speedyxjs
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 posted on 14/12/07 at 08:02 PM |
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Roll cage
Nearly finished tacking my chassis and im starting to think about the roll cage.
I want to build a full roll cage but i want to ask:
1) What size and where to get the tubing from
2) How to bend it
I would like both of the above answered with locost being top priority (after safety etc  )
How long can i resist the temptation to drop a V8 in?
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mark chandler
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| posted on 14/12/07 at 11:41 PM |
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IS&G stockholders is where my steel came from.
You need the MSA approved stuff which is CDS so you will not bend it at home but need a mandrel bender, I tried and it just wrinkled up, I think its
44mm 2.5mm wall thickness or 48mm 2mm wall, so someone else will have to confirm as I have lost my blue book.
For bends I used:
Anvil Tubesmiths (Southern) Ltd
Sedlescombe Sawmills, Cripps Corner, Robertsbridge, East Sussex, TN32 5SA, UK
Telephone: (01580) 830770
Fax: (01580) 830220
Which is not to far, they charged £15 per bend, although if I had purchased the steel from them at the same time I suspect it would have been
cheaper.
Regards Mark
[Edited on 15/12/07 by mark chandler]
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DaveFJ
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| posted on 15/12/07 at 08:39 AM |
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 £15 per bend!
Dave
"In Support of Help the Heroes" - Always
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AdamR
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| posted on 15/12/07 at 09:26 AM |
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I'm just having two cobra style hoops bent to my own design, and it's consting, um, rather more than £15 per bend!
I'm using 50 x 3 CFS for the hoops and 45 x 3 CFS for the backstays, and it's costing me nearly £200. Not the cheapest perhaps, but I
needed them at short notice.
FYI I'm using T+T Tubecraft in Woking.
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mark chandler
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| posted on 15/12/07 at 10:10 AM |
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£15 a bend, I tried myself and failed using my 2" pipe bender, with CDS you have no choice really, its tough stuff.
Material for hoop stays etc was around £60 so to create a MSA spec rear totalled £90, a full cage would be around £150.
If you draw out what you want they have all the materials so could quote on a flat pack cage, its still far cheaper than buying one I would have
thought.
How goods your welding ??? because in honesty thats the deciding factor.
[Edited on 15/12/07 by mark chandler]
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Litemoth
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| posted on 15/12/07 at 12:57 PM |
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I'm not sure but I think there's different strength grades of tube for different applications. The steel stockholders will have the info.
Benders are available to hire:
 
Description
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Volvorsport
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| posted on 15/12/07 at 01:57 PM |
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those benders will kink the tube .
www.dbsmotorsport.co.uk
getting dirty under a bus
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Slider
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| posted on 15/12/07 at 02:03 PM |
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quote:
Originally posted by DaveFJ
£15 per bend!
Thats not a bad price. I work in a forge and we charge £15 per bend in a 12 or 16mm bar curtain pole.
Slider.
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pauldm
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| posted on 15/12/07 at 02:38 PM |
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Have you tried making up your own bucks/templates & filling tube with dried sand? Lots of info on the net about it like this>
<click>
*** I want to die peacefully, in my sleep, like my grandfather,
not screaming, terrified, like his passengers.***
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JB
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| posted on 15/12/07 at 08:30 PM |
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Roll Cages
£15 per bend is perfectly reasonable especially if the job is done well.
Putting one bend in a tube is easy. Try putting 2 or even 4 bends in a tube all in the correct place and plane.
I make hardboard templates of the shape I want and supply the CDS to Planet Tube Manipulators in Leeds. The bent tube exactly matchs the template.
They also charged around £15 bend.
If bending your own keep in mind most CDs is supplied "hard as drawn" there fore it will be easier to bend if you anneal it
first...............
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cossey
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| posted on 15/12/07 at 09:04 PM |
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quote:
Originally posted by JB
If bending your own keep in mind most CDs is supplied "hard as drawn" there fore it will be easier to bend if you anneal it
first...............
just remember that if your making a proper motorsport spec cage annealing isnt allowed and it can severely weaken the cage if you over anneal it.
if you must do it do as short a section as possible that should be no longer than the bend otherwise bending will not rework all the annealed section
and you will be left with a soft part that will deform during a crash
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Litemoth
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| posted on 18/12/07 at 11:40 PM |
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Further to my previous post.
As 'Locost' is the poster's priority.....
This guy shows how to cold bend using the hydraulic bender shown above.
Note sand is essential as is using the correct tube and dies.
Linky
Personally, I would consider doing your sums & taking the job to somewhere with a CNC compound bender. It'll do it in no time and put a big
smirk on your face with the ease and accuracy it manupulates the big nasty pipe.
[Edited on 18/12/07 by Litemoth]
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