James
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| posted on 28/4/03 at 06:43 PM |
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W/bone tubing
How important is it for the w/bone tubing to be seemless?
I've blagged some of the right size stuff for free but it's seemed.
How much more likely is seemed to break/tear etc. etc.?
All info' greatfully received!
Thanks,
James
[Edited on 28/4/03 by James]
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Viper
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| posted on 28/4/03 at 07:27 PM |
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for what it costs go for the cds, its much better suited to this application i have seen seemed stuff burst with what apeared to be little loading
Tim.
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Woody
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| posted on 29/4/03 at 12:16 AM |
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Hi , I got my cds tube from Martin Keenan , he was only too happy to send me the required amount .
but apparently Caterham use the ordinary seamed stuff and this passes the crash testing , but i still went with CDS
I got a mate to Turn the bush tubes for me on his lathe (seamless)and after he had set it for one he could make me a whole batch , he also turned me
up the nylon bushes(for the front) I am forever in his debt!
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ianhowe
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| posted on 29/4/03 at 06:03 AM |
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My Stuart Taylor supplied wishbones are made from seamed tubing.
Darren
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Cheffy
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| posted on 1/5/03 at 04:11 PM |
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Hi James,
You not going with the flat sided oval then?
Martin
Farts are like Rock'n'Roll. You love your own but you hate everybody else's. Lemmy, Motorhead.
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Dick Axtell
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| posted on 1/5/03 at 05:37 PM |
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Re: Seamless tubing
Hi all,
Discussed CDS with MK when I collected my chassis. He reminded me that some seamless is often heavily annealed, and therefore much softened. So you
could end up with bendy wishbones!!
Forgot to mention - annealing & softening on CDS tubing is required when it's used for hydraulic applications e.g. test-rigs.
[Edited on 1/5/03 by Dick Axtell]
Work-in-Progress: Changed to Zetec + T9. Still trying!!
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dozracing
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| posted on 1/5/03 at 08:04 PM |
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What you should remember is that these wishbones and the tubes are well over designed for the application. Proof is that when race car versions crash
they more often scrap the chassis than the wishbones because they are so storng and stiff is bends the chassis and not the bones.
Ideally you would have smaller bolts connecting it to the chassis, that would shear in sacrifice to the chassis.
To give you some idea of how over the top the bolts are on an F1 car the lower outboard wishbone bolt is the largest at the front and its only 8mm in
diameter. Consider the load case on an F1 car, its nearly 2 tons in weight at high speed when the downforce is on it and they corner at nearly 4g so
you have massive load on the bolt. On the top wishbones and the bolts that connect the lower wishbones to the chassis they are only 6mm diameter.
These bolts are also what holds the tethers to the upright and chassis, so in an accident they full force on the tethers.
Getting back to the subject, you'll have a hard job finding a material that isn't up to the job. Anything steel in the same thickness and
diameter will be more than up to the job.
If you are interested in full elliptical oval tube then i have some profiles of tubne i can source on my new (trial version) website. Search for tube
on www.racecarhardware.com, and look at the PDF files. You'll find several different profiles in several different materials.
Kind regards,
Darren
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stephen_gusterson
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| posted on 1/5/03 at 08:42 PM |
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so my 16mm bolts used in rod ends should be ok then 
BTW
Isnt it desirabel, in a road car, NOT to have the wheel break free- it might save the chassis but a wheel coming your way isnt healthy - ala imola
1994.
atb
steve
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James
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| posted on 21/5/03 at 03:42 PM |
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Thanks for all your replies folks. 
I wanted something to do last week so I made the top-front wishbones out of the 19mm 16gauge stuff I had.
Anyway, I cocked one up  so I get a second chance! 
The problem is that having phoned about 10 places around me none will supply me CDS tube 
So unless anyone really thinks otherwise it's gonna be the seamed stuff again???
Thanks,
James
P.S. Darren, I checked out your site. I've made the rest of my wishbones out of this sort of stuff already- the problem with the front is
getting oval stuff to fit the threaded tube and also to give enough room to fit the shocks.
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stephen_gusterson
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| posted on 21/5/03 at 06:14 PM |
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cant remember where i got this link
http://www.mailordermetals.co.uk/steel.htm
and it doesnt mention cds - but you could ask........
what about buying sopme of that oval tubing that MK will apparently sell to you?
that looks good!
atb
steve
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James
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| posted on 22/5/03 at 09:48 AM |
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quote:
Originally posted by stephen_gusterson
cant remember where i got this link
http://www.mailordermetals.co.uk/steel.htm
and it doesnt mention cds - but you could ask........
what about buying sopme of that oval tubing that MK will apparently sell to you?
that looks good!
atb
steve
Thanks Steve- I'll have a look.
I've already made all the wishbones from oval tube already (apart from the top-front).
Unfortunately, when it comes to these, it's not really possible as the distance between the bush tubes (book dimensions) is so small that the
angle where the 'arms' intersect the threaded tube is too acute so you need really long threaded tube.
The Indy uses round for both pairs of top w/bones. The GT1 meanwhile uses oval all over but it's somehow bent so it fits the threaded tube
properly.
Cheers,
James
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