New frame ideas.

Ok guys. i've been a fountain of ideas lately.
i've decided to release my concept frames, and i need a few questions
answered.

-Most of these frames are designed around the same type/thickness of
metal as the hunter frames, round steel, etc. what type of metal
rod/tubing are these made from? is it hollow or solid?

-What is(are) the most common width(s)for a(most) seatpost(s)

-what kind of tubing do i use for a seatpost holder? what kind of steel
tube has the inner diameter of said most common seat post width?

and having these questions asked, here are my designs.:

--the "Flow" frame. either going to be made as a trials or muni...
depending on popular vote and how well it works in reality

--The "Pricker" frame. Named for obvious reasons, the little spike
thing points backwards. I'm not sure if it's going to be so pointy, but
it'll be in that general shape. Probably for muni, because of pointy
thing and won't be safe for trials riding with all those unispins y'all
are doing.

--The "DNAA" frame. Named partly for the DNA shape, and partly for my
last name (hey, i have to name my frame after me somehow...) probably
the most practical, and will most likely be made first because of
simplicity. probably for both trials and muni... depending.

[image: http://img.photobucket.com/albums/v493/abbabibble/frames.jpg]

--
abbabibble

Cheers, Mat.
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I'm nowhere near the most qualified person to answer these questions,
but I'll tell what I at least think I know...

-Most of these frames are designed around the same type/thickness of
metal as the hunter frames, round steel, etc. what type of metal
rod/tubing are these made from? is it hollow or solid?

4130 Chromoly tubing for most, always hollow. Some frames are 4140,
some aluminium.

-What is(are) the most common width(s)for a(most) seatpost(s)

Standard cheap unicycles are mostly 22.2mm diameter. 25.4mm is the
smallest of the common sizes for the higher end unicycles I think.
27.something is another. Someone else can help out here.

-what kind of tubing do i use for a seatpost holder? what kind of steel
tube has the inner diameter of said most common seat post width?

Usually you can find anything to match the seatpost size you want,
since it's just round tubing. My personal belief is that most frames
go overkill with tubing thickness. My custom frame is going to be
thinner and pretty light...and lots of fun. A muni riding friend of
mine is making one for each of us. There's a thread on it here -
http://tinyurl.com/8d4gl - see the "future" project.

and having these questions asked, here are my designs.:

They didn't show up for me, I'm very keen to see them. I love custom
frames. 🙂

Good luck,
Andrew

--
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I'm nowhere near the most qualified person to answer these questions,
but I'll tell what I at least think I know...

-Most of these frames are designed around the same type/thickness of
metal as the hunter frames, round steel, etc. what type of metal
rod/tubing are these made from? is it hollow or solid?

4130 Chromoly tubing for most, always hollow. Some frames are 4140,
some aluminium.

-What is(are) the most common width(s)for a(most) seatpost(s)

Standard cheap unicycles are mostly 22.2mm diameter. 25.4mm is the
smallest of the common sizes for the higher end unicycles I think.
27.something is another. Someone else can help out here.

-what kind of tubing do i use for a seatpost holder? what kind of steel
tube has the inner diameter of said most common seat post width?

Usually you can find anything to match the seatpost size you want,
since it's just round tubing. My personal belief is that most frames
go overkill with tubing thickness. My custom frame is going to be
thinner and pretty light...and lots of fun. A muni riding friend of
mine is making one for each of us. There's a thread on it here -
http://tinyurl.com/8d4gl - see the "future" project.

and having these questions asked, here are my designs.:

They didn't show up for me, I'm very keen to see them. I love custom
frames. 🙂

Good luck,
Andrew

--
andrew_carter

*http://www.unicyclist.com/gallery/andrew*
unicycling tips and tutorials - http://www.unicycle.2ya.com
*'my big movies' (http://gallery.unicyclist.com/bigmovies)*
___________
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NO*,* MONEY DOWN*!*
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The Hunter frame is made from standard steel (chromoly) bicycle tubing.
It's standard bicycle tubing used for seat stays. Look at the some of
Hunter's bikes, like the 'cross bike'
(http://www.huntercycles.com/cross.html), and you'll see that he's
borrowing tubing and designs from his bikes to make his unicycle
frames. It's a good idea because he can get quality tubing and the
manufacturing techniques are the same as what he does for the bikes.

Most other unicycle frames are made from other types of tubing. I
think the Hunter is one of the few (only?) that is using bicycle
tubing.

--
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The Hunter frame is made from standard steel (chromoly) bicycle tubing.
It's standard bicycle tubing used for seat stays. Look at the some of
Hunter's bikes, like the 'cross bike'
(http://www.huntercycles.com/cross.html), and you'll see that he's
borrowing tubing and designs from his bikes to make his unicycle
frames. It's a good idea because he can get quality tubing and the
manufacturing techniques are the same as what he does for the bikes.

Most other unicycle frames are made from other types of tubing. I
think the Hunter is one of the few (only?) that is using bicycle
tubing.

--
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The 'flow' frame looks pretty cool, if it's as I see it in my head - are
these side-on views? I'd love to see pictures of some of these when
they actually get built, they look pretty radical.

john childs: woot, you got your full guinness back!

--
flyer
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The 'flow' frame looks pretty cool, if it's as I see it in my head - are
these side-on views? I'd love to see pictures of some of these when
they actually get built, they look pretty radical.

john childs: woot, you got your full guinness back!

--
flyer
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yes. they are side views. I'll check down at my local welding shop to
see how much it;ll cost me.

my favorite frame is also the flow frame. it looks the best. I hope it
works...

--
abbabibble

Cheers, Mat.
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yes. they are side views. I'll check down at my local welding shop to
see how much it;ll cost me.

my favorite frame is also the flow frame. it looks the best. I hope it
works...

--
abbabibble

Cheers, Mat.
-----------------------
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I don't see any pictures.

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loosejello
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Get this error when trying to view the image:
-The image
“'http://img.photobucket.com/albums/v493/abbabibble/frames.jpg”'
(http://tinyurl.com/735r7) cannot be displayed, because it contains
errors.

-But I was able to open it up in photoshop, and move things around so
the image would be within the 800x800 pixels to attach it.

+-------------------------------------------------------------------+
|Filename: frames.gif |
|Download: http://www.unicyclist.com/attachment/10477 |
+-------------------------------------------------------------------+

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Gilby
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Cool sounding (and looking, by Gilby's description) frames. I can't wait
to see how the Flow and/or Pricker frames turn out.

...is your last name Ababibble, by any chance?

--
burjzyntski

It's no good being Polish unless you prove it once a day.

\"every silver lining has a touch of gray.\"

\"drunk drivers run stop signs, stoned drivers wait for them to turn
green.\" -'SDASD' (http://cannabisculture.com/articles/4131.html)
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nomy last name isn't abbabibble.

and those are the exact frames. exactly. Thanks a lot, gilby!

--
abbabibble

Cheers, Mat.
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Yeah, I'm very interested to see the Flow frame in the context of round
tubing. I can't quite picture it yet.

Andrew

--
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well... um, i have yet to learn how to draw CAD...
but i'll try my best... its a realy clear picture in my head, its just
hard to make it look JUST right on paper or a computer... i might be
able to draw it and scan it into the compy tomorrow...

--
abbabibble

Cheers, Mat.
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Be sure to consider how the geometry of the frame tubing is such that it
makes the frame stiff rather than flexy. The Hunter works because the
frame tubing forms a wide triangle which is stiffer than if the two
tubes are closer together, like in the 'Vortex'
(http://www.unicycle.com/shopping/shopexd.asp?id=101) frame. The
Vortex has more flex than it should just because the geometry of the
tubes does not increase the stiffness of the frame.

It looks like all the frames you have envisioned are going to suffer
the faults of the Vortex frame, which is more flex. The design of the
frame should be such that it increases stiffness rather than decreases
stiffness. Have the tubes form more of a triangle and you may have to
add stiffener tie bars (like the Vortex has) in order to get adequate
stiffness from those frames.

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I don't want to stop you from coming up with ideas, but those frames are
going to be unneccessarily heavy for trials, muni, or freestyle. If you
are going to have the tubing cross as the drawings show, then you may
as well cut the weight and make it one straight tube. If you want to
make a cruiser, go for it, but I see absolutely no reason to cross the
tubes otherwise.

If you don't notice the difference in mass bebtween solid and hollow
rods, maybe you should do a bit more research, both theoretical and
practical, before building a frame.

Also, those designs are going to run into two issues: One, if the tubes
don't meet at the cross, they will have to go around eachother,
weakening them and making the frame very wide, and they go through
eachother then it will be super weak and break. either way that
crossing of the tubes is going to weaken the frame and make it bend
quite quickly, especially with 1/2" tubing. There's no way these
designs could work using aluminum, based on your current specs. That
joint would fail within 5 miles of the first mount, and that's being
generous.

Fabricating these things is also an issue. The average welding shop is
not equipped to do long flowing curves in tube. Replicating those
curves for two sets of tubes is hard.

Again, I don't want to stifle your creativity, but there are a mound of
practical and theoretical issues with each design you showed, and you
should address them before you go to a welding shop. Furthermore,
without more precise drawing with actual specs (have you thought about
wall thickness for the tubing?), the welder will either say come back
with a real drawing or he'll just laugh. I'm speaking from experience
here. I went to a guy and I had similar drawings. It was three months
at a drafting board before I made the first cut.

--
gerblefranklin

http://gallery.unicyclist.com/Trials-Muni

Nick's main man.

"I love freedom dearly, ideally, in theory, but in reality we're not
there yet--Not nearly."--Cold Duck Complex
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andrew_carter said:

Yeah, I'm very interested to see the Flow frame in the context of round
tubing. I can't quite picture it yet.

Scratch that. In my ignorance I assumed you were drawing flat bits
folding over. 🙂 I hope you get around to building this frame, at the
very least it will look beautiful!

Andrew

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