View Full Version : Home Builders: How to make a frame leg jig
Evan Byrne
July 26th 07, 03:01 AM
[image:
http://i83.photobucket.com/albums/j288/evanbyrne/Whatsheettouse.jpg]
[image:
http://i83.photobucket.com/albums/j288/evanbyrne/Tubingtouse.jpg]
[image:
http://i83.photobucket.com/albums/j288/evanbyrne/Setupforwelding.jpg]
[image: http://i83.photobucket.com/albums/j288/evanbyrne/Weldit.jpg]
[image:
http://i83.photobucket.com/albums/j288/evanbyrne/Innertube.jpg]
[image:
http://i83.photobucket.com/albums/j288/evanbyrne/Parts.jpg]http://i83.photobucket.com/albums/j288/evanbyrne/assemble.jpg
[image: http://i83.photobucket.com/albums/j288/evanbyrne/Ready.jpg]
Note: I plan to use hose clamps instead of C-clamps as I found it tough
to setup the C-clamps.
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Evan Byrne
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tobbogonist
July 26th 07, 12:19 PM
i opened this thread all ready for a heart chortle thinking you meant
jig as in the irish dance.
It is nice though. Very nice. i am nothing of a DIY guy but i shall
bump it up for others.
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tobbogonist
Technology Savvy. David Willy.
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pdc
July 26th 07, 12:58 PM
I guess you would have to be sure that your plate was perfectly square
to the square tube. But if your uni leg is tapered then the bearing
holder would not be true hmmmmm?
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pdc
"What doesn't kill you strengthens you, what kills you strengthens your
mother"
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rob.northcott
July 26th 07, 02:13 PM
pdc wrote:
> I guess you would have to be sure that your plate was perfectly square
> to the square tube. But if your uni leg is tapered then the bearing
> holder would not be true hmmmmm?
Looks like he's holding the square tube with a right-angled magnetic
thingy so that should be pretty close at least in one plain, but it
could certainly be off sideways (or forward/back with respect to the
frame leg). And if the leg is tapered...
Come to think of it, the legs of uni frames aren't usually parallel
anyway are they? Certainly on my muni frame the legs converge in quite
a bit from the crown to the bearings and my coker frame is the opposite
(splays out).
Seems like it would be better to make the frame minus bearing holders,
put the bearing holders on the hub then offer it up to the frame and
weld it.
But I've never done it myself, so I may be talking poo. The fit of
those bearing holders is so vague anyway that it probably doesn't
matter that much - would be more important with machined bearing
holders I would imagine.
Rob
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al_lieffring
July 26th 07, 02:16 PM
Evan
I have found spring clamps like these to be real handy when clamping
pieces in place for welding.
[image:
http://www.unicyclist.com/gallery2/main.php?g2_view=core.DownloadItem&g2_itemId=553501&g2_serialNumber=1&g2_GALLERYSID=afbdf8c5bd45df81b3b0936d07cfee21]
It only takes one hand to open the clamp, leaving the other hand free
to hold the work piece straight.
This is the jig that I made up to hold the ends square while I weld the
Crazy Arm Cranks together.
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al_lieffring
Al Lieffring
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Evan Byrne
July 26th 07, 08:01 PM
pdc wrote:
> I guess you would have to be sure that your plate was perfectly square
> to the square tube. But if your uni leg is tapered then the bearing
> holder would not be true hmmmmm?
I just eyeballed the square tube. Since i use rubber between the leg
and support post there is a lot of flexability. Its really just
something for the clamps to clamp to, I can move the leg back and forth
to addjust its position on the bearing holder.
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torkerdx
July 26th 07, 10:21 PM
sweet.
i personally use magnots and balancing but i night try that
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gordito8me wrote:
> it's like running across the highway at rush hour. Dangerous, stupid,
> but not really that fun.
Unicaw89 wrote:
> Koxx rapes Torker hard!
skianduniaddict wrote:
> never give 4 teenagers a camera... they go crazy
johnfoss wrote:
> Yes, being old makes you stupid.
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unigrinin
July 31st 07, 11:08 PM
cool idea did you weld that frame with a tig welder? and do you now the
dimesions on the oval tubing. thanks
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unigrinin
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unicyclepa
August 1st 07, 12:19 AM
where did you get that oval tube from ?
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Evan Byrne
August 1st 07, 12:59 AM
Its not oval, its streamline.
[image: http://i83.photobucket.com/albums/j288/evanbyrne/IMGA0092.jpg]
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unicyclepa
August 1st 07, 01:05 AM
well where did you get that
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ntappin
August 1st 07, 02:08 AM
unicyclepa wrote:
> well where did you get that
an airplane.
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ntappin
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zfreak220
August 2nd 07, 12:18 AM
ntappin wrote:
> an airplane.
'close.' (http://tinyurl.com/3cu6ar)
'' (http://tinyurl.com/3cu6ar)
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zfreak220
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torkerdx
August 2nd 07, 12:20 AM
evan,
didn't realize that was stream line.
got a picture of the completed deal?
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torkerdx
gordito8me wrote:
> it's like running across the highway at rush hour. Dangerous, stupid,
> but not really that fun.
Unicaw89 wrote:
> Koxx rapes Torker hard!
skianduniaddict wrote:
> never give 4 teenagers a camera... they go crazy
johnfoss wrote:
> Yes, being old makes you stupid.
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Evan Byrne
August 2nd 07, 12:50 AM
torkerdx wrote:
> evan,
> didn't realize that was stream line.
> got a picture of the completed deal?
Were you at naucc? Spencer has one of my frames, its got streamline
tubing. Pay no attention to the offset seat tube, I don't do that
anymore I sware.
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Evan Byrne
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