Jesus-Ninja
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| posted on 5/9/08 at 12:12 PM |
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orientation of ERW
Is there an accepted way to lay out ERW for the chassis? eg welded edge up (except for the verticles)
Or does it not matter, provided that what you do on the left, you do on the right?
Suspension geometry tool here >>> http://www.locostbuilders.co.uk/viewthread.php?tid=81376
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chrisg
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| posted on 5/9/08 at 12:39 PM |
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There's probably a sensible answer on the way, but do you think you need to get out more?
Cheers
Chris 
Note to all: I really don't know when to leave well alone. I tried to get clever with the mods, then when they gave me a lifeline to see the
error of my ways, I tried to incite more trouble via u2u. So now I'm banned, never to return again. They should have done it years ago!
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Peteff
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| posted on 5/9/08 at 12:56 PM |
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When it's painted nobody will know which way up it is, left to right upside down or back to front doesn't matter.
yours, Pete
I went into the RSPCA office the other day. It was so small you could hardly swing a cat in there.
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Jesus-Ninja
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| posted on 5/9/08 at 01:00 PM |
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Great - wasn't sure if, when loaded, the tube would favour (not sure that;s the right word) one side and deform unevenly.
I'm laying out my chassis bottom rail today for welding
Suspension geometry tool here >>> http://www.locostbuilders.co.uk/viewthread.php?tid=81376
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JonBowden
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| posted on 5/9/08 at 02:07 PM |
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I'm not an expert but...
If you imagine a a length of square tube being bent such that one side is in compression, the opposite side in compression and the other two at the
sides. I would expect greatest strength when the welded side is either the compression or the tension side.
I hope that makes some sense.
Jon
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kb58
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| posted on 5/9/08 at 03:02 PM |
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I'd place the welded-side away from any drilling you're going to do because the weld is both really hard and thicker. If you're
drilling rivet holes, it can make the drill drift and be too thick for the given rivet length.
Mid-engine Locost - http://www.midlana.com
And the book - http://www.lulu.com/shop/kurt-bilinski/midlana/paperback/product-21330662.html
Kimini - a tube-frame, carbon shell, Honda Prelude VTEC mid-engine Mini: http://www.kimini.com
And its book -
http://www.lulu.com/shop/kurt-bilinski/kimini-how-to-design-and-build-a-mid-engine-sports-car-from-scratch/paperback/product-4858803.html
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Jesus-Ninja
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| posted on 5/9/08 at 03:18 PM |
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quote:
Originally posted by kb58
I'd place the welded-side away from any drilling you're going to do because the weld is both really hard and thicker. If you're
drilling rivet holes, it can make the drill drift and be too thick for the given rivet length.
Good tips - thanks 
Suspension geometry tool here >>> http://www.locostbuilders.co.uk/viewthread.php?tid=81376
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Peteff
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| posted on 5/9/08 at 03:37 PM |
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You'd have to be using marginal length rivets for the seam weld to make any difference, not the best practise.
yours, Pete
I went into the RSPCA office the other day. It was so small you could hardly swing a cat in there.
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kb58
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| posted on 5/9/08 at 04:12 PM |
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I've measured 1.5mm seams that make the metal effectively twice as thick. The proper structural rivet size may very well call out different
lengths for a material thickness change of 100%.
Mid-engine Locost - http://www.midlana.com
And the book - http://www.lulu.com/shop/kurt-bilinski/midlana/paperback/product-21330662.html
Kimini - a tube-frame, carbon shell, Honda Prelude VTEC mid-engine Mini: http://www.kimini.com
And its book -
http://www.lulu.com/shop/kurt-bilinski/kimini-how-to-design-and-build-a-mid-engine-sports-car-from-scratch/paperback/product-4858803.html
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dnmalc
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| posted on 6/9/08 at 04:01 PM |
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If you were bending the tube in the vertical plane and in isolation the best place to have the weld would be on vertical side as it would be close to
the neutral axis (the point where there is no compressive or tensile stress). However in our cars the entire chassis is being bent and thus the top
and bottom tubes tend to all be in compression or tension. In such cases it makes no difference so the advice should be to avoid placing the weld line
near the stress raisers that are created by the holes in the tubes or at points where brackets brakets are attached.
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