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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