Hey Jogi – do you have any plans or diagrams you use to build it? I would love to try to copy your design and make one. I have a basic machine shop (non CNC) in my garage, and I’ve been really interested in getting into geared unicycle design. Harper sent me some of his hub drawings, and I hope to eventually try to make one of his hubs too.
I understand now, to make it faster the inside ring must be fixed, this then boosts the orbitting ‘planets’ to turn the outter ring.
Juggleaddict, if it was the way you say it would make it easier to pedal i.e one rotation pedalling would turn rotate the wheel 0.75 or 0.5 times. I suppose it would be possible to gear and machine it in such a way that one can switch it around to do both.
I might look into and see what the possibilites are and the logistics, but I would never be able to make one.
Epicyclic gearing is used here to increase output speed. The planet gear carrier (green) is driven by an input torque. The sun gear (yellow) provides the output torque, while the ring gear (red) is fixed. Note the red marks both before and after the input drive is rotated 45° clockwise.
Perhaps you are both correct then, if either of them are fixed it will increase the output speed. If the outter ring is the ring fixed to the wheel it will also create more speed so long as the inner ring is fixed!
there would be some metal fab and welding of the frame, but no real machining. there is an example of one on youtube and a sick version Seen on this forum that’s red with carbon cranks and a disk brake… but you can pick up the unicycle profile crank and spindle, use the profile DH front mountain bike hub, a cog that fits the hub like a 6 bolt rotor and use a profile trials sprocket…
Yes, Wired, I’m pretty sure you’re right, either way will work. . . now that I’ve thoroughly read every word of the wiki article n.n’
I’m now need chocolate . . .
so, basically if you want to gear down, you would either
a.) if the outter gear is fixed, the sun would be the input and the planetary gears are the output.
b.) if the sun is fixed, the outter ring would be the input and the planetary gears are the output.
maybe I should make a Autocad file that has all of the scenarios of fixed vs free, and just post the file. I’m surprised at how confusing some of these articles can be when trying to explain this. I think it’s just one of those things that’s much easier to understand if you saw it work for 2 seconds.