Electric Longboard Motor Mount

thingiverse

Make sure when you print the bottom half of the motor mount that you mirror it for one side of your truck. Ignore the two black wires on the bottom of the threaded rods; they were just used to hang it on a wall while I worked on it. 6/1/15 I posted the final models and mounted a motor. This motor mount requires zero metal working, which makes it appear to be the first one ever designed! I have no problems with this design so I won't change it past this model. The 52-tooth belt also appears perfectly fine. 3/14/16 The lock nut on the rod near the pulley was a bit too close for my liking, so I made a cutout to ensure it sits flush; model 4.6 is the result. Your belt thickness and truck length will determine whether you can use this design or not. I'm using a 9mm belt thickness that's very close to touching the mount. Be aware of your center distance, as I initially modeled one that was incorrect. A great calculator for this is https://sdp-si.com/eStore/CenterDistanceDesigner. I'm currently using a 149-kv motor with a 14-tooth pulley to a 28-tooth pulley, which I posted the models to, though it wasn't the configuration I wanted. I prefer to use a 15- to 32-tooth pulley. I was stupid and bought a 52-tooth belt that's far too short, so I had to shorten the center distance to make it barely fit. This design is intended to have nuts between the motor and the mount to allow for belt tension, but a 52-tooth belt is likely too short for that. I haven't tested it yet. In order to use that feature, I would need a 90-100 mm center distance. With a 52-tooth belt, a 14-tooth small pulley, and a 28-tooth big pulley, I barely manage 76. I recommend buying a 60-70 tooth belt (I eventually did) and using the 15-tooth and 32-tooth gear. I've also posted models for pieces that fill the inside of the wheel, ensuring perfect fit within my boards' wheels. These are separate from the pulley so you can easily change out the side of the pulley without having to reprint the entire model. I'll post pictures once I drill out my wheel, which will be on Monday. The mount is extremely strong with very little flex to it. I doubt I'll have any issues with slack in the belt. Eventually, I might try printing it in nylon, but it's extremely tedious and I would rather avoid doing it for everything but the most necessary parts. Not everyone can print in nylon, so I'd like to avoid that for their sake. 4/11/16 Long board motor mounting system using 7.6mm/.3in thick threaded rod with lock nuts and 3D printed parts. This is my solution for building a strong, no flex motor mount without having to custom machine metal parts.