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> Tubular Space Frame?, How would you do it?
plymouth37
post Mar 10 2010, 02:12 PM
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QUOTE(jd74914 @ Mar 10 2010, 06:42 AM) *

Are you still in school? If you are you should grab a copy of SolidWorks and model what you are building. Then you can use the integrated FEA software to mess with tube sizes. Its quite easy to use (and there are some great tutorials about building tube frames in it on Youtube), and would really help you out with choosing tube size. (IMG:style_emoticons/default/smile.gif)


That is actually a really good idea, the formula sae teams use solidworks to analyze their frames so I should be able to find a computer in the engineering building that has it on it. Solidworks also offers a student edition for $100 ($2900 less than retail).
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WRX914
post Mar 11 2010, 09:17 AM
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Ohhh to have the time to entertain these things!!!

Dana,

How's my old rommie doin? How is Becky? How is Laurie? Hope all is well.
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jd74914
post Mar 11 2010, 09:34 AM
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QUOTE(plymouth37 @ Mar 10 2010, 03:12 PM) *

That is actually a really good idea, the formula sae teams use solidworks to analyze their frames so I should be able to find a computer in the engineering building that has it on it. Solidworks also offers a student edition for $100 ($2900 less than retail).


Yep, I've used it on a few frames. The beam analysis feature works really well.
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plymouth37
post Mar 11 2010, 09:58 AM
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QUOTE(WRX914 @ Mar 11 2010, 08:17 AM) *

Ohhh to have the time to entertain these things!!!

Dana,

How's my old rommie doin? How is Becky? How is Laurie? Hope all is well.


Plugging away at my architecture degree and looking at grad school, Beckie and my mom are doing well. We have a little house and a couple dogs, Life is good!
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YksKrad
post Mar 14 2010, 01:47 AM
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I'm not too good with this kind of stuff, but as far as solid works goes they have a nice set of tutorials on youtube http://www.youtube.com/user/solidworks... I believe they explicitly cover frame design in the tutorials. The FSAE team I'm on uses NX for frame design, I'm not sure what is used to analyze it though....

As I said I'm not very good at this, but squares are bad, triangles are good. These two seem to jump out at me.

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Sorry, but I can't give you much better advice. I haven't really been involved in that aspect of our car's design...
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Rand
post Mar 14 2010, 10:46 PM
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My Qs are in blue. You already have the crosses to the tranny points done so those are redundant for this conversation.

Inside the blue circle... Why would you go up there? To me, the strong point to tie into is the tip of the blue arrow as that's what ties forward. I would ignore anything above it.

So top of shock tower forward to that point (my blue bar) is the strongest and most important piece in my mind.

Outer suspension point is strong by default. Inner ear needs some bracing. Doesn't make a huge difference where you go with it, I just put a blue bar to the strongest point in my thinking. Your green bar that goes lower is fine. Or just use Chris's kit (Tangerine).

Given that weight is important in your build, I just want to see you only add bracing where it's most effective, and not where it's really superfluous.


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sixnotfour
post Mar 14 2010, 10:54 PM
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Dave_Darling
post Mar 14 2010, 11:54 PM
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IIRC, the "Birdcage" Maser was a very early tube-frame design, and not necessarily all that successful I think. You'd probably do much better to check a modern racer, or maybe one of the Sports Racer (e.g., DSR) cars for ideas rather than the Maser.

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sixnotfour
post Mar 15 2010, 02:06 AM
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(IMG:style_emoticons/default/poke.gif) 200 tubes


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jd74914
post Mar 15 2010, 07:50 AM
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QUOTE(sixnotfour @ Mar 15 2010, 03:06 AM) *

(IMG:style_emoticons/default/poke.gif) 200 tubes


Eh, those are easy joints. They are almost all nice and square. Try this one, its 8 bars into one in the front and 6 into one in the back with about a 1/16" gap for welding. (IMG:style_emoticons/default/poke.gif) (IMG:style_emoticons/default/blink.gif)

Sorry for the hyjack Dana. I'll use it as an excuse to say that triangles are good, though this frame is overbuilt. Most of the tubes should be .035" wall. For reference, with all 1x.065" tubes this frame weighed 65lbs.

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sean_v8_914
post Mar 15 2010, 04:00 PM
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chop chop!


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sean_v8_914
post Mar 15 2010, 04:01 PM
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how much wire do ya think they used here?


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