World's most expensive and shortest lived unicycle axle

Why should I blame Lasco? Both ends of the axle are twisted AND bent. They just kept getting worse. Soft steel, I guess. The 24" uni.5 went for 600 miles and suffered all kinds of abuse. This one went a mile and was already goofy. Looks like I’ll be spending this winter making an axle out of heat treatable steel.

http://www.unicyclist.com/gallery/albun24

I attached an example.

p9190003.jpg

what kind of hub?

Re: World’s most expensive and shortest lived unicycle axle

Just admit it… you are a brute of a rider! :slight_smile:


The UK’s Unicycle Source


----- Original Message -----
From: “harper” <harper.b9jrz@timelimit.unicyclist.com>
Newsgroups: rec.sport.unicycling
To: <rsu@unicycling.org>
Sent: Friday, September 20, 2002 6:16 AM
Subject: World’s most expensive and shortest lived unicycle axle

>
> Why should I blame Lasco? Both ends of the axle are twisted AND bent.
> They just kept getting worse. Soft steel, I guess. The 24" uni.5 went
> for 600 miles and suffered all kinds of abuse. This one went a mile and
> was already goofy. Looks like I’ll be spending this winter making an
> axle out of heat treatable steel.
>
> http://www.unicyclist.com/gallery/albun24
>
> I attached an example.
>
>
> ±---------------------------------------------------------------+
> | Attachment filename: p9190003.jpg |
> |Download attachment: http://www.unicyclist.com/attachment/78747 |
> ±---------------------------------------------------------------+
>
> –
> harper - Gearhead
>
> -Greg Harper
>
> With Jerry Gruss at UNICON:
>
> Me: “Geez, did you see what he just did?!?”
> Jerry: “Hey, just because Kris Holm can do it doesn’t mean it’s
> possible.”
> ------------------------------------------------------------------------
> harper’s Profile: http://www.unicyclist.com/profile/426
> View this thread: http://www.unicyclist.com/thread/20524
>
>


> rec.sport.unicycling mailing list -
www.unicycling.org/mailman/listinfo/rsu
>
>

Re: World’s most expensive and shortest lived unicycle axle

:frowning: Wow, that’s ugly and sad, poor Bluni.5. When you come up with the new axle, you may want to try and make them shorter so the crank rests closer to the frame. I would think that would be stronger as well since there wouldn’t be as much area to bend and twist.

Re: World’s most expensive and shortest lived unicycle axle

could this new shifting thingy be creating heat and softing the axle?or maybe you got lucky with the 24"(unknowingly) but the 43.5 inch gear exceeds the torque factor.

Re: World’s most expensive and shortest lived unicycle axle

What were you doing when it failed? Cranking up a hill? (You wildman - so
strong!)

—Nathan

“harper” <harper.b9jrz@timelimit.unicyclist.com> wrote in message
news:harper.b9jrz@timelimit.unicyclist.com
>
> Why should I blame Lasco? Both ends of the axle are twisted AND bent.
> They just kept getting worse. Soft steel, I guess. The 24" uni.5 went
> for 600 miles and suffered all kinds of abuse. This one went a mile and
> was already goofy. Looks like I’ll be spending this winter making an
> axle out of heat treatable steel.
>
> http://www.unicyclist.com/gallery/albun24
>
> I attached an example.
>
>
> ±---------------------------------------------------------------+
> | Attachment filename: p9190003.jpg |
> |Download attachment: http://www.unicyclist.com/attachment/78747 |
> ±---------------------------------------------------------------+

Oh no! Can the Bluni.5 still play the piano or are those days over? quietly singing the blues to himself

There are steel sleeves available for cranks that are wollard out, but unfortunately I have never seen anything that can fix a wollard axle.

I wouldn’t worry about a heat-treated axle for this project. The aluminum axle coupled with a good steel crank should be fine. There is an inch- pound or foot-pound measurement provided by most crank manufactures that will eliminate any question of improper tightening of crank bolt being the problem. I’m not saying that this is the case with this failure but it’s a good idea to eliminate that variable in the future. Also know that it is also possible to tighten the crank bolt too much, resuting in the same problom

This exact problom happened often enough with our tandem that I will not install a crank without a torque wrench and a specification provided by the manufacture. Then I toque it down on the initial installation and once again after the first ride. I haven’t had a problem since.

Dan

oh…so sad…so very very sad…:frowning:

harper, do you have a web site for your blue uni.5 (like you do for the other one)? or are you just using the gallery?

-Mike

Re: World’s most expensive and shortest lived unicycle axle

Greg,

Sad news indeed. Sorry to see it…

Jason

harper wrote:
>
> Why should I blame Lasco? Both ends of the axle are twisted AND bent.
> They just kept getting worse. Soft steel, I guess. The 24" uni.5 went
> for 600 miles and suffered all kinds of abuse. This one went a mile and
> was already goofy. Looks like I’ll be spending this winter making an
> axle out of heat treatable steel.
>
> http://www.unicyclist.com/gallery/albun24
>
> I attached an example.
>
> ±---------------------------------------------------------------+
> | Attachment filename: p9190003.jpg |
> |Download attachment: http://www.unicyclist.com/attachment/78747 |
> ±---------------------------------------------------------------+
>
> –
> harper - Gearhead
>
> -Greg Harper
>
> With Jerry Gruss at UNICON:
>
> Me: “Geez, did you see what he just did?!?”
> Jerry: “Hey, just because Kris Holm can do it doesn’t mean it’s
> possible.”
> ------------------------------------------------------------------------
> harper’s Profile: http://www.unicyclist.com/profile/426
> View this thread: http://www.unicyclist.com/thread/20524

Say it aint so. Check the calander… April, April… humm, Jan, Feb, March, Ap… F@*$! -Not even neer the first. This aint funny Greg. Ok, ha, ha- joke over. Little photo shop inspired twist, yes?

Pipe dream: the axel was shrunk fit, yes? … is there any chance it could, well… er… f@*$. Can you extract the axel without junking the 2 flanges?

-Christopher

I can SPELL axle. Then I can take the wheel apart, take the hub apart, press the axle and planet cage out, press the dowels that hold the planet gears out, turn the planet cage weld off on the lathe, expand the planet cage bore by 0.005", make a new axle (or 2) out of CrMo 4140 heat treatable steel (much shorter, as Dustin suggested), harden it, weld the planet cage back on, and put it all back together again. I happen to have a CrMo 4140 steel round bar that is 1.375" diameter…as it turns out exactly the right size.

I made everything out of free, easy to machine stuff before. That’s why the axle was soft, we had a bunch of surplus 1018 3" steel round that’s worth maybe a nickel a pound. The hub halves were made from surplus 1.25 plate that we have tons of. If I had made it from 4" or 5" round it would have cost alot but I could have made it in one piece and serviceable. But it was a prototype and I wanted to know if it would work FAST and FOR CHEAP. My other option here is to make a prototype out of good material for a serviceable, shiftable production model. If I could make a fortune doing that I would drop everything else in my life and jump all over it. However, I met the entire potential market this summer and making a living doing this stuff is unlikely. It takes hobby status.

I was VERY depressed today knowing that this axle was screwed up and I was a long way from remedying the problem. Then I realized that I woke up this morning and I could walk, I’ve never gone hungry, NYC buildings didn’t collapse on me or anyone I know, no missles were fired at me, I don’t have cancer, I have two children who lived to see adulthood, I’ve been married for 30 years to someone who has not yet murdered me, and my cat is 12 years old and never had to go to the vet. All and all everything is pretty OK. And I have 6 useable unicycles and the most gorgeous 29er frame ever made.

You’ll see my dust in two weeks and Lewis will be right beside me. He’s been workin’ out!

Re: World’s most expensive and shortest lived unicycle axle

“harper” <harper.bb79m@timelimit.unicyclist.com> wrote in message
news:harper.bb79m@timelimit.unicyclist.com
>
> make a new axle (or 2) out of CrMo 4140 heat
> treatable steel (much shorter, as Dustin suggested), harden it, weld the
> planet cage back on, and put it all back together again. I happen to
> have a CrMo 4140 steel round bar that is 1.375" diameter…as it turns
> out exactly the right size.
>
>

Might I suggest S7 tool steel. It would be much tougher and can be rather
hard. Your heat treater will most likely be very familiar with this air
quench material. S7 is very repeatable in heat treat and even has one
temper range that has no size change.

To start with the exact size and then go into heat treat may result in a
part with scale and warp.

Any way, talk to whoever is going to heat treat the part for you so they
know what’s coming.

Doug

P.S. Come on, Harper, take your toe out of the sand and tell us how you
really twisted it. We want to hear about the police chase, etc.

Re: Re: World’s most expensive and shortest lived unicycle axle

In the middle of the police chase (squad cars, helicopters, AND horses) I ran into a herd of 7500 young beauties going through what appeared to be sorority rush. I slowed down to sub-mach speed so I would be visible and attempted a 720 degree uni-spin ala Dan Heaton to impress them. My clothing had already burst into flames which, in itself, causes quite a commotion. It may seem inconceivable but I failed to land the uni-spin because the axle bent.

Thanks for the tip on the S7 tool steel. I’ll check out the specs.

Sasparillimpa: The curse of warm, flat root beer. May your children’s children be strangers to condensation and carbonation, and rue this day, forever.

-Christopher Stonebender, Gypse King.

Oops! How did this get here?

Re: World’s most expensive and shortest lived unicycle axle

On Fri, 20 Sep 2002 21:39:46 -0500, harper
<harper.bb79m@timelimit.unicyclist.com> wrote:

>However, I met the entire potential market this
>summer

How terrible then that I’ve already forgotten our encounter…
Seriously Harper, your point is valid but the statement is not.

Klaas Bil

If you had this signature, I have forged it.

Chris-

This has SO upset Karen that she wants to sit next to Lewis instead of you when we see you in October and have sushi in New Orleans. But we’re both pretty old so she’ll probably forget by this evening. And anyway, I’m the one who suffers from the “limp” in “saparillimpa”. I’m going to be offroad wheelwalking by then.

Re: World’s most expensive and shortest lived unicycle axle

> I met the entire potential market this summer …

I thought Dan WAS the entire potential market. And I don’t believe you’ve
met him yet.

-mg

Re: World’s most expensive and shortest lived unicycle axle

> > I met the entire potential market this summer …

Didn’t meet me, though I know what you mean.

You’re wrong, though; Japan has MILLIONS of unicyclists and tens of millions
of speed freaks, there’s gotta be a big intersection there.

How the heck did Jack Halpern do that, by the way - take an essentially
non-unicycling country and turn it into the center of the unicycling
universe? Someone tell me a story…