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ROLL CAGE MATERIAL

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rollazuki:
Proper Dom or better roll cage tube will tie itself in knots with a 6 ton bender. The dies are the wrong sizes. However, pipe, or structural hrew pipe will fit the appropriate dies, and can be used.

To be fair, can u weld? If you need to ask the question, Id say start on a bumper or something less structural, learn what bends/welds, and what doesnt, before embarking on a cage....... :wink:

paul_humphreys:

--- Quote from: "chris9119" ---Do a search on here....., theres been loads on roll cages....

Look at the ARC/MSA sites, they have specs. for cages....

For what they cost already made, itr ain't worth doing it yourself.

Again, search on roll cages, theres some good bargains out there.

Chris
--- End quote ---


I agree, I use to be a welder, I got a price of £700 fully fitted and painted from www.whitbread-offroad.co.uk for a roll cage for my 110. So I am not even bother trying myself.

Paul

jjsaul:
i was looking at a 12ton bender with 2inch dies...im assuming that would be ok for 50mm seamless?
i have a mate who is an excellent welder (been doing it professionally for about 20 yrs)...

Terranosaurus:

--- Quote from: "jjsaul" ---i was looking at a 12ton bender with 2inch dies...im assuming that would be ok for 50mm seamless?
--- End quote ---


No it will ovalise the tube even more than usual taking all the strength out of it. For instance the MSA sets a 0.9 ratio as max allowable ovalisation. Whilst you might not need your cage to be to MSA spec they are a good set of guidelines to follow.



--- Quote from: "MSA Blue Book" ---Q1.3. Material Specifications
Specifications of the tubes used:
Minimum Material
Cold Drawn Seamless Carbon Steel
Minimum Yield Strength
350 N/mm2
Minimum Dimensions (Ø in mm)
45x2.5 or 50x2.0
38x2.5 or 40x2.0 (For roll cages/bars approved
prior to 1.1.95)
In selecting the steel, attention must be paid to obtaining good elongation properties and adequate weldability. The tubing must be bent by a cold working process and the centreline bend radius must be at least three times the tube diameter. If the tubing is ovalised during bending, the
ratio of minor to major diameter must be 0.9 or greater.
--- End quote ---

rollazuki:
a 'pipe' bender with a 2" die, is to bend a 2" nominal bore pipe. This has an outside diameter of about 2 1/2" (just under).
Thus, if you dump 50mm tube(outside diameter) in the 2" die, it WILL kink.

Borrow/blag a bender, and buy some pipe(not tube) and practise. You might be a dab hand, I wasnt, and had to pack with gravel, make multiple bends, and all sorts of stuff, but after a while, you get to the point where you are happy to make something you might let your mates see.(without fear of derision and laughter!!)

On the flip side, pony up 900 quid, buy a JD tube bender, and some 50mm DOM tube, and create a masterpiece.(I know Id like to)

Like I said before, practise on easier stuff. You have net access, check out what the bender is meant to bend, check out how pipe and tube differ in dimensions and capabilities. Be amazed how expensive DOM tube actually is :shock:

Rolla

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