ELL
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BrokenBiker
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firstly, what does the frame need to do?
i would suggest more cross bracing/triangulation of bracing but anything you do will realistically add weight.
i would suggest more cross bracing/triangulation of bracing but anything you do will realistically add weight.
gaz1
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if they are doors wrong style and poor strengthening due to your cutting shorter
door style cut the lot out in the middle add pieces every 1/4 way down its length put strengthener from the first 1/4 back up to the top and bottom piece about halfway across
door style cut the lot out in the middle add pieces every 1/4 way down its length put strengthener from the first 1/4 back up to the top and bottom piece about halfway across
chrismac
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agreed, its the wrong thing which is not fit for purpose.
Lot's of wood? It's the wrong material choice and design, additions alone aren't going to achieve what you are after.
You could cut out all the cross bars and add angle or box connecting diagonally opposite corners but going that far you would be better starting again with box which will end up better anyway.
I can't see what it's trying to be.
But if the cross pieces fully met the main structure so their ends could be welded to the angle. It looks like the corners of the main frame don't meet either - fully welded corners would stiffen it a good amount
If it's lightweight angle, it's not going to be very stiff in the first place.
But if the cross pieces fully met the main structure so their ends could be welded to the angle. It looks like the corners of the main frame don't meet either - fully welded corners would stiffen it a good amount
If it's lightweight angle, it's not going to be very stiff in the first place.
Erie Fred
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The excellent book "Design of Weldments" from Lincoln Electric written by the late Ohmer Blodgett
shows exactly what your asking.
3 different types of construction, actual twist angles shown using the same weight.
shows exactly what your asking.
3 different types of construction, actual twist angles shown using the same weight.
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Hard to tell from those pictures but it looks like the thing is only tacked together.
I have made frames from 50x50x6 angle iron and made accurately and fully welded they are structurally strong, especially if you add cross braces.
Nearly every home made car trailer uses angle iron for the chassis and even without the upper half it is fairly rigid.
That being said if it was made out of box section it would be stronger and weigh the same because your box section would have a lighter wall.
Eg a 2m length of 50x50x6 angle will weigh roughly the same as a 2m length of 50x50 box with a 3mm wall thickness.
I have made frames from 50x50x6 angle iron and made accurately and fully welded they are structurally strong, especially if you add cross braces.
Nearly every home made car trailer uses angle iron for the chassis and even without the upper half it is fairly rigid.
That being said if it was made out of box section it would be stronger and weigh the same because your box section would have a lighter wall.
Eg a 2m length of 50x50x6 angle will weigh roughly the same as a 2m length of 50x50 box with a 3mm wall thickness.
Gareth J
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It's hard to tell what's what from the photos. But, in principle, this is the most material efficient addition that comes to mind too;
BrokenBiker
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Well...that's another one I need to buy...gotta stay off these posts they get expensive
It depends on what way you want to stop the twisting, on the vertical twist, i used to build angle iron door frames and use a piece of 16mm round across the bottom to stop the twisting during transit, the same principle can be used ie weld a piece on the inside top and bottom and like others have said shouldve probably used box but either round or flat would do it, if you was to use flat you might have to place it so it doesnt sit flat with the angle or it will twist with the torsion. This is only mainly for the verictal twist it looks like you already have members that will support it horizontally
zzr1200
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Pisssssss...BB...Well...that's another one I need to buy...gotta stay off these posts they get expensive
.... 
Design Of Weldments Omer W. Blodgett : omer w. blodgett : Free Download, Borrow, and Streaming : Internet Archive
design of weld structure.best book for design and any common understanding of design is available really great book for undergraduate students.thank you Mr....
archive.org
BrokenBiker
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amazing, thanksPisssssss...BB...
Design Of Weldments Omer W. Blodgett : omer w. blodgett : Free Download, Borrow, and Streaming : Internet Archive
design of weld structure.best book for design and any common understanding of design is available really great book for undergraduate students.thank you Mr....archive.org
perfect , many thanksPisssssss...BB...
Design Of Weldments Omer W. Blodgett : omer w. blodgett : Free Download, Borrow, and Streaming : Internet Archive
design of weld structure.best book for design and any common understanding of design is available really great book for undergraduate students.thank you Mr....archive.org
in reading lies knowledge , in knowledge lies wisdom .I don’t think reading a book will help stop an angle iron frame like that from twisting. Outer frame as a minimum needs to be c section or box.
Bob
wow theres a blast from the past , it was written on the cover of the first encyclopaedia I owned ,,,, what a flash back on a Sunday morn.
