Busted BlueShift

NNNNNNOOOOOOOOOO!!!! I love Blue shift...Its so pretty.....Are you gonna
be able to fix her Doc?

--
trials_uni

TRIALS 4 LIFE !

Quoted message said:

<>UNICYCLING FOR MYSLELF<><

'Check Out The Newbie Guide' (http://tinyurl.com/99yez)

koebwil said:

I'm too hardcore to type. I just punch the keyboard and delete the
letters I don't want

w00t...i got reply # 60666 in MR
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Let us know when it's back up and running. I remember reading about
that uni back in the day... It's such a cool machine.

--
unisteve

-\"i live on the edge. sometimes i fall off.\"-

la vie est belle...

harper is my hero.
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You can have the Nano back any time. I may have to go back to a smaller
tire though, I have a sneaking suspicion my 29er rim is too narrow and
not enough crown clearance for the BA.

--
UniBrier

Steve

Hop Drop & Roll

“If something is to hard to do, then it's not worth doing. You just
stick that guitar in the closet next to your
shortwave radio, your karate outfit and your unicycle and we'll go
inside and watch TV.” – Homer
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geez....to say the least, that sucks...I read about Blueshift awhile
ago, and I remember thinking "Wow, that's pretty awesome".

--
monkeyman

Interested in learning how to ride a unicycle QUICKLY AND SAFELY?
Stick with the bike
GhettoSmurf on the Lion King:

GhettoSmurf said:

the aya lu a u bubla ba la da beachy ba ba part at the begingin of the
movie

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i guess you'll to rename it the RestFrame...

..max

UniBrier said:

You can have the Nano back any time. I may have to go back to a smaller
tire though, I have a sneaking suspicion my 29er rim is too narrow and
not enough crown clearance for the BA.

The tire is the last thing to go on so it's no hurry. Did you try the
BA on your 29er frame and find that the crown clearance was too tight?

--
harper

-Greg Harper

B L U E S H I F T

*jc is the only main man. there can be no other.*

This is still my nth post....*AWESOME!!!*
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No, I was too lazy to go out in my garage to look at the current
clearance before I posted. I just looked, the Nano is not at full
pressure and there is 1/4 inch clearance.

--
UniBrier

Steve

Hop Drop & Roll

“If something is to hard to do, then it's not worth doing. You just
stick that guitar in the closet next to your
shortwave radio, your karate outfit and your unicycle and we'll go
inside and watch TV.” – Homer
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I'm weeping...what a sad day. Seems like only yesterday that 'Shifty and
I were out 'hunting eagles'
(http://www.unicyclist.com/forums/showthread.php?t=38939) together, and
now this bad news.

Harper, I hope you're able to get her fixed up and running again, as
I'd hate to have to piece-part her out across the club. But just in
case, I'd ask the rest of the SARs to PM me with your bids for the
components. I'm thinking I'll keep the Steve Howard frame, but the
tri-drilled Kookas are available, as is the seat and pedal set.

--
tomblackwood

Tailgate at your own risk...
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tomblackwood said:

I'm weeping...what a sad day. Seems like only yesterday that 'Shifty and
I were out 'hunting eagles'
(http://www.unicyclist.com/forums/showthread.php?t=38939) together, and
now this bad news.

Harper, I hope you're able to get her fixed up and running again, as
I'd hate to have to piece-part her out across the club. But just in
case, I'd ask the rest of the SARs to PM me with your bids for the
components. I'm thinking I'll keep the Steve Howard frame, but the
tri-drilled Kookas are available, as is the seat and pedal set.

I'll tear it down while you figure what you can get for the parts
independently. I rode the Big Boy in to work today. I was amazed at how
slow it was. I also botched the first freemount on the short 6" cranks.
I couldn't stop abruptly and go into a hop either. It was an alien
craft.

--
harper

-Greg Harper

B L U E S H I F T

*jc is the only main man. there can be no other.*

This is still my nth post....*AWESOME!!!*
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A sad end to a dream? Or can you get her running again?

Here's me on the far side of the world, and I knew your unicycle by
name and reputation. Think about that - because even if geared unis
become commonplace, Blueshift will always have a unique place in
history, like the Wright Bros. Flyer, Stephenson's Rocket, and
Campbell's Bluebird.

--
Mikefule

"No one likes circus skills, juggling is dire, and clowns are on
registers at most police stations."
(The late and sadly-missed Linda Smith)
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Mikefule said:

A sad end to a dream? Or can you get her running again?

That's my plan.

harper said:

I will have to disassemble the wheel on this prototype version to get
to the hub and dissect it. I will reweld the broken part and reassemble
the whole unicycle. I will try to take photos of the guts after
cleaning.

--
harper

-Greg Harper

B L U E S H I F T

*jc is the only main man. there can be no other.*

This is still my nth post....*AWESOME!!!*
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harper said:

Those with Schlumpf hubs should not worry, as I have said before,
Florian is a much better mechanical engineer than me as well as a
better machinist.

Harper, you don't give yourself enough credit. You had the vision AND
the ability to make the geared hub happen ...

After seeing this thread I wondered what weld might have broken. I was
having trouble remebering the details of the guts of the hub so I
looked at a 3D model of the hub I created some time ago using Autodesk
Inventor software. The model is of Harper's second generation hub that
can be taken apart without dis-assembling the whole wheel.

A couple evening ago I converted the Inventor model to Solidworks (my
current 3D modeling software of choice) and decided to make it
available for viewing. I created a couple Adobe Acrobat .pdf files, an
avi file that plays in Microsoft Media Player and an "eDrawing".

If you are really interested in this stuff, the eDrawing is what you
want to see. However, it requires that the eDrawing viewer be
installed on your PC. It's cool though because it allows you to
explode the assembly, rotate, zoom, pan, make parts invisible, etc.
You can download the free version of the eDrawings viewer at
solidworks.com. The eDrawing viewer will also work with AutoCad
files.

You can get the files from my gallery here:

http://www.unicyclist.com/gallery/?g2_itemId=121758

SH

--
showard
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showard said:

After seeing this thread I wondered what weld might have broken. I was
having trouble remebering the details of the guts of the hub so I
looked at a 3D model of the hub I created some time ago using Autodesk
Inventor software.

My guess is the sungear to sungear bearing assembly weld. It's the
weaker of the two welds because it has wall thickness limits imposed by
a 17mm shaft and the minimum available diameter off-the-shelf spur gear
for the application. I'll know tomorrow when I take it apart. I haven't
taken it apart for so long I had to look at the drawings to figure out
how to do it. I'm still not sure what the best way is.

--
harper

-Greg Harper

B L U E S H I F T

*jc is the only main man. there can be no other.*

This is still my nth post....*AWESOME!!!*
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I hope you get this baby back up and running. I remember, when I first
heared about Gunis, I serached and found your plans and develpoment,
then reading through the process of making it to its first rides.

--
Jerrick

~*~!I ride for Christ, Fun, Challenges, and a lot more!~*~
'!Gallery!' (http://tinyurl.com/gf2g9)
'!MRIS!' (http://tinyurl.com/jjjnz)
'Easy Tire Removal Guide.' (http://tinyurl.com/rd9ru)
My sponsor '~!SIXSIXONE!~' (http://sixsixone.com/)
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I took apart the unicycle and then the hub today. The weld that failed
was the one that I suspected. All of my photos came out so poorly I
won't post them but rather link to all of them in a folder on my
website and then throw them away later. 'The photos are here.'
(http://staff.washington.edu/gharper/BustedBlueShift/)

The first five, 404-409, show the sungear and sungear bearing assembly
removed from the hub. The weld between the two parts is still visible
and the sungear is pressed on so tightly it took some doing to get it
off. The next three shots, 410-412, show the two parts after they have
been separated. The final six, 413-418, show the two parts skimmed,
cleaned up, and pressed back together. I machined a small valley
between the two parts to get a slightly deeper penetration weld.

The larger, tapped six hole pattern attaches the torque arm to the
sungear bearing assembly. The smaller six hole pattern is there for a
1/8" drift punch in case I ever needed to get the bearings out of
there. I was glad I at least planned ahead for that. I had also
included jackscrew holes in the hub to press it apart with 1/4-20
screws. I will probably have it welded by the end of the day and
assemble it later this week. Then the wheel has to be rebuilt.

Sadly, I also noticed a rip in my airseat that I will have to deal with
eventually. When it rains it pours.

--
harper

-Greg Harper

B L U E S H I F T

*jc is the only main man. there can be no other.*

This is still my nth post....*AWESOME!!!*
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Here is an e-mail from Florian Schlumpf after I described the failure
mode to him. Understandably, with the poor photographs, it is difficult
to comment on the failure mode. From his description, his design in
this area is entirely different and, from what I can tell, stronger
from a construction standpoint and more efficient from an assembly
standpoint. My guess is that Florian cuts and case hardens his gears to
his own specifications.

Spring steel is exrtremely hard. My torque arms on my prototypes are
made of spring steel for that very reason. It is difficult to deal with
but hard, tough, and extremely strong for a given thickness.

Greg,

I don't know your design, so I don't feel competent to comment on a
failure of your hub. We do not weld any parts on our hub. The torque
lever, made of spring steel, is pressed directly on the sunwheel, held
by three noses, similar to those of an internal hub of a bicycle. Well,
as you may have heard, we too had some unexpected surprises, that made
necessary an exchange of the first batch of hubs, that were shipped in
2005. I think, a development of this kind always is a long process of
improvement. I only learnt after shipping the first hubs, what people
are doing with them!

Hope to see you again sometime, too! You won't be at Unicon this
summer?

Best regards

Florian

--
harper

-Greg Harper

B L U E S H I F T

*jc is the only main man. there can be no other.*

This is still my nth post....*AWESOME!!!*
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And here is another e-mail describing the attachment of the sunwheel to
the torque lever. This scheme requires no welds and has the potential
to use a large contact surface area

Greg-

I made as many components similar or equal to our bicycle gearing
system, in order to profit from our experience in that field. All gear
and clutch parts are case hardened, to withstand the high torques in a
bicycle bottom bracket (our test torque for the bike gearing system is
250Nm / 180 lbft). The sunwheel of our hub has three grooves, the
torque lever has three noses, that engage into these grooves.

Best regards

Florian

--
harper

-Greg Harper

B L U E S H I F T

*jc is the only main man. there can be no other.*

This is still my nth post....*AWESOME!!!*
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BlueShift is back together and has been ridden. Everything seems
hunky-dory. If my memory is correct, which I doubt more daily, there
was more backlash before I repaired it. This is what I -think- not what
I -know.- Perhaps the weld was cracked for some time and allowed some
additional slipping. I wouldn't think that would last long before it
failed completely, though.

I may switch to a different saddle arrangement. I have not yet repaired
the tear in the seam of my nylon airseat cover. The airseat I had on it
was good for distance. I wonder if nylon covers are still available?

--
harper

-Greg Harper

B L U E S H I F T

*jc is the only main man. there can be no other.*

This is still my nth post....*AWESOME!!!*
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harper said:

I may switch to a different saddle arrangement. I have not yet repaired
the tear in the seam of my nylon airseat cover. The airseat I had on it
was good for distance. I wonder if nylon covers are still available?

Hmmm, 'blue nylons' (http://www.rareads.com/scans1/32385.jpg) for a
seat cover? I can't quite picture that working too well. And poor
Blue Shift would constantly have to 'wonder if blue nylons are in
style' (http://tinyurl.com/jj942).

I don't think the old-school ballistics nylon seat covers are still
available. Bedford may still have the Rocks seat cover. The Rocks
cover is still in his price list. Otherwise the KH Fusion cover works.
Not as much volume as the ballistics nylon seat covers, but works well
enough.

--
john_childs

john_childs (att) hotmail (dott) com
Team Dirty Muni
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