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Old 2008-01-10, 03:21 AM   #1
dangerdog
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home made geared uni

Hi I built a geared uni using gear cogs salvaged out of an old self drive lawnmower.It involved major alterations and fabrication resuling in a 26" wheel geared up to mimic a 37" wheel.Unfortunately it didn't work due to the massive torque forces twisted the frame until the gears lost mesh.Determined not to be defeated I refashioned the hub to run chain and sprocket type gearing and made an adjustable jackshaft to adjust the chains.This new setup also gives 37" gearing and is successful with a 10km ride completed.



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Old 2008-01-10, 03:27 AM   #2
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good work
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Old 2008-01-10, 03:28 AM   #3
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Video or it didn't happen
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Old 2008-01-10, 03:28 AM   #4
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thats awesome man!
i hope it hold up alright.

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Old 2008-01-10, 03:30 AM   #5
Hazmat
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That is 1 awesome looking unicycle you have there my friend. Good work too also.
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Old 2008-01-10, 04:13 AM   #6
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Stunning... simply stunning.
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Old 2008-01-10, 04:18 AM   #7
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Nice work!
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Old 2008-01-10, 04:33 AM   #8
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i made my own geared uni and posted a video of it here
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Old 2008-01-10, 05:07 AM   #9
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Old 2008-01-10, 05:29 AM   #10
john_childs
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That is too cool. Congratulations on making a successful geared uni.

I wonder if the second version would have ended up working if the frame was stiff enough?
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Old 2008-01-10, 05:57 AM   #11
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That is too cool.
Yes, VERY!
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Old 2008-01-10, 06:19 AM   #12
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holy crap, nice work!

looks like you're close to being able to run a derailleur for some gearing on the fly
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Old 2008-01-10, 04:04 PM   #13
harper
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Too bad the initial gearing didn't work out. I would still like to see a viable version of that implementation. The jack shaft design is a good one that has been thoroughly proven on Pete Perron's three versions (also homemade) of the idea. The simplest and cheapest of the homemade jack shaft driven unicycles has to be Tyler's but we haven't had much of an update on it since his major axle modification.

You have the sprockets separated by quite a distance. Is that to give you as much room as possible to fit them between the spokes and the frame up towards the rim? The long chains probably add a bit of weight as well as increase the amount of backlash due to the extra chain links. It may not be possible for you to locate the sprockets down where the spokes flare out to the hub flange, though. Cool implementation. Did you do all the work yourself? About how many hours?
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Old 2008-01-10, 04:30 PM   #14
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Guys that is awesome! Having been there, congrats on putting in the all the time and effort it takes to create a rolling work of metal art! Respect has been earned.
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Old 2008-01-10, 04:41 PM   #15
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Hey man thats cool do use a front derailler off a bike or something?
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