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 19:48:56 GMT
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Viewed:
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690 times
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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/
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Message has 2 Replies:
 | | Re: Fresh New Robots
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| "Rob Stehlik" <robbby31@hotmail.com> wrote in message news:H1voDK.2DD@lugnet.com... (...) your (...) the (...) linkage. (...) keep (...) the (...) still (...) two (...) crevasse (...) definitely fooled me. I always enjoy your innovative designs. (...) (22 years ago, 3-Sep-02, to lugnet.robotics)
| | | Re: Fresh New Robots
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| (...) I had the pleasure of watching Rob's robot make several attempts (including some tuning runs) Despite the fact that the robot may have worked the worst (of the three entries) I think it was just a couple tweeks away from being the best. Ok, so (...) (22 years ago, 3-Sep-02, to lugnet.robotics)
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Message is in Reply To:
| | Re: Fresh New Robots
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| "Rob Stehlik" <robbby31@hotmail.com> wrote in message news:H1s1rp.But@lugnet.com... (...) more. (...) 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 (...) (22 years ago, 2-Sep-02, to lugnet.robotics)
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