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Old 01-18-07, 06:17 PM   #1
wethepeople
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Universal Joint on a tallbike?

Is there any reason it couldnt be done?

I'm going to pick up a cheap U-joint and use it instead of lining up the forks because the head tubes are two different angles. I cant imagine why it wouldnt work, but then I'm not exactly the smartest person when it comes to these things.

Although I have already learned abit from building this.
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Old 01-18-07, 07:17 PM   #2
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Just keep in mind, that a universal joint doesn't transmit rotation linear. Meaning the angle you turn one end is not the angle you get at the other end, except when it is straight. The larger the angle between the two axels the larger the discrpency. And at a certain angle it locks up.

http://en.wikipedia.org/wiki/Universal_joint
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Old 01-18-07, 08:29 PM   #3
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Quote:
Originally Posted by Rincewind8
Just keep in mind, that a universal joint doesn't transmit rotation linear. Meaning the angle you turn one end is not the angle you get at the other end, except when it is straight. The larger the angle between the two axels the larger the discrpency. And at a certain angle it locks up.

http://en.wikipedia.org/wiki/Universal_joint
would a CV (constant velocity) joint prevent these problems? It sounds like an expensive option. but I have a couple axel shafts sitting in a Geo Metro I'm parting out.
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Old 01-18-07, 08:41 PM   #4
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Originally Posted by StokerPoker
would a CV (constant velocity) joint prevent these problems? It sounds like an expensive option. but I have a couple axel shafts sitting in a Geo Metro I'm parting out.
It would:
http://en.wikipedia.org/wiki/Constant-velocity_joint

But it's usually also a very heavy option. I would use the universal joint and keep the angle fairly low (<<45).
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Old 01-19-07, 09:07 AM   #5
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A fairly cheep and small(think bicycle) universal joint is to use a universal socket.They would need to be welded in place.
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Old 01-19-07, 11:40 AM   #6
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You might run into a problem if the unversal joint isn't machined to very precise tolerances. Universal joints are designed for constant rotation in one direction. If there's any "slop" between the pieces, it will be hard to keep the wheel perfectly straight, and steering will feel a bit wobbly.
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Old 01-19-07, 07:42 PM   #7
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Quote:
Originally Posted by wethepeople
Is there any reason it couldnt be done?

I'm going to pick up a cheap U-joint and use it instead of lining up the forks because the head tubes are two different angles. I cant imagine why it wouldnt work, but then I'm not exactly the smartest person when it comes to these things.

Although I have already learned abit from building this.

A friend of mine did exactly what you are thinking about. It works fine, I have ridden the bike.
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Old 01-19-07, 09:24 PM   #8
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Well, no reason for it anymore. I got it to work, and here is some pics of the progress even though you guys have all seen tallbikes .



And here is something else a friend made a while back, and yes, it does work.
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