Alt-BEAM Archive

Message #10689



To: beam@sgiblab.sgi.com
From: BUDSCOTT@aol.com
Date: Tue, 22 Feb 2000 17:30:29 EST
Subject: [alt-beam] Re: MPJA geared motors


i'm usin a bicore, is that the same deal. how does the bicore detect and
respond to feedback?

-Spencer



10690 Tue, 22 Feb 2000 17:38:01 EST [alt-beam] Re: Ah! The Fallacies of BEAM......solar walker..... beam@sgiblab.sgi.com Bumper314@aol.com In a message dated 2/22/00 3:29:11 PM Mountain Standard Time,
dibst11+@pitt.edu writes:

> Here's one of the more interesting things about BEAM, the Solar Walker.
> Solar walkers are indeed something that is relatively easy to build, but in
> actuality, we can't build very competent solarwalkers.(although some people
> have!) The reason? When we try to emulate Mark T's bot's the place were we
> fall short is in out motors. Mark T has gearheads that cost hundreds EACH.
> One of his walkers would be worth over three hundred in motor-age alone.
> Regardless of how much we scavange around, it's going to be very hard for
> you to emulate the effeciencies possible from the motors that he uses to
> demo his bots.

Well occationally I come by a pair of escaps at surplus places, thats really
all his motors are correct? So just to clarify, a bot running of escaps
should be able to run off a micorecore without a motor driver, same with the
master slave bicore right?

Steve



10691 Tue, 22 Feb 2000 17:40:58 EST [alt-beam] Aquabots beam@sgiblab.sgi.com JVernonM@aol.com Hi all,
One important thing to remember is to put a small package of desiccant in the
electronics and motor housings. When you seal these things up, you trap a
small amount of air inside. When you place the bot into water that is cooler
than the air inside it causes the moisture to condense out of the air and
onto your electronics and motor. Over time this can lead to severe corrosion.
A small container or packet of desiccant will solve this problem.

See ya,
Jim
http://www.geocities.com/SoHo/Exhibit/8281/beamart.html
ICQ# 55657870



10692 Tue, 22 Feb 2000 17:42:27 EST [alt-beam] Re: Ah! The Fallacies of BEAM......solar walker..... beam@sgiblab.sgi.com BUDSCOTT@aol.com hundreds of dollars!!!!!!!!!! my goodness, and i thought i paid the price by
using motors that cost about 5 bucks! i kinda looked a building a solar
walker too, but the ease of NiCd batteries was way too tempting although
bulky! i'll stick to being a cheap skate! I believe that beam-online might
have a circuit for solar powering a walker, though it might be under
construction like the rest of the page. what might prove better is to upscale
the bot some, and use higher output larger solarcells, then you can use a
circuit that will trigger when it's dark or somthing and use NiCd's as
instead of a cap, that would be a big pain, but its a way of going about the
problem!

-Spencer



10693 Tue, 22 Feb 2000 17:45:48 EST [alt-beam] Dizzy Symet beam@sgiblab.sgi.com BUDSCOTT@aol.com i've got a little bitty symet (bout 1.5 x 1.5 x 1 in.) made with four fold
rotation symmetry. it's got four nice sides to skid on, but it seems to go in
really tight circles, i know that symets are kinda supposed to do that, but
is there a way to make the circles bigger than a 2 in. diameter? its nice not
having to worry about it falling of my desk, but it isn't very interesting to
watch if the circles stay this tight, the only thing that makes it travel
away from its circle is from intervention from me or other robots. any
suggestions?

-Spencer



10694 Tue, 22 Feb 2000 17:55:42 EST [alt-beam] Re: Dizzy Symet beam@sgiblab.sgi.com JVernonM@aol.com How do you have the bot set up? What is the motivator? And how big is it?
What does the bot lean on when not moving. Perhaps you could change the
geometry slightly to get more travel. Bumps or projections around the area
that contacts the surface of the table may help.

See ya,
Jim
http://www.geocities.com/SoHo/Exhibit/8281/beamart.html
ICQ# 55657870



10695 Tue, 22 Feb 2000 19:01:20 -0400 [alt-beam] Re: Dizzy Symet alt-beam@egroups.com michael.hirtle@ns.sympatico.ca (Michael Hirtle) We will have to know more about what the symet looks like, maybe a picture or
something because there is many ways to construct a symet

BUDSCOTT@aol.com wrote:

> i've got a little bitty symet (bout 1.5 x 1.5 x 1 in.) made with four fold
> rotation symmetry. it's got four nice sides to skid on, but it seems to go in
> really tight circles, i know that symets are kinda supposed to do that, but
> is there a way to make the circles bigger than a 2 in. diameter? its nice not
> having to worry about it falling of my desk, but it isn't very interesting to
> watch if the circles stay this tight, the only thing that makes it travel
> away from its circle is from intervention from me or other robots. any
> suggestions?
>
> -Spencer

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