Introduction: Building a "Universe Cycle"

While searching on-line for a unicycle, I saw something similar to this. It looked like a fun project and a good addition to our collection of dangerous toys. The kid next door came up with the name. Others called it a unicycle with training wheels.

Step 1: Parts List

3/4" Plywood. A little more than 3 sq.ft.
2x6. About 24" long
1/2 NPT Steel Pipe. 2 pieces @ 8" long.
1/2 NPT Steel Pipe Flange qty 4
1/4-20 x 1" Flat head screws qty 16
1/4-20 Nuts (I used T-Nuts) qty 16

Cost To Build. I had everything except the plumbing parts which were about $18.
Duration: About 2 hours not including the decorating time.

Step 2: Pedal Assembly

Put one flange on each end of an 8" x 1/2 NPT steel pipe. Tighten as tight as you can.
Measure the width of the exposed pipe to determine the proper pedal width. Mine measured about 7.00"

I made each pedal out of two pieces because my drill was not long enough to go all the through and I was worried about keeping the hole straight through such a long length.

Rip the 2 x 6 to half the pedal width on a table saw. Subtract about 1/16" more for clearance.

Cut into (4) 4" long pieces.

Mark the center of each piece on the 4" x 1-1/2" face and drill through 7/8" Dia.

Glue the pedals together with the holes lined up.

Clamp and set aside to dry.

Update: OK...The squeekyness got a little old. A quick squirt of silcone lube inside of each pedal took away the squeek. It has not come back even after many days of play.

Step 3: Wheels

Cut (3) 12" diameter circles out of 3/4" plywood.

I used my homebuilt CNC router, so I added some extra details. A jigsaw or bandsaw would work just as well.

Place a flange on the wheels to to mark for drilling the attachment holes. The center of the flange is located 3.5" below the wheel center. The (2) outside wheels require (1) flange pattern and the center wheel needs it on both sides of the wheel.

Optional: Use a round over router bit around both outside edges of each wheel. This will make it look a little better and limit the chipping of the edge as it is used.

Step 4: Final Assembly

Assemble the pedals onto the pipe and attach the flanges. Tighten the flanges as tight as you can, but make sure the mounting holes are oriented correctly for the wheels.

I was worried about this coming loose so I added a few tack welds from the backs of the flanges. Epoxy would probably work as well.

Attach the pedal assemblies to the wheels using the screws and T-Nuts. You could probably use standard hex nuts or woods screws.

Step 5: Decorate

I finished mine with some cabernet stain and clear spar varnish.

I routed a diamond plate pattern into the pedals, rounded the edges and painted them black.

Step 6: Ride.

Be careful. Wear a helmet and wrist guards.

While it is quite intimidating to get on the first time, it is easier than it looks to ride. I am upper 40s and have never successfully ridden a unicycle (yet) and I was able to figure this out in about 10 minutes without a single crash to the ground.


Start along a handrail or ledge where you can steady yourself. Set the pedals with one high and one low (6 and 12 o'clock). Step on the low pedal first. Then step onto the high pedal, while keeping more weight on the low pedal to keep it from moving. Now slowly roll forward until the pedals are even (3 & 9 o'clock). Now try to pedal forward. Avoid stopping at the 6 & 12 position at first because you have the least control there. Try to keep a little pressure on the rising pedal. This will limit the speed and jerkiness.

If you feel like you are going to fall, step off with the high foot first. The lower foot will rotate the cycle a little, but it gets pretty stable. It does not turn sideways well, but you can usually get it to rotate on smooth ground.

The video is my daughter's first successful run across the garage. She is quite good at it now.

Comments

author
brupielink (author)2011-10-03

Ah, those things! Still have them around here for the kids.

author
Trapper777 (author)2011-10-02

Go unicycles!!! I am downloading the PDF immediatly.

author
TheHawkeye (author)2011-10-02

Cool idea! It might be easier to balance if there was a handlebar. Make it sort of like a Segway. How do you turn on this though?

author
Chikara (author)2009-11-15

omgish add a gyroscope. then it would be awesome.. and even better if you add a T bar like the legway!

author
Tenebrioun (author)Chikara2011-07-27

If you added a T-Bar, wouldn't it just be a legway?

author
pie R []ed (author)Chikara2010-03-20

the concept is meant to be simple. that's why there's no t bar. I'm just guessing here but i think this is meant to be a fun little thing not hi tech. what you just described was a segway this is and the legway are meant to be simple mechanical systems if you added a gyro it would lose its charm.

author
dragonsniper (author)2011-06-28

i think u could turn a whole lot easier if u make the wheel that's in the middle slightly larger than the side wheels
* v *

author
tranoxx (author)2010-12-21

who needs a band saw when you have a... HAND SAW!!! :)

author
bertzie (author)2009-09-07

How in gods name do you turn on that thing?

author
SCrock (author)bertzie2010-08-02

Lightly with a mallet.

author
sci5 (author)2010-05-26

The universe cycle was a great idea!! But I did make a few modification... Instead of cutting designs in the wheels, I went ahead and left them solid so they could support more weight. Also, next to the pedals on the steel pipe, I put metal hose clamps to keep the pedals from shifting.

Also, I just left 2 by 6 pedal solid instead of glueing the two cut pieces together. I just wallowed the pedal out from each side with a 7/8 in. paddle bit. I think this made the pedals stronger.

I put sand paper on the wheels facing up and it worked good on carpet but the glue I used to glue it to the wheel got a little lumpy at times so make sure you get all the lumps out. My suggestion would be to find some kind of rubber to fit around the wheels to get better traction.

author
bdring (author)sci52010-05-26

Sounds great!

Tires....

My Legway used plastic edge moulding.  It works, but degrades quickly.  My Streamroller used split rubber hose.  That has held up to a lot of riding.

author
excessive.insurgence (author)2010-05-25

could 1/2'' thick wheels work... plywood is too expensive and we dont have any 3/4'' in our garage stash

author

 I don't know.  My guess is yes.  You might want to protect the perimeter with some sort of "tire"

author
xerxesx20 (author)2009-05-06

I had a feeling the correct name was an "orbital cycle" The name spouting from the orbital motion... Perhaps somebody will clarify -- is this correct?

author
bdring (author)xerxesx202009-05-06

The working name was "unicycle with training wheels" until the second grader next door coined the name "Universe Cycle" and that stuck.

author
xerxesx20 (author)bdring2009-05-08

Haha, cool. :-)

author
yangus (author)xerxesx202010-04-11

Hmmm. well, a unicycle without a seat is called an "ultimate wheel" so I would think the nameultimate-tricycle would fit.

author
Achan20 (author)2010-03-21

kewl. id brake it or me. lol. sounds like it could use some wd40. lol. verry cool. im sure you could make some money off that.

author
bdring (author)2009-04-16

The Legway is done...check it out

front.JPG
author

 I love it

author
Bright Shadow (author)bdring2009-07-23

That = pure anti-corporate WIN.

author
the_mad_man (author)bdring2009-05-05

epic win

author
fwjs28 (author)the_mad_man2009-05-27

you mean EPIC WIN!!!!!111

author
the_mad_man (author)fwjs282009-05-28

YES, I DID!

author
fwjs28 (author)the_mad_man2009-05-28

YAAAAY!!!!!!!!!!!!!!!!!!!!!!!11111

author
DuctTapeRules! (author)fwjs282009-05-29

Huzzahs are in order!

author
fwjs28 (author)DuctTapeRules!2009-05-29

i agree me lord...HuuzzzzaaH!

author
xerxesx20 (author)bdring2009-05-06

A far superior product! No tecnical fannying about here!

author
xerxesx20 (author)bdring2009-05-06

Marvellous! I hate the Segway, this is a perfect knife in the back for the overpriced monsters!

author
reywolf (author)2009-04-25

i'm no engineer (yet) but i think i have a pretty nice way to coast...

author
bdring (author)reywolf2009-04-28

I am ready to hear any ideas. I am also willing to CNC cut pieces for anyone who wants to more the design forward. No charge...just material and shipping or less if you live in the Chicago area.

author
reywolf (author)bdring2009-05-29

it would take a bit to explain... i'll draw up some pictures and send to yoy

author
Evidenceremoved (author)reywolf2010-01-20

Make an instructible!

author
Zaphod Beeblebrox (author)2009-12-16

pretty scary goin down hills i bet!!!!!!!

author
Danrobjones (author)2009-09-11

Hi, whos the creator of this great piece of work. Because he is the genius I am addressing, Im doing a product design course at college and would love to do something based on the legway. Problem is I need a "client" who I can talk to about the designs ect ect. Would you bdring?? be interested in being that person.

author
abcnow (author)2009-07-11

so now try to make one with bigger outside wheels. then you could go faster.

author
ReCreate (author)2009-07-11

Wow this is Genius XP Thumbs up! Rated!

author
Sandisk1duo (author)2009-04-07
Look what i found!

The DuoPed!


author
Warlrosity (author)Sandisk1duo2009-07-11

I had that video on my phone

author
bounty1012 (author)Sandisk1duo2009-05-09

lol looks awesome

author
cornflaker (author)Sandisk1duo2009-04-24

Haha isn't the internet awesome lol

author
bdring (author)Sandisk1duo2009-04-07

That is so cool. I love the Internet. It makes my contraption even cooler. I like my Universe Cycle name better though.

author
Sandisk1duo (author)bdring2009-04-07

i just realized, your design has 3 wheels, the duoped has two

author
De prutser (author)2009-05-11

We had such thing on school, we called it a Pedalo

author
peterjr (author)2009-05-10

do have a video you can post

author
peterjr (author)peterjr2009-05-10

sorry i just found it, you did a great job

author
Prof I.tiki (author)2009-05-09

no offense but i don't think this is so good how do you turn? And you must fall a lot .

author
yoshhash (author)2009-03-28

wow....now if you could just mod it so that you could coast....wheels turn but your feet stay still......you could have an efficient mode of transportation!

author
hammer9876 (author)yoshhash2009-04-16

Exactly what I was thinking. I'd want to be able to coast and turn. Where are those pesky engineers when you need them?

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