thommy2
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| posted on 4/1/04 at 01:55 PM |
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What kind of tube??
Hi there,
What is the metric name for the tube, which is used in the frame. Is that 25x25x2 or what else.
Is it all the same, or are there more kinds of tubes in the same frame?
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Mark Allanson
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| posted on 4/1/04 at 02:22 PM |
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Do you have the book? If not, 1"x1" ERW is 25mmx25mmx1.6mm tube. You will also need 19mmx19mmx1.6mm, and 19mm round tube (1.6mm), some 3mm
plate, some 50mmx50mmx3.25mm ERW for making brackets
If you can keep you head, whilst all others around you are losing theirs, you are not fully aware of the situation
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thommy2
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| posted on 4/1/04 at 02:24 PM |
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ok great,
I do have the book, but could find de metric dimensions.
Thanks
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chris.russell
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| posted on 4/1/04 at 03:02 PM |
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do you know how many lengths of each size are needed, I think a length is 6m?
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PioneerX
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| posted on 4/1/04 at 03:09 PM |
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Chris,
check out
http://mcsorley.net/locost/default.htm
You'll find the corrected diagrams (the book has some dimentions wrong in it) and a cutting. I have used the book chassis design and cutting
list and all dimentions are perfect, the cutting list calls for 11 lengths of 120" (all measurements are metric and imperial, each piece of
steel has it's own engineering drawing)
My chassis was done with this and it's spot-on, you will however need the book for the TR tubes as the are not on the digrams
Simon
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chris.russell
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| posted on 4/1/04 at 03:18 PM |
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cheers Simon, will order the materials tomorrow.  building starts ASAP!
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kestrel1596
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| posted on 4/1/04 at 06:05 PM |
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Once you've decided to go with regular steel tubing instead of something a little more exotic like stainless, how important is it that you know
what type of steel alloy you want?
I've run across descriptions of low-, medium-, and high-carbon steels with number (in North America) that start at 1010 and go up from there
(1020, 1040...).
I've also heard that some builders recommend "Drawn-Over Mandrel" (DOM) ERW for extra strength for the suspension parts.
Any concerns about this?
Thanks
Kevin B.
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Alan B
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| posted on 4/1/04 at 07:57 PM |
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Kevin, you won't have much choice of steel grade in Square ERW sections..just use what they have....
Also, FYI. DOM starts off as ERW but is then drawn down to smaller sizes...it is considered to be virtually as good as seamless...many racing
organizations consider it equivalent for roll cages etc....it also is more uniform wall thickness.
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Hugh Paterson
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| posted on 4/1/04 at 08:33 PM |
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I would suggest u use CDS (cold drawn seamless) for the wishbones, better tensile strength
Shug.
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blueshift
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| posted on 4/1/04 at 10:45 PM |
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I can't remember where I was reading it, either something by Darren George or Jim McSorley I think, but it talked about 1" and 25mm square
tubing as being slightly different sizes and that it could cause problems with the slight changes in dimensions. I seem to remember a mention being
made that a good, comprehensive steel stockholder would have both types available.
Sorry I can't be more specific.
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kestrel1596
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| posted on 5/1/04 at 03:39 AM |
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Most posts that I've read indicate that 1010 is marginal, 1020 is entirely adequate, and above 1040 you're showing off.
It also seems many builders feel that the alloyed steels, like 4130 chrome-moly, are overkill.
Even if I don't have much choice on what the local dealer has, it still seems worthwhile to at least know what is going into my chassis.
I heard that DOM was a post-formed type of ERW, but I don't think I've heard of CD$ before. Is that code for "unobtainium"?
Kevin B.
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Hugh Paterson
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| posted on 5/1/04 at 12:49 PM |
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Cold drawn seamless is exactly what it says on the tin, no seams no welds. I know engineers in Canada/U.S. that use it
Maybe Im a muppet but I thought it was universally available, and its only slightly more costly but worth the expense IMHO, we build the whole
chassis in CDS btw.
Shug.
P.S. My Brother is in Alberta, will ask him tonite where he sources his stuff, designer with an engineering company in Calgary.
[Edited on 5/1/04 by Hugh Paterson]
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Rorty
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| posted on 6/1/04 at 03:51 AM |
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Hugh Paterson:
quote:
I would suggest u use CDS (cold drawn seamless) for the wishbones, better tensile strength
Either CDW or CDS is fine. BTW, I have had CDW that was marginally superior to some CDS. It depends on the material and the supplier.
CDW is so good these days, it's virtually the same spec as CDS, and you often recieve CDW when you order CDS anyway....especially if it is
superior.
Cheers, Rorty.
"Faster than a speeding Pullet".
PLEASE DON'T U2U ME IF YOU WANT A QUICK RESPONSE. TRY EMAILING ME INSTEAD!
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Alan B
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| posted on 6/1/04 at 04:20 AM |
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I'm guessing that CDW and DOM are probably the same?......it certainly seems they are made the same....ERW tube that is redrawn........probably
a nomenclature difference between the US and elsewhere......
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Matthew_1
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| posted on 6/1/04 at 06:40 PM |
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A good place to source CDS is West Yorkshire Steels http://www.westyorkssteel.com/ they deliver for a quite reasonable price as well ... cost me £7.50
for about 40Kgs worth. They are also good for more specialised alloys.
One thing to check is that you don't end up with the DOM tube used by hydraulics people - its designed to be bent so not the best stuff to
use!
[Edited on 6/1/04 by Matthew_1]
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thebutler
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| posted on 6/1/04 at 08:31 PM |
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Is CDS any more difficult to weld than ERW, due to it's higher strengh?
Steve
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Matthew_1
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| posted on 6/1/04 at 10:16 PM |
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My chassis is built almost entirely from 1" CDS tube and the welding was just the same as with ERW - though I'm now using ArgoSheild Lite
which makes everything much neater than the disposable bottles that last about 5 minutes.
The hardest part is cutting fishmouths, I've now wrecked 3 1" holesaws on my drill press cutting the damn things out!!
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Rorty
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| posted on 7/1/04 at 06:01 AM |
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Alan B:
quote:
I'm guessing that CDW and DOM are probably the same?
Correct M8.
Cheers, Rorty.
"Faster than a speeding Pullet".
PLEASE DON'T U2U ME IF YOU WANT A QUICK RESPONSE. TRY EMAILING ME INSTEAD!
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