Thank you guys, I am glad you like my build, it's really mean a lot to me.
spinningmagnets wrote:This is a wonderful build! I can't think of anything to suggest. Very professional.
Using a bolt as the motor shaft is an idea that solves a problem I had. I don't like how small the tip of an 8mm diameter shaft is, and I have had success using the 63mm diameter motors with the 10mm shaft (with two flats ground onto the sides of the shaft tip, to key into a drive-shaft slot). For direct-drive on my friction set-up, I like the 63mm motors. But if I add a reduction, I think the 50mm motors (with an 8mm shaft) have some useful kV's. An 8mm-shank bolt has a head that can be ground into the size and shape I want.
If you make a cover for the motor and belt, perhaps make the sides from clear plastic so everyone can still see it?
To be honest I did not implement Ã˜10mm shaft in my motor, but Ã˜8mm like original one. I just used Ã˜10mm screw because I couldnâ€™t find Ã˜8mm long enough. Besides changing bearings to fit Ã˜10mm shaft, even using needle bearings, required to much interferences in motor (to close to magnetic stator). It was much easier mount screw on lathe machine an cut 2mm from diameter.
I will think about sides from clear plastic.
katou wrote:That, was riveting. And no, I'm not kidding. Your bike is not only clean and effective, and very, very stealth, but it uses a drivetrain that I've never seen successfully implemented!
Nice and quiet too!
1. the rear pulley is attached using the same holes that the disc is? You just ran longer bolts to go through both?
2. What the heck does the small pinion gear look like now? How did you make that part?
3. the new interface with the pinion gear, the bolt head. How did you attach that to the shaft of the motor?
TIA, and again, wow!
Lets say relatively quiet. I say that because I have seen many builds on ES and I am impressed how quiet hub motors are. Slowly I am thinking about second build with no gearbox, just pulley on motor, rear wheel and polychain belt, but before I start, I have a lot â€œhomeworkâ€ to do.
To answer your questions:
1. Yes. I just simply removed rivets, drill trough disc brake and 6 arms shimano central lock to fit screw #10. Big pulley has 6 threadâ€™s #10-24.
2 & 3. Maybe this picture bring a little light what I have done here.
From left: It is brand new pinion with metal ring. I just simply replace this ring with bearing. (I had to turn a little bit to bearing in diameter)
The bolt head go inside pinion.