An Electric Bicycle

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An Electric Bicycle

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vtsteam:
Keystock is usually soft -- comes in a 12" long stick at most hardware stores here, and you cut it to length with a hacksaw and file the ends smooth and chamfer corners. Usually you'd rather damage the key than the shaft if it shears.

You can always replace a key. Not so a shaft.

S. Heslop:
Ah. I was imagining you'd want it hard so that it's easier to get the gear off, but I guess protecting the spindle makes more sense. At least it won't be too hard to remake the shaft if it does shear.

S. Heslop:
Ain't it typical for a dropped item to bounce right into the darkest and most cluttered corner of any workshop. Luckily it was just the keyway, but I guess i'll order some keystock for making a new one.

I got one of the arms mostly assembled now, and it's a real goofy looking thing, but i'm glad things aren't too misaligned that it doesn't fit together. I'm still not too certain if it's even going to work over all though. The contact wheel will be about 50mm diameter maximum, and that's not going to have alot of surface to contact the smooth metal of the wheel's rim. I don't want to have to put too strong a spring on because i'm not so sure how well these bearings will handle the radial force. I guess time will tell though!

I'm waiting on some circlips to be delivered to finish off the gearbox part.

I also had another of those brain farts and cut the plates wrong, so the gear sticks out a bit forward of the front about a millimeter. Any cover i'd make would have to have a recess in it to accommodate that.

vtsteam:
Hey, it's looking just like your drawing. Good work! :thumbup: :clap:

PekkaNF:
looking good

You got that keyway right and if that gear is running concentric with a shaft you did really very good job. Keys are those things that look really simple but are easy to use wrongly. I'm resorting more and more on glue and shrink fit :lol:

Pekka

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