CAD Monkey
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 posted on 21/5/07 at 06:16 PM |
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Metal Question again - sorry...
Hi All,
I finally got a price today for the ERW steel for my roadster although I have a question for those more engineering-minded than me:
I'm supposed to get 25x25x1.6 ERW, but the suppliers said that the closest they had was 24.5x24.5x1.5, now to me that difference is so small it
shouldn't make a (significant) difference, but does anyone feel anything to the contrary??
Like I said, I don't see it as being a problem but god help me if I order the wrong stuff 
Thanks in advance.
Stewart
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flak monkey
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| posted on 21/5/07 at 06:21 PM |
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You sure they didnt say 25.4x25.4x1.5mm?
25.4 is exactly 1" square, but with the metric equivalent wall thickness (1.5 instead of 1.6).
Makes no difference of course. You do need to be a bit careful cutting tubes as the extra 0.4mm adds up after a little while. Other than that, makes
no odds.
David
Sera
http://www.motosera.com
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CAD Monkey
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| posted on 21/5/07 at 06:32 PM |
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quote:
Originally posted by flak monkey
Makes no difference of course. You do need to be a bit careful cutting tubes as the extra 0.4mm adds up after a little while. Other than that, makes
no odds.
David
The first of many such replies I think Just wanted to check that the wall thickness didn't make much of a difference to safety. A tenth of a
mm can be a lot in certain circumstances - like NASA, Formula 1 etc 
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Chippy
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| posted on 21/5/07 at 09:48 PM |
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Its what my chassis is constructed from, 25.4 x 25.4 x 1.5, and that is carrying my V6, plus far too much weight, Regards, Ray
To make a car go faster, just add lightness. Colin Chapman - OR - fit a bigger engine. Chippy
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Doug68
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| posted on 22/5/07 at 07:02 PM |
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I'd be careful with the grade of material you've got there, I nearly bought the wrong stuff on a similar small size difference.
In my case it was One Steel Tubeline V Ezyform which is ~40% weaker in tension.
Did you ask what grade it was when you bought it? I hate to think of you wasting your time weld weak metal together.
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MikeRJ
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| posted on 23/5/07 at 11:11 AM |
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quote:
Originally posted by Doug68
I'd be careful with the grade of material you've got there, I nearly bought the wrong stuff on a similar small size difference.
In my case it was One Steel Tubeline V Ezyform which is ~40% weaker in tension.
I guess that was for furniture construction so it's probably more ductile than the standard industrial grade stuff?
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Doug68
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| posted on 23/5/07 at 01:06 PM |
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Yep. Normal low carbon steel can vary wildly in its properties depending upon what its to be used for.
Whether its ERW or not means virtually nothing about the material.
If the supplier cant tell you what grade of material they're supplying I wouldn't buy it.
[Edited on 23/5/07 by Doug68]
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