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Metalworking (rec.crafts.metalworking) Discuss various aspects of working with metal, such as machining, welding, metal joining, screwing, casting, hardening/tempering, blacksmithing/forging, spinning and hammer work, sheet metal work. |
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#1
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Strength of materials question: square tube vs angle iron
Hi all; about to start building a trailer. The trailer plans I
bought from trailerplans.com call for 2"x3"x1/4" angle iron. I want to use steel tube instead. Can anybody give me an idea of what size steel tube would have the same strength? Is there somewhere this can be looked up? -- -Ed Falk, http://thespamdiaries.blogspot.com/ |
#3
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Strength of materials question: square tube vs angle iron
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#4
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Strength of materials question: square tube vs angle iron
Don Foreman wrote:
On Mon, 14 Apr 2008 14:57:50 +0000 (UTC), (Edward A. Falk) wrote: Hi all; about to start building a trailer. The trailer plans I bought from trailerplans.com call for 2"x3"x1/4" angle iron. I want to use steel tube instead. Can anybody give me an idea of what size steel tube would have the same strength? Is there somewhere this can be looked up? 2" x 3" x 1/8" rectangular tube should be as strong as 2" x 3" x 1/4" angle and have about the same weight per foot. Actually it'll likely be stiffer in bending and way stiffer in twist. It'll have less strength at any one weld 'cause you're going into 1/8 inch of material instead of 1/4 inch, although that could be overcome with gussets if necessary. If the trailer is designed to have a stiff chassis and well-sprung wheels it'll probably be better with the tube; if the trailer needs to have some flex in the chassis (unlikely if it's remotely normal) then the stiffer tubing plus weaker welds may tear it apart over time. Chances are the thing was designed for angle iron because the folks doing the plans felt that'd be easiest to build, and because for a lot of things 'easy' is better than 'absolute optimal weight/strength ratio'. -- Tim Wescott Wescott Design Services http://www.wescottdesign.com Do you need to implement control loops in software? "Applied Control Theory for Embedded Systems" gives you just what it says. See details at http://www.wescottdesign.com/actfes/actfes.html |
#5
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Strength of materials question: square tube vs angle iron
You can look up or use one of the calculators to get the section
modulous for the various angles and tubes you would consider. Typically, a tube shape has more strength in both directions than a rectangular tube of the same weight per foot. But a word of warning: tube and angle fail in different modes, you really can't just sub one for the other without a bit of care. That said, 2x3x1/4 angle is fairly wimpy stuff if used as frame rails. Edward A. Falk wrote: Hi all; about to start building a trailer. The trailer plans I bought from trailerplans.com call for 2"x3"x1/4" angle iron. I want to use steel tube instead. Can anybody give me an idea of what size steel tube would have the same strength? Is there somewhere this can be looked up? |
#6
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Strength of materials question: square tube vs angle iron
I wouldn't substitute tube for the angle in a trailer application. Reason is
that short of hot dip galvanizing, you can't rust proof the inside of the tube. Water will get inside and eventually the frame will rust from the inside out leading to failure. Do yourself a favor and follow the original plans. Just my .02 YMMV. Paul "Edward A. Falk" wrote in message ... Hi all; about to start building a trailer. The trailer plans I bought from trailerplans.com call for 2"x3"x1/4" angle iron. I want to use steel tube instead. Can anybody give me an idea of what size steel tube would have the same strength? Is there somewhere this can be looked up? -- -Ed Falk, http://thespamdiaries.blogspot.com/ |
#7
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Strength of materials question: square tube vs angle iron
On Mon, 14 Apr 2008 14:45:28 -0700, 42 wrote:
(top posting compulsively fixed) "Edward A. Falk" wrote in message ... Hi all; about to start building a trailer. The trailer plans I bought from trailerplans.com call for 2"x3"x1/4" angle iron. I want to use steel tube instead. Can anybody give me an idea of what size steel tube would have the same strength? Is there somewhere this can be looked up? -- -Ed Falk, http://thespamdiaries.blogspot.com/ I wouldn't substitute tube for the angle in a trailer application. Reason is that short of hot dip galvanizing, you can't rust proof the inside of the tube. Water will get inside and eventually the frame will rust from the inside out leading to failure. Do yourself a favor and follow the original plans. Just my .02 YMMV. Paul Fill it full of linseed oil & roll it around to cover thoroughly. In general, "follow the original plans" is good advise, unless you know the ramifications of deviating from them. On the one hand I'm tempted to say that if you have to use plans to make a trailer, you should follow them. On the other hand, if you never deviate from other's plans you'll never make the mistakes you need to make to learn how to be innovative _and_ correct. Just check the safety-related stuff often, if you do deviate from those plans.... -- Tim Wescott Control systems and communications consulting http://www.wescottdesign.com Need to learn how to apply control theory in your embedded system? "Applied Control Theory for Embedded Systems" by Tim Wescott Elsevier/Newnes, http://www.wescottdesign.com/actfes/actfes.html |
#8
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Strength of materials question: square tube vs angle iron
In article ,
Tim Wescott wrote: Chances are the thing was designed for angle iron because the folks doing the plans felt that'd be easiest to build, and because for a lot of things 'easy' is better than 'absolute optimal weight/strength ratio'. That was my guess. I'm just hoping to hear something like "2x2x1/8 will do fine" -- -Ed Falk, http://thespamdiaries.blogspot.com/ |
#9
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Strength of materials question: square tube vs angle iron
In article ,
42 wrote: I wouldn't substitute tube for the angle in a trailer application. Reason is that short of hot dip galvanizing, you can't rust proof the inside of the tube. I had not thought of that particular issue. Thanks. -- -Ed Falk, http://thespamdiaries.blogspot.com/ |
#10
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Strength of materials question: square tube vs angle iron
That was my guess. I'm just hoping to hear something like "2x2x1/8 will do fine" Anybody who really knows the answer is not too likely to give you the all clear over the internet. Too many idiots out there. Not to mention there may be some reasons why the original designer chose angle iron. (other than hot rolled angle is the absolute cheapest per pound material) |
#11
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Strength of materials question: square tube vs angle iron
On Mon, 14 Apr 2008 23:30:02 -0500, RoyJ
wrote: That was my guess. I'm just hoping to hear something like "2x2x1/8 will do fine" Anybody who really knows the answer is not too likely to give you the all clear over the internet. Too many idiots out there. Not to mention there may be some reasons why the original designer chose angle iron. (other than hot rolled angle is the absolute cheapest per pound material) And anyone who thinks they know the answer without seeing the design, probably doesn't. -- Ned Simmons |
#12
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Strength of materials question: square tube vs angle iron
On 2008-04-15, Edward A. Falk wrote:
In article , 42 wrote: I wouldn't substitute tube for the angle in a trailer application. Reason is that short of hot dip galvanizing, you can't rust proof the inside of the tube. I had not thought of that particular issue. Thanks. What about putting a foam such as "great stuff" inside the tubing? My own trailer, made from tubing, is sealed on ends with great stuff, and now I wish I filled the entire tubes with it. i |
#13
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Strength of materials question: square tube vs angle iron
If any willing to buy import steel furnitures from LAHORE- PAKISTAN. PLEASE REPLY to
www.sites.google.com/site/haroonfurnitures My firm is looking stockiest and importers from all parts of the world |
#14
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Strength of materials question: square tube vs angle iron
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#15
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Strength of materials question: square tube vs angle iron
On Sat, 28 Nov 2015 06:36:01 -0600, "Lloyd E. Sponenburgh"
lloydspinsidemindspring.com wrote: fired this volley in news:2a3d1097-c162-4cc6- : My firm is looking stockiest Well, "Stockiest" companies is goodest! and importers from all parts of the world Importersing is also quite goodier. -- Courage and perseverance have a magical talisman, before which difficulties disappear and obstacles vanish into air. -- John Quincy Adams |
#16
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Strength of materials question: square tube vs angle iron
On Sat, 28 Nov 2015 07:39:00 -0800, Larry Jaques wrote:
On Sat, 28 Nov 2015 06:36:01 -0600, "Lloyd E. Sponenburgh" lloydspinsidemindspring.com wrote: fired this volley in news:2a3d1097-c162-4cc6- : My firm is looking stockiest Well, "Stockiest" companies is goodest! and importers from all parts of the world Importersing is also quite goodier. Not spamming is bestest. -- www.wescottdesign.com |
#17
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Strength of materials question: square tube vs angle iron
On Sat, 28 Nov 2015 11:02:20 -0600, Tim Wescott
wrote: On Sat, 28 Nov 2015 07:39:00 -0800, Larry Jaques wrote: On Sat, 28 Nov 2015 06:36:01 -0600, "Lloyd E. Sponenburgh" lloydspinsidemindspring.com wrote: fired this volley in news:2a3d1097-c162-4cc6- : My firm is looking stockiest Well, "Stockiest" companies is goodest! and importers from all parts of the world Importersing is also quite goodier. Not spamming is bestest. May Allah spank him BUT GOOD! -- Courage and perseverance have a magical talisman, before which difficulties disappear and obstacles vanish into air. -- John Quincy Adams |
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