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In lugnet.org.ca.rtltoronto, Ross Crawford wrote:
> In lugnet.org.ca.rtltoronto, Chris Magno wrote:
> > Brian Davis wrote:
> > >
> > > Thank you! That's actually nice photodocumentation, and I'll try to put one
> > > together based on that. I wonder if for larger structures you might need to go
> > > to beams for some of the connections that are under tension during parts of the
> > > cycle.
> >
> >
> > I think you need to make one leg - you will be shocked at how well it
> > preforms. The short answer is no - no need for beams in this leg design.
> > just the beauty of parallel linkages.
> >
> > check out philo's gif of the leg motion (the "oval) at the bottom
> >
> > http://www.philohome.com/theo/tj.gif
> >
> > the leg is only "taking weight" when the foot is on the ground, and
> > then, thats when the "back" of the leg is more or less in a line. All
> > the weight is transfered along the length of the axles "vertically" to
> > the one point where the entire leg is attached to the frame.
>
> You might find that the beams that pull the leg sideways are under enough
> tension with a large version to cause problems though, especially if moving over
> difficult terrain.
(Bright blue or bright green in that image depending on direction of travel)
ROSCO
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Ross Crawford wrote:
> > >
> > > check out philo's gif of the leg motion (the "oval) at the bottom
> > >
> > > http://www.philohome.com/theo/tj.gif
> > >
> > > the leg is only "taking weight" when the foot is on the ground, and
> > > then, thats when the "back" of the leg is more or less in a line. All
> > > the weight is transfered along the length of the axles "vertically" to
> > > the one point where the entire leg is attached to the frame.
> > You might find that the beams that pull the leg sideways are under enough
> > tension with a large version to cause problems though, especially if moving over
> > difficult terrain.
>
> (Bright blue or bright green in that image depending on direction of travel)
>
> ROSCO
hummmmm, maybe Im not understanding. as I see it, all the "weight" is
at the one pivot point in the leg that attaches to the "frame." (the
thick black line in Philo's Gif.)
Chris
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In lugnet.org.ca.rtltoronto, Chris Magno wrote:
> Ross Crawford wrote:
>
> > > >
> > > > check out philo's gif of the leg motion (the "oval) at the bottom
> > > >
> > > > http://www.philohome.com/theo/tj.gif
> > > >
> > > > the leg is only "taking weight" when the foot is on the ground, and
> > > > then, thats when the "back" of the leg is more or less in a line. All
> > > > the weight is transfered along the length of the axles "vertically" to
> > > > the one point where the entire leg is attached to the frame.
> > > You might find that the beams that pull the leg sideways are under enough
> > > tension with a large version to cause problems though, especially if moving over
> > > difficult terrain.
> >
> > (Bright blue or bright green in that image depending on direction of travel)
> >
> > ROSCO
>
>
> hummmmm, maybe Im not understanding. as I see it, all the "weight" is
> at the one pivot point in the leg that attaches to the "frame." (the
> thick black line in Philo's Gif.)
But weight is not the only force happening - something has to move it laterally.
When the leg is pulled sideways the link doing the pulling is in tension, the
heavier the bot is, the more tension there will be.
ROSCO
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