Unicyclist Community

Go Back   Unicyclist Community > Unicycling Discussion > General Unicycling Discussions

Reply
 
Thread Tools Search this Thread Rate Thread Display Modes
Old 2012-04-30, 05:54 PM   #16
maestro8
is what it is
 
maestro8's Avatar
 
Join Date: Sep 2004
Location: hella Nor Cal
Age: 42
Posts: 6,622
I've been riding with a similar setup for a couple thousand km, and I have to say it is inherently a design for failure.

The problem spot is at the seat rail to rail adapter interface. The addition of the long lever arm to the front of the rail bracket transmits a lot of torque to those rails, ultimately leading to broken rails. They're just not thick enough to handle the stress.

I've tried welding some cross-braces between the rails, and even welding the rails to the rail adapter. There is no fix that lasts for more than a few hundred km, or a few hard drops.

Yesterday was the failure of my 2nd rail adapter, even after having beefed it up with lots of ugly welding. I am now completely done with this design, as much as it saddens me. I've already taken a couple 10 mile walks to a trailhead... not again.

I'll get some pictures and post them soon for illustration.
__________________
"The trouble with the world is that the stupid are cocksure and the intelligent are full of doubt." - Bertrand Russell
maestro8 is offline   Reply With Quote
Old 2012-04-30, 06:50 PM   #17
knoxuni
wes style!!
 
knoxuni's Avatar
 
Join Date: Jun 2010
Location: central ohio
Age: 24
Posts: 5,978
Send a message via Skype™ to knoxuni
very cool. i really like it
__________________
Roses are red, violets are blue, may I procreate with you so I can ride a g32!! - Alan hogan
knoxuni is offline   Reply With Quote
Old 2012-04-30, 07:37 PM   #18
brycer1968
Brycer1968
 
brycer1968's Avatar
 
Join Date: Dec 2005
Location: Mayhem, OR
Age: 51
Posts: 933
Quote:
Originally Posted by maestro8 View Post
I've been riding with a similar setup for a couple thousand km, and I have to say it is inherently a design for failure.

The problem spot is at the seat rail to rail adapter interface. The addition of the long lever arm to the front of the rail bracket transmits a lot of torque to those rails, ultimately leading to broken rails. They're just not thick enough to handle the stress.

I've tried welding some cross-braces between the rails, and even welding the rails to the rail adapter. There is no fix that lasts for more than a few hundred km, or a few hard drops.

Yesterday was the failure of my 2nd rail adapter, even after having beefed it up with lots of ugly welding. I am now completely done with this design, as much as it saddens me. I've already taken a couple 10 mile walks to a trailhead... not again.

I'll get some pictures and post them soon for illustration.
Yes, pics would be great.
I've been using this on fusion freeride saddles and CF saddle bases for several years and about 20 of these are now out in use with local riders and have just seen one come back to me with bent rails. I've experimented with reinforcing the rails with custom plate steel gussets and it fixed this problem by effectively shortening the rail length at each end. Since this hasn't happened but once, I haven't seen the need to reinforce the rails on the rest of the ones I ride.
Also, the bent rail problem is much less likely when the shaft is solidly bolted through the lift handle reinforcing the saddles existing stiffener plate. Later pics will show this detail, which is one of the last fabrication steps
Brycer
__________________
Brycer1968,
Mayhem on one-wheel since 1968
brycer1968 is offline   Reply With Quote
Old 2012-04-30, 08:56 PM   #19
maestro8
is what it is
 
maestro8's Avatar
 
Join Date: Sep 2004
Location: hella Nor Cal
Age: 42
Posts: 6,622
Quote:
Originally Posted by brycer1968 View Post
Also, the bent rail problem is much less likely when the shaft is solidly bolted through the lift handle reinforcing the saddles existing stiffener plate.
I don't see any bolts in the pictures you've attached. Could you illustrate? I don't understand how the rails are reinforced in this manner.

In my design, I cut the brake extension off and welded my shaft / handle assembly directly to the vertical plate. The only bolts were between the stiffener plate and the seat.
__________________
"The trouble with the world is that the stupid are cocksure and the intelligent are full of doubt." - Bertrand Russell
maestro8 is offline   Reply With Quote
Old 2012-04-30, 11:10 PM   #20
MJS
36er <3
 
Join Date: Apr 2011
Location: Vancouver, WA
Age: 24
Posts: 127
Quote:
Originally Posted by brycer1968 View Post
well . . . . I could build another one for you. . . . .
Send me a PM if you want to try life on the black side

Brycer
I most definitely want to try going black! I will be PM'ing you sometime in the next few weeks, sir!
__________________
"Why'd you put your beer down for this photograph?"
-maestro8

"I will irradiate my gonads in the name of unicycle science."
-GizmoDuck
MJS is offline   Reply With Quote
Old 2012-04-30, 11:37 PM   #21
DavidHood
Raising my own riding partners
 
DavidHood's Avatar
 
Join Date: Apr 2010
Location: Louisville Kentucky
Age: 51
Posts: 694
On this subject, there is a reply over in the Trading Post forum that wins the award for the funniest post of all time. Not many things make me literally laugh out loud each time I read it and there have been several. Ready for a giggle? Do yourself a favor and read the thread from the beginning to put the whole thing into context.
DavidHood is offline   Reply With Quote
Old 2012-05-01, 03:00 AM   #22
brycer1968
Brycer1968
 
brycer1968's Avatar
 
Join Date: Dec 2005
Location: Mayhem, OR
Age: 51
Posts: 933
Quote:
Originally Posted by maestro8 View Post
I don't see any bolts in the pictures you've attached. Could you illustrate? I don't understand how the rails are reinforced in this manner.

In my design, I cut the brake extension off and welded my shaft / handle assembly directly to the vertical plate. The only bolts were between the stiffener plate and the seat.
Ok, I do see how your bar could bend the rails with that description. The stainless bolt head visible in this pic goes through a drilled hole in the lift handle and into a steel threaded barrel welded at an angle into the Black Cock shaft. This solidly connects the black cock with the saddle stiffener and creates a much stronger handlebar than one that is left un-bolted. The bolt head is countersunk into the lift handle so it won't snag on anything. The layout for this connection took me a while to figure out, but it works great.
Attached Images
 
__________________
Brycer1968,
Mayhem on one-wheel since 1968
brycer1968 is offline   Reply With Quote
Old 2012-05-01, 07:46 PM   #23
uniShark
muni commuter
 
uniShark's Avatar
 
Join Date: Aug 2009
Location: Missoula, MT, USA
Age: 47
Posts: 1,365
Quote:
Originally Posted by brycer1968 View Post
Ok, I do see how your bar could bend the rails with that description. The stainless bolt head visible in this pic goes through a drilled hole in the lift handle and into a steel threaded barrel welded at an angle into the Black Cock shaft. This solidly connects the black cock with the saddle stiffener and creates a much stronger handlebar than one that is left un-bolted. The bolt head is countersunk into the lift handle so it won't snag on anything. The layout for this connection took me a while to figure out, but it works great.
With the red and white color scheme, that one looks more like a doggy dong to me.

As intrigued as I am by your design, I'm going to stick with the T-bar for now. I like having two handles offset from center, to make it easier to grasp them from the side. Your design would have to be at least 10-12" longer for me to reach past my own personal attributes to use it.

(Hmm, sorry if I'm coming across as a bastard, I realize I'm not qualified given that I'm nowhere near Portland. )
__________________
My 29er is my little wheel. Roll it, baby!

pLs forgve anu typist imak win positing forum my fone.
uniShark is offline   Reply With Quote
Old 2012-05-01, 09:55 PM   #24
maestro8
is what it is
 
maestro8's Avatar
 
Join Date: Sep 2004
Location: hella Nor Cal
Age: 42
Posts: 6,622
Quote:
Originally Posted by brycer1968 View Post
The stainless bolt head visible in this pic goes through a drilled hole in the lift handle and into a steel threaded barrel welded at an angle into the Black Cock shaft. This solidly connects the black cock with the saddle stiffener and creates a much stronger handlebar than one that is left un-bolted.
Hmm, that doesn't do anything to reinforce the rails though... only the handle. Am I right? Is the plastic handle the extra link between shaft and plate? I don't have much faith in that plastic.

In my design I wanted to be able to use the lift handle. I don't see that possibility in your design.

Here's what's left of my design. I really liked it... it was made from some drop-handles from an old 10-speed. It offered a number of hand positions, worked well with a computer and a brake, and lasted for quite some time. I might try building a second version once I get my man-cave sorted...
Attached Images
   
__________________
"The trouble with the world is that the stupid are cocksure and the intelligent are full of doubt." - Bertrand Russell
maestro8 is offline   Reply With Quote
Old 2012-05-02, 12:41 AM   #25
brycer1968
Brycer1968
 
brycer1968's Avatar
 
Join Date: Dec 2005
Location: Mayhem, OR
Age: 51
Posts: 933
Quote:
Originally Posted by maestro8 View Post
Hmm, that doesn't do anything to reinforce the rails though... only the handle. Am I right? Is the plastic handle the extra link between shaft and plate? I don't have much faith in that plastic.

In my design I wanted to be able to use the lift handle. I don't see that possibility in your design.

Here's what's left of my design. I really liked it... it was made from some drop-handles from an old 10-speed. It offered a number of hand positions, worked well with a computer and a brake, and lasted for quite some time. I might try building a second version once I get my man-cave sorted...

Whoooah, I think I've punished my black cock pretty hard over the years with UPDs and drops, but it still looks pretty good and all its parts are straight and intact. . .OOh man, that looks like it saw some hard living! Ouch!

One possible difference is that I run mine with Thomson seatposts which have a really big/wide grip on the rails and help to better spread the load on the rails.
Cheers,
Brycer
__________________
Brycer1968,
Mayhem on one-wheel since 1968
brycer1968 is offline   Reply With Quote
Old 2012-05-02, 06:17 PM   #26
maestro8
is what it is
 
maestro8's Avatar
 
Join Date: Sep 2004
Location: hella Nor Cal
Age: 42
Posts: 6,622
Quote:
Originally Posted by brycer1968 View Post
OOh man, that looks like it saw some hard living! Ouch!
I've done a couple hundred km of Coker muni and a ~500km tour of Vietnam with that rig, in addition to lots and lots of smooth rolling on pavement. Overall, I'm happy with how long my handle's lasted, but disappointed that I have to take it out to the field and shoot it...

Quote:
One possible difference is that I run mine with Thomson seatposts which have a really big/wide grip on the rails and help to better spread the load on the rails.
Yeah, this post only grips the rails in two places... the interior of the clamp is hollow. I'm no materials engineer so I can't tell if it would be better to grip more of the rail... but in either case the rails have to bear the entire load of every drop and fall.

I love the design of the new KH adjustable seatpost but unfortunately it isn't made in 22.2 mm diameter (needed for the OG Coker 36er)... so I might have to roll my own... we'll see.
__________________
"The trouble with the world is that the stupid are cocksure and the intelligent are full of doubt." - Bertrand Russell
maestro8 is offline   Reply With Quote
Old 2012-05-03, 02:08 AM   #27
brycer1968
Brycer1968
 
brycer1968's Avatar
 
Join Date: Dec 2005
Location: Mayhem, OR
Age: 51
Posts: 933
How the delrin ball stays on the black cock

Worked on Black Cocks today. Milled the holes for the delrin ball anchors and welded them in place. The TIG welder with pulser makes nice looking welds, pity that I have to blend them (grind them flush with the bar outer diameter) so the brake lever will fit down on the shaft.

Brycer
Attached Images
   
__________________
Brycer1968,
Mayhem on one-wheel since 1968

Last edited by brycer1968; 2012-05-03 at 02:09 AM.
brycer1968 is offline   Reply With Quote
Old 2012-05-20, 08:58 AM   #28
brycer1968
Brycer1968
 
brycer1968's Avatar
 
Join Date: Dec 2005
Location: Mayhem, OR
Age: 51
Posts: 933
Cocks almost done

These Pics are all of the lift handle bolt anchor which will keep the handlebar bolted to a hole in the saddle lift handle. The hard part is sinking all the threaded fasteners into the bar so brake levers can still be slid down over the shaft.
The pics:
*After I welded it into the hole I milled into the shaft
*Then cleaning up threads with a tap
*After blending (bandfiling) the weld bead flat
*Prepped for painting in my "paint booth" in my front yard.

Brycer
Attached Images
      
__________________
Brycer1968,
Mayhem on one-wheel since 1968

Last edited by brycer1968; 2012-05-20 at 09:04 AM.
brycer1968 is offline   Reply With Quote
Old 2012-05-20, 08:58 PM   #29
brycer1968
Brycer1968
 
brycer1968's Avatar
 
Join Date: Dec 2005
Location: Mayhem, OR
Age: 51
Posts: 933
Tis done

I left the grip off so the brake lever can be slid down into position. . .then the grip goes on.
This one is getting ready to take a long trip down South
Attached Images
      
__________________
Brycer1968,
Mayhem on one-wheel since 1968

Last edited by brycer1968; 2012-05-20 at 08:59 PM.
brycer1968 is offline   Reply With Quote
Old 2012-05-21, 01:03 AM   #30
napalm
Because i can.
 
napalm's Avatar
 
Join Date: May 2003
Location: Canberra, Australia
Age: 31
Posts: 998
Its good to see people trying different things with handles. Your Black C**k design looks interesting. I would suggest that in any future batch you think about ditching the KH front bumper all together. With the shaft running practically through it anyway it kind of becomes pointless. With a nice substantial handle out the front the traditional bumper is only useful for those people unwilling to spend a bit of time working with a new set up that is ultimately superior in every way.

Other things you could consider would be to do away with the KH rail adapter which is heavy, and prone to failure and just mount your handle directly to the CF base (which is plenty stiff).

And I know this is a bit pedantic- but you could use a better attachment method for all your hardware/bumpers to the CF base. A guy who used to post here called Fraggle had a nice tutorial about using flange nuts and dome head allen bolts for CF base mods. Here is the link http://www.unicyclist.com/forums/showthread.php?t=77806

As for me, all you guys with Brycers black C**k handles are missing out on the fun, pleasure and benefits of a dual c**k set up like mine!

Good to see you backyard mechanics (Brycer/ Nurseben) making stuff where the market is unwilling to supply it.

Mark
Attached Images
 
__________________
Find out about my latest Enduro XC rides and races at my blog.

http://www.markandhisunicycle.wordpress.com
napalm is offline   Reply With Quote
Reply

Tags
black, coc, workshop, xxx


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Why am I not faster with shorter cranks? (Oh no, not crank length again...) Twente Muni General Unicycling Discussions 34 2018-06-29 11:54 PM
Independence Pass, Co. aspenmike General Unicycling Discussions 10 2011-05-31 01:21 AM
Unicycle Rickshaw Co. Aillaragis General Unicycling Discussions 7 2011-01-28 05:36 PM
Co kupić po QUAX 20'' GustaFF Polskie Forum Monocyklowe 14 2010-12-27 08:53 PM


All times are GMT. The time now is 12:18 PM.


Powered by vBulletin®
Copyright ©2000 - 2015, Jelsoft Enterprises Ltd.
Copyright © 2001-2016 Gilby
You Rated this Thread:
Page generated in 0.10170 seconds with 12 queries