02GF74
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| posted on 24/10/08 at 10:22 AM |
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tube bender?
for putting bends in the frame tube, would something like this work? (tubing 1 1/4 or 1 1/2 DOM).
Am I right in thinking these will kink the tube?
The ones which have a roller that pull the tube into the former won't?
like this but on a bigger scale:
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DarrenW
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| posted on 24/10/08 at 10:28 AM |
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Most cheaper tube benders will deform the radius and kink thicker tube. Depends what you want to do. A mate of mine has made roll cages with the top
unit - but nothing that has to be rated or pass scrutineering.
Iirc to bend with no kinks or distortion you have to use a mandrel bender which is probs more expensive for the kit. From a visual point of view i
dont like the non mandrel forms.
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Dangle_kt
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| posted on 24/10/08 at 10:28 AM |
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Not sure about the bottom one, but the top one is a pipe bender not a tube bender. There is a big difference in price and quality.
Check the following vid on youtube as to how not to kink the tube
http://uk.youtube.com/watch?v=GWT3N3m4bE4
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m8kwr
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| posted on 24/10/08 at 10:39 AM |
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It does depend on what you are willing to spend on one.
I was thinking about bending my own tubing, but the cost of purchasing a decent machine to do it, is beyond an amateur builders budget.
When i was looking i found this company (link below), which had a one that bent tubing, but it is manual, and still costs nearly £1000, but they do
offer another one, which bends tube and square tubing, but that is well over £1000 
Link
I do believe it is best to use non seemed tubes, i think you need to use CDS (Cold Drawn Steel), someone correct me if i am wrong please.
If you are just kinking it, then i would of thought it would of been ok, it is when you are looking to put 45 degree angles, that would be a cause for
concern. But even so i would use CDS anyway, this is more costly then the seemed stuff. I think they use the same steel for scaffolding etc.
HTH
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02GF74
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| posted on 24/10/08 at 10:45 AM |
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^^^^ can't acceess u-tube.
basically mandrel bender had a big disc with a groove machine in it and a second piece that runs radially to the disc to pull the tube into the
groove?
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daviep
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| posted on 24/10/08 at 11:07 AM |
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quote:
Originally posted by 02GF74
^^^^ can't acceess u-tube.
basically mandrel bender had a big disc with a groove machine in it and a second piece that runs radially to the disc to pull the tube into the
groove?
Also crucially it also has a mandrel inside the pipe which supports the pipe where the bend is being made.
Davie
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SeaBass
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| posted on 24/10/08 at 11:19 AM |
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Mandrel can be seen below...
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nick205
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| posted on 24/10/08 at 11:56 AM |
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Have a word with "minicooper" (David) on here. he has a manual floor mounted tube bender he imported from the states at fairly reasonable
cost. I've seen the work he's done to produce a roll cage and various other bits - looks to work very well.
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Alan B
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| posted on 24/10/08 at 12:29 PM |
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quote:
Originally posted by 02GF74
......basically mandrel bender had a big disc with a groove machine in it and a second piece that runs radially to the disc to pull the tube into the
groove?
Nope, but that does describe the type of bender that works well until you go into very thin wall stuff...then you do need the mandrel.
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trikerneil
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| posted on 24/10/08 at 01:07 PM |
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I made my own tube bender.
LINKY
Does need a bit of machining though.
Neil
ACE Cafe - Just say No.
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02GF74
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| posted on 24/10/08 at 01:12 PM |
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thx - I have seen similar. Unfortunately I done have any machine tools, other than drill press, to make something like that.
.... but I have got info. about making one from a fiesta brake drum! 
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liam.mccaffrey
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| posted on 24/10/08 at 02:20 PM |
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linky
heres my protool bender thread
Build Blog
Build Photo Album
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Rudy
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| posted on 24/10/08 at 07:46 PM |
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why do you need a bender machine? You can bend tube with your hand , isn't it true?
Sorry about my English
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Rudy
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| posted on 24/10/08 at 08:12 PM |
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quote:
Originally posted by 02GF74
.... but I have got info. about making one from a fiesta brake drum!
Very interesting, can you explain please ?
Sorry about my English
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nick205
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| posted on 24/10/08 at 10:02 PM |
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quote:
Originally posted by liam.mccaffrey
linky
heres my protool bender thread
That's the one I was thinking of 
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trikerneil
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| posted on 25/10/08 at 05:22 AM |
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quote:
Originally posted by Rudy
quote:
Originally posted by 02GF74
.... but I have got info. about making one from a fiesta brake drum!
Very interesting, can you explain please ?
Aha! Blackjack's Bike Tech, have a look HERE
HTH
Neil
ACE Cafe - Just say No.
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Rudy
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| posted on 25/10/08 at 06:11 AM |
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thankyou Neil,
I prefer yours , but I like the idea of the drum, it could be possible to do a mix , a idraulic drum.
Sorry about my English
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trikerneil
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| posted on 26/10/08 at 10:12 AM |
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The drum is only a way of making a former.
You could indeed make a mix of my bender and Blackjack's.
Neil
ACE Cafe - Just say No.
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02GF74
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| posted on 26/10/08 at 10:02 PM |
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^^^ yep - that is the site - I wasn't able to finid it.
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