Subject:
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Tri-star wheels [was: Re: [Woefully off topic] Feel the .sig Luke...]
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Newsgroups:
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lugnet.robotics
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Date:
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Fri, 3 Mar 2000 03:53:36 GMT
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825 times
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in article 85256896.00771B64.00@aamta02.avid.com, lego-robotics@crynwr.com
at lego-robotics@crynwr.com wrote on 3/2/00 1:38 PM:
>
> I'm thinking about how to design a machine that can climb real-live household
> stairs - as
> well as move about flat surfaces. I've seen designs for robots that can climb
> obstacles, but
> not as big as a step. I'm thinking of something along the lines of a six
> wheeled
> robot.
> Two Y shaped ferris wheel thingys with a wheel at the end of each spoke (two
> wheels in
> contact with the ground at any one time). When the robot detects a stair or
> obstacle, it
> could shift its weight and rotate the Y forward. Has anyone seen anything like
> this ?
>
> Critically, I think the centre of gravity must be higher than the step for
> this
> to work.
>
> bad ascii art:
>
> 1 O 2 O 3 O
> | \ |
> O ___ O--O O
> / \ | | ___ / \
> O O| O| O O
> robot obstacle -------
>
> -Simon
>
>
Actually, that's a very nice piece of ascii art describing something called
the tri-star wheel. I saw my first example of this on a vehicle from a
cheesy movie called "Damnation Alley", adapted from a story by Roger
Zelazny. The vehicle was real (except for the missile launcher :). It
steered by bending in the middle, and at one point was seen crossing a lake
- the tri-star wheels acted like paddlewheels.
I've been interested in building one for some time but have never actually
sat down and tried it yet. My current robot project has four-wheel drive
and steers by bending in the middle, so if I just stick tri-star wheels on
it....
I also recall seeing a baby stroller with tri-star wheels. You could just
roll it right over curbs and the like.
There were a couple of web sites that discussed creating tri-star wheels
using Lego, but they both seem to be gone and I can't find where they might
have gone. Wait... there's one of them!
http://www.visi.com/~dc/
Hope this helps,
Doug
--
Doug Weathers, http://www.rdrop.com/~dougw
Portland, Oregon, USA
Don't spam me - I know how to use http://www.spamcop.net
"On a clear disk you can seek forever"
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Message has 1 Reply:
Message is in Reply To:
 | | [Woefully off topic] Feel the .sig Luke...
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| (Not a flame, troll or even a complaint !) (...) Perhaps I am showing my age, but I remember a time whe there was a usenet 'rule' that you should never make a post where the content is shorter than your .sig ;-). There was another 'rule' that let (...) (25 years ago, 2-Mar-00, to lugnet.robotics)
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