scootz
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| posted on 29/12/11 at 08:19 PM |
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Triangulation
Is there a 'correct' way to triangulate a square or rectangle?
Top... Middle... Bottom???
It's Evolution Baby!
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sebastiaan
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| posted on 29/12/11 at 08:20 PM |
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Top. The idea is to NOT introduce bending moments in any of the chassis members in a spaceframe. Which the other two options do.
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scootz
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| posted on 29/12/11 at 08:22 PM |
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Cheers Sebastiaan!
It's Evolution Baby!
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sebastiaan
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| posted on 29/12/11 at 08:24 PM |
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some basic reading here: http://www.preengineeredbuilding.co.in/space-frame.html
edit: link fixed. I hope...
[Edited on 29/12/11 by sebastiaan]
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scootz
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| posted on 29/12/11 at 08:26 PM |
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That links not working Sebastiaan (at least not for me).
It's Evolution Baby!
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imp paul
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| posted on 29/12/11 at 08:28 PM |
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no mate it seems to be faulty 
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spiderman
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| posted on 29/12/11 at 08:29 PM |
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Top is best but hardest to weld due to restriction of space to get the welding torch close enough to the weld. Using round tube as the brace helps
with access.
Ask me how I know! 
Spider
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SCAR
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| posted on 29/12/11 at 08:52 PM |
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Not a great deal of differance providing the offset from the corner is kept small and best would be subject to the direction and position of the loads
that are to be imposed.
Item 1 would distribute any imposed loads more uniformly.
And there are only two varaitions shown, images 2 and 3 are the same thing veiwed from a different position.(for a square)
[Edited on 29/12/11 by SCAR]
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Neville Jones
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| posted on 29/12/11 at 08:53 PM |
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I do 99% of mine by intersecting centrelines, as similar to the top.
Problems with welding torch size??? What size shroud are you using? I use a 12mm and a 10mm, never had one I couldn't get to yet.
Cheers,
Nev.
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Wadders
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| posted on 29/12/11 at 08:58 PM |
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That's the correct way, tube centrelines should always intersect....well thats what they taught us at school anyhow,
not always possible in practise though.
Al.
Originally posted by Neville Jones
I do 99% of mine by intersecting centrelines, as similar to the top.
Problems with welding torch size??? What size shroud are you using? I use a 12mm and a 10mm, never had one I couldn't get to yet.
Cheers,
Nev.
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Confused but excited.
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| posted on 29/12/11 at 09:53 PM |
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+1
You actually answered your own question. Only the top method produces triangles.
Tell them about the bent treacle edges!
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designer
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| posted on 29/12/11 at 10:32 PM |
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Top.
All the centre lines of the tubes should meet at the same point.
http://www.shedworks.eu/hints.html
Column 2, 5 down.
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plentywahalla
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| posted on 29/12/11 at 10:48 PM |
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quote:
Originally posted by Confused but excited.
+1
You actually answered your own question. Only the top method produces triangles.
Exactly ... The clue is in the question. Only the top one creates triangles, the rest are quadrilaterals which are inherently weaker.
Rules are for the guidance of wise men ... and the obedience of fools. (anon)
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loggyboy
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| posted on 29/12/11 at 11:22 PM |
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Whilst the above comments are of course correct, the location within the chassis may not require 100% triangulation and the lower 2 verions could well
be acceptable if it was practically difficult to achieve perfect triangles.
For example:
the forces applied to the front box would not require perfect triangulation in that position.
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Volvorsport
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| posted on 29/12/11 at 11:26 PM |
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imagine you were pinning all the joints ................
www.dbsmotorsport.co.uk
getting dirty under a bus
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scootz
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| posted on 30/12/11 at 08:53 AM |
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Cheers fellas!
Loggyboys pic shows why I was asking... I've seen loads of chassis with diagonal braces like this. In fact, I rarely see perfect triangles.
Maybe I should have used the word diagonal instead of triangulation in the thread title.
It's Evolution Baby!
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iank
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| posted on 30/12/11 at 11:12 AM |
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Every chassis is a compromise somewhere, a perfect spaceframe is already compromised by the need to put people, engines, fuel tanks etc in
somewhere.
If you can get every tube into a perfect triangle then that's great, but if you need a steering arm to go where the perfect tube would then
it's the chassis that's going to end up compromised. Like most things in life do your best, but don't kill yourself if it's
not perfect.
Having said that some manufactures seem to do rather better than others in this area.
--
Never argue with an idiot. They drag you down to their level, then beat you with experience.
Anonymous
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