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?
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!
apyles wrote:Hi Slawek,
I like the Angle grinder gear box idea. What model of Dewalt grinder did you use for this?
bobc wrote:Oh dear.
I just acquired a broken 9" JCB grinder for its box.
And I've got 3 big outrunners on a single shaft to stuff into it -
Target is 0 - 60mph in 8 seconds.......
The design is very neat. I guess it would be even possible to fasten the motor at the swing arm to get it closer to the rear axle and save frame space for lipos
The grinders have output speeds between 4500 and 6000rpm, or about 15.000 to 20.000 rpm at the input. At 2KW thats only about 1Nm. The motor you use shoudl do about 5Nm, if you use a 6374 outrunner like I want to.
What's the outer diameter of you larger bevel gear? I can get 75mm ones for less than 5€ online, thats why I ask. At my local supplier an equal gear set with induction hardened teeth costs 12times as much
by nicobie » Wed May 09, 2012 3:03 pm
You do nice work! Lots of clever ideas here.
Watch out for the cops in NYC. I hear that they take your bike if caught riding it in the city.
I see you use the orginal gearbox of the grinder. I would like to build a new more compact one. Sadly, one should not turn the gear set the "wrong" direction cause it won't last long then either.
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