Powered bogie for 2-axle railway models (HO/OO/On30/0e scale)

thingiverse

A powered chassis for a DIY locomotive. It is designed for a 2-axle locomotive without bogies, e.g. shunter, railbus, railcar, tram or similar vehicle. The motor used is a 10mm square motor, rated 14700RPM @ 9V, which is relatively low-rpm by micromotor standards. The resulting model can crawl rather well, provided the current pickup is good good enough or stay-alive capacitor is installed. To reduce noise, a rubber O-ring is used to transfer torque from motor to driveshaft (I tried plastic gears, too noisy. But I may use them in future versions), with around 2:1 reduction. Second stage of transmission is a worm gear with 11:1 reduction. The STL and STEP files provided have wheelbase of 81mm. For other designs Fusion 360 file is provided, so you can change the model according to your needs. The design can be parametrized by 2 values: wheelbase and motor position along the driveshaft (it can be moved back and forth). ## 3D-printed parts * Motor pulley * Driveshaft pulley * Chassis middle * Chassis upper * Wheelset cover x2 * (optional) Belt cover All needs to be printed with highest possible resolution, I used 0.08mm layer height, 0.4mm nozzle on Creality Ender 3. ## Parts to buy: List of parts to buy, with sample products from aliexpress. * DC motor, 10mm size: https://www.aliexpress.com/item/32825984761.html * Driveshaft: 2mm diameter brass axle: https://www.aliexpress.com/item/1005003000715062.html * Motor to driveshaft belt: O-ring 13mm OD, 1mm CS: https://www.aliexpress.com/item/4001148792117.html (this is a green FKM one, other types, e.g NBR, should also work) * 3 or 4 bearings 2X5X1.5: https://www.aliexpress.com/item/33007670757.html * 2x worm gear: 6x8mm 0.5mm module, 2mm bore https://www.aliexpress.com/item/32863434323.html * 2x wheelset gear: 0.5mm module, 11T teeth, 2mm bore https://www.aliexpress.com/item/32964343633.html * 2x wheelset (isolated for DC rails): https://aliexpress.com/item/32796356695.html * current pickups: phosphor bronze wire, 0.4mm diameter: https://www.aliexpress.com/item/1005004251949800.html * some perfboard to solder the wire to, or anything else that can can be glued and soldered * some thin wires * 6x 1.4x4mm self-tapping round head screws: https://aliexpress.com/item/1005004129037750.html * 2x 1.6x6mm self-tapping countersunk screws (to make top surface flatter, otherwise round-head screws will do): https://aliexpress.com/item/1005005747913017.html