that spur definetly wont fit on 90mm wheels. it is designed for 97mm or 107mm wheels. i will not be releasing those files unfortunately, it’s a product I plan on putting into production
it’s relatively simple to make if you know all the weird quirks and details of inventor
Very interesting, I like the look of that for sure! What is the ratio on that? That is all pretty good info. I will be using dual sk3 5055 280kv motors, so it shouldn’t need to handle as much torque as a single 63mm motor. Which is why I think it could be plausible on my setup. I agree steel would be better, but nylon seems like it could be a cool proof of concept!
Ah, fair enough. Good luck on that! I have already made a pretty basic spur gear setup, just haven’t adapted it to my setup yet.
Haha I did, just not enough apparently 
I will look into that for sure
The pinion is hardened steel and will eat drill bits. On my 8mm motor shaft I machined it to 5mm and it works well… on a 9t 72t setup keeping the can diameter size on the motor to 40mm is the trick. Been running 1250kv 4200w goolrc 5mm shaft. Will make 35mph on 8s with great torque at all speeds. At $40.00 it gets the job done…g
How does POM compare to nylon or polycarb? Both are incredibly strong and great for gears, not to mention much more tested and widely used
I belive it’s here somewhere https://www.youtube.com/watch?v=scUEEQyC0GI Ok my mistake here… POM is available https://hobbyking.com/en_us/pom-3d-printer-filament-white.html?___store=en_us but I was thinking about polycarbonate and it’s in the video. https://www.youtube.com/watch?v=n0GdrC21qWw
I think unless you got a real pro 3d printer POM isn’t worth the effort. On other sites i’ve read recommendations of a 100++°C Bed and ridiculous warping properties even with enclosure, glue and all the stuff. Maybe try Polymaker PC Max if you don’t want to go for anything Nylon based.
I’ve had pretty great success with nylon, I was just interested in PC because of the stiffness and impact resistance. Honestly nylon seems to be a better choice for gears in most instances because I can’t shatter, and it’s self lubricating. Maybe a PC-Nylon alloy of some sort, although I think that’s what alloy 910 is
What’s bugs me most about the gears drive we see here is that apparently no one did the math to calculate the gear pitch and width, I bet we can make much more compact (narrower) drive train with all metal gears and maybe metal/polymer . I don’t know if there is bibliography for nylon gears readily available
But for steel is basically following a cake recipe for a first prototype, if one day I manage to buy a mountain board I will do that and see what comes out
I highly recommend you try to make a case that fully seals the gears before doing anything. i’ve got a mount and 2 spurs in my hands, but that’s the easiest part 