[dorkbotsf-blabber] cheap wooden truss experiment

[Duane]

I found some shearing and compression numbers for wood beams in the 
"Pocket Ref". http://www.sequoiapublishing.com/pdt_pocketref3ed.htm
That can help for some of the structural analysis.  But I did not 
initially see any numbers for maximum tensions.
> Hi,
>  
> By any chance does anybody build their own wooden trusses?  If so, can 
> you advise on the strength of various materials?
>  
> For an experiment recently, I built a truss using $10 worth of cheap 
> wood from OSH.  The result was encouraging (it is cheap yet stronger 
> than expected), but I haven't fully tested the breaking limits yet.
>  
> I did a quick write-up here
>
>     http://www.quirkfactory.com/robotics/truss/
>
> Might be something to consider if you need some cheap/light/strong 
> light-duty supports.
>  
> Steve
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