Subject:
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Re: Fresh New Robots
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Newsgroups:
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lugnet.robotics
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Date:
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Tue, 3 Sep 2002 20:24:05 GMT
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Viewed:
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671 times
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"Rob Stehlik" <robbby31@hotmail.com> wrote in message
news:H1voDK.2DD@lugnet.com...
> In lugnet.robotics, Robert Fay writes:
> >
> > "Rob Stehlik" <robbby31@hotmail.com> wrote in message
> > news:H1s1rp.But@lugnet.com...
> > > Hello everyone,
> > >
> > > I have just added five new robots to my website. This includes bridge
> > > building robots, another turtle robot, an articulated steering 4x4, and • more.
> > > http://www.ecf.utoronto.ca/~stehlik/robots.html
> > > Have a look, and as always comments are welcome!
> > >
> > > Rob
> >
> > This is some very interesting work. The Crevasse Crosser interests me the
> > most. I was trying to guess what you would do to accomplish this task. I
> > envisioned a ball rolling across a concave trough. Your solution is very
> > clever. I am not sure I understand the mechanism to recapture the bridge.
> > You are doing some great work with the pneumatics. Thanks for sharing • your
> > work and your excellent presentation.
>
>
> Hello Bob,
> I'm glad the crevasse crosser has piqued your interest. I find it kind of
> surprising that the robot that worked the absolute worst seemed to draw • the
> most attention. Maybe its the pneumatics that people are interested in. I
> used them because they are much stronger than motors. When lifting the
> bridge, the robot needed a lot of force to raise its forks. So let me try
> and explain how it works... The bridge is a run of the mill scissor • linkage.
> Nothing too special there. It has two projecting beams on the bottom to • keep
> it centered in the gap. With its forks lowered, the robot drives forward,
> and the furthest link on the bridge (the end) slides over the forks. As • the
> robot raises the forks, the tendency would be fork the bridge just to slip
> off. But there is a beam on the robot that catches the end link on the
> bridge, and forces the linkage to retract as it is lifted. Maybe thats • still
> not clear enough... Let me try and explain it a different way. There are • two
> links at the end of the bridge. The robot lifts one of them with the forks
> (actually a rotary motion) which the other link is forced to move up in a
> straight line by means of the overhanging beam on the robot. When one link
> rotates and the other doesn't, this causes the linkage to retract. I hope
> that makes more sense. If only I had a video camera... Oh well, the • crevasse
> crosser has since been disassembled and sorted.
> Rob
>
> http://www.ecf.utoronto.ca/~stehlik/
Rob,
Thanks for the additional information. The rotary motion of the forks
definitely fooled me. I always enjoy your innovative designs. You packed a
lot of action into a very small space. Some day you will be able to design
the parts to suit the project. I bet you will dazzle a few minds then.
Bob
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Message is in Reply To:
 | | Re: Fresh New Robots
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| (...) Hello Bob, I'm glad the crevasse crosser has piqued your interest. I find it kind of surprising that the robot that worked the absolute worst seemed to draw the most attention. Maybe its the pneumatics that people are interested in. I used (...) (22 years ago, 3-Sep-02, to lugnet.robotics)
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