Subject:
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Re: Pneumatic Arm
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Newsgroups:
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lugnet.technic
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Date:
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Sat, 17 Jul 2004 19:53:43 GMT
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Viewed:
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3527 times
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Hi Kevin,
>
> Congratulations on a beautiful creation! I like it a lot. I appreciate all
> the thought that went into the design.
Thanks ;o)
>
> I'm also envious of all your clear pneumatic hose ;^)
Here is their source: http://news.lugnet.com/technic/?n=11759
>
> Studless beams work well in some applications, and not well in others. As I'm
> sure you know, I'm a studless beam advocate, but I'm also a studded beam
> advocate. For compact, lightweight structures, studless beams have an advantage
> over studded beams. For structures where you need to worry about static
> stresses and strains (which your arm has especially when fully extended),
> studded beams abnd plates are superior.
I'm convinced too now... but maybe someone has found (will find) a way to build
decent studless braced structures?
> Studless beams have much more flexion than studded beams. To overcome the
> flexion you need to use cross bracing.
I had not much trouble in one direction, but couln't find ways to properly
attach bracing in the orthogonal direction. So the structure was much too
flexible. Unfortunately I forgot to photograph the studless version before
dismantling it...
> Did the connections between the beams fail, or did the beams fail themselved?
> Or was it that the structure twisted?
Twisting was the main problem...
>
> The structure below shows your typical cross bracing arrangement. You will
> want cross bracing in all three dimensions.
I did cross bracing, but stud/hole connection is stiffer that hole/pin/hole (to
place beams end to end) and much stiffer than hole/pin/hole/pin/hole I had to
use for bracing in one direction :-(
That said, I find myself using more and more studless constructions - the arm
itself is mainly studless!
Philo
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Message has 1 Reply:
 | | Re: Pneumatic Arm
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| (...) <snip for bandwidth> (...) My answers to Technic Towers O' Power and Orthogonal Bracing: Method 1- Axles, Axle Connectors and Studless: 1 square segment = 4x Constructed as follows Verticals using Axle Connector #2 Alternating 90 degrees with (...) (20 years ago, 15-Dec-04, to lugnet.technic)
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Message is in Reply To:
| | Re: Pneumatic Arm
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| (...) Philo, Congratulations on a beautiful creation! I like it a lot. I appreciate all the thought that went into the design. I'm also envious of all your clear pneumatic hose ;^) Studless beams work well in some applications, and not well in (...) (20 years ago, 17-Jul-04, to lugnet.technic)
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