the model , enlarging all the holes to use Lego axles as the bearings. The drive gear uses a cross axle and I increased the cross dimensions by 5% as my printers dimensional tolerances are not accurate enough and even 5% larger the axle hole required a little filing. Video: <a href="https://youtu.be/R2jSBHPYcQo" target="_blank">Video on YouTube</a> Lego Parts: M3 Beam X 4 M15 Beam X 2 3M Cross Axle with end stop X 1 4M Cross Axle with end stop X 1 8M Cross Axle With end stop X 1 5M Cross Axle X 1 Half Bush X 1 Bush X 3 12 Tooth Double Bevel Gear X 2 36 Tooth Double Bevel Gear x 2 XL Motor Battery Box 16 Connector Pegs