Alt-BEAM Archive

Message #12179



To: beam@sgiblab.sgi.com
From: "Jason -" evenflow88@hotmail.com
Date: Mon, 20 Mar 2000 07:28:00 GMT
Subject: [alt-beam] Re: Some mini geared motors on eBay




>From: "Arthur J. Lekstutis"
>Reply-To: beam@sgiblab.sgi.com
>To: beam@sgiblab.sgi.com
>Subject: Some mini geared motors on eBay
>Date: Sun, 19 Mar 2000 19:49:10 -0500
>
>Sorry for the blatant capitalism, but thought some of you might find
>this useful...
>
>I'm currently selling an extra zoom telephoto lens I have on eBay (using
>the others for my own projects :-). Has two geared motors that might be
>useful to those building small robots. See the pictures on eBay if
>interested.
>
>http://cgi.ebay.com/aw-cgi/eBayISAPI.dll?ViewItem&item=287962792
>
>Later,
>Artie


Hie...........i would like to buy the two of your motors for USD18.....the
problem is i cant register in ebay so i might as well email u here........so
can u confirm to sell it to me..........i will send u a pay cheque when it
is ok..........
______________________________________________________



12180 Mon, 20 Mar 2000 00:35:26 PST [alt-beam] Re: Aesthetics beam@sgiblab.sgi.com "Timothy Flytch" Ya know Randy,
This has been a dream of mine ever since I red the book battlefield earth
by L. Ron
Hubbard(http://www.amazon.com/exec/obidos/ASIN/0884046818/o/qid=953541048/sr=2-1/002-4712281-1624218)almost
20 years ago... in the story the bad guy uses a pen like device to change
cardboard into circuits just by drawing them out... so far I have yet to
find a medium that fits this... But I will not let go... LOL... the closest
I have seen is using copper tape on paper... Pitsco sells kits... you can
get their catalog at

http://www.pitsco.com/

I must warn you though their catalog is not kind if you have no $$$
I have a long wish list for them... And I have had very good experience with
the orders I have got , so they are good to deal with :)

Timothy...

>Hi, i'm been on BEAM for half a year now, and i have a
>suggestion:
>Just wunderin',
>What if we put our PCB's on transparencies?
>(you know, transparent plastic)
>Print PCb's out, photostat em' onto trans, and since
>carbon conducts electricity, pathways can be made.
>components can be stuck by whatever means, like
>conducting epoxy, or sticking another piece of plastic
>onto the connections and melting em' , i.e. laminatin'
>em'.
>Would look nice if wrapped around caps, or motors :)
>any comments? (or criticisms?) :)
>
>__________________________________________________
>Do You Yahoo!?
>Talk to your friends online with Yahoo! Messenger.
>http://im.yahoo.com

______________________________________________________



12181 Mon, 20 Mar 2000 00:58:27 PST [alt-beam] Re: Funky idea... beam@sgiblab.sgi.com "Timothy Flytch" Oil filled motors... works ok for brushless DC motors but kinda interferes
with the brush-commentator connection on regular motors...

Timothy...

>Hey people,
> Just got a strange idea. I was talking to a fried of mine about
>overclocking and he said some fanatics immerse their computers in super
>cooled mineral oil, because it has infinite resistance. I was also thinking
>about aquabots. So, couldn't you just fill the bot with mineral oil and it
>would have equilibrium, and the water wouldn't fuse into it (if mineral oil
>is like any other kind of oil), and the parts wouldn't short. Just a
>thought.
>-William
>
>
>____________________________
>http://robot-central.webjump.com/
>Robotics books, projects, resources,
>links, news, and more!
>

______________________________________________________



12182 Mon, 20 Mar 2000 22:48:50 +1100 [alt-beam] Question about vibra-popper mechanics beam "Ben Hitchcock"
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All,

I have been working on a 'crunch-resistant' robot for about a month, off and
on. I finally got the circuit working to my satisfaction, but the damn
mechanics are driving me crazy!

I decided to make the whole robot as flat as possible. My reasoning being
that the wider and flatter the bot, the larger the surface area so less
pressure would be exerted on it. When an errant foot finds this bot then
chances are it will be able to survive long enough for the person doing the
crunching to notice that a little robot is beneath his foot! At the moment
the height is a squat 10 mm. For propulsion, I used two pager motors,
mounted parallel to the ground with the weights attached. The bot sits on
the motor mounts, and the 1F capacitor.

I thought that the vibration from the motors would make the robot 'wiggle'
in the same direction as the weights, but 180 degrees out of phase (the
whole center of mass concept). This would make the bot alternatively hit
the ground going backwards, and hop up while going forwards. The ground
would provide a push forwards (opposing the backward motion) so that side of
the bot would be pushed forwards. A photopopper without motor shafts
touching the ground!

Here is what I found:
No matter which direction I make the motors spin, the bot gets pushed
backwards when a motor fires. This makes the robot do strange pirouettes
while alternately light seeking and light avoiding. Crazy stuff! The
electronics work fine, it's just the mechanics that are off. I have
attached a picture to show what I mean.

After a bit of experimentation I made two little stumpy 'legs' of solder,
attached to the motor mounts. These rest on the ground to grip the table.
These made almost no difference. Adding heatshrink boots to the legs just
made the robot walk at 45 degrees rather than straight.

Has anyone ever attempted such a robot? I know that there have been spiders
and legged vibra-bots but has anyone ever tried the 'flat out' approach? If
I get it working I hope to encase the lot in silicone rubber: a waterproof,
shockproof, no external moving parts robot! The electronics are already
showing some interesting behaviour: it will sit in the sunlight soaking up
the sun, and move when the voltage reaches the threshold. But pick it up
and put it in a pocket and it will sit there struggling to get free for a
good 20 seconds! But once again the mechanics fail me.

Any ideas?

Thanks,
Ben



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Attachment: popper.jpg

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12183 Mon, 20 Mar 2000 04:04:13 -0800 [alt-beam] Re: SnakeBot Parts PACK "beam@sgiblab.sgi.com" "iphotope@botic.com" >So, how come you incredible package is $300, and Solarbotics walker
is ALSO
>$300. Which one would YOU want???
>-William

Honestly, the snake pack. It is something that you don't
see everyday. It also comes with six (?) gearmotors
compared to solarbotics' 2. I think the parts in the snake
pack would be worth more.
Just a thought.
Iphotope



12184 Sun, 19 Mar 2000 19:05:44 -0500 RE: SnakeBot Parts PACK Dennison Bertram
> Heh heh. Because Solarbotics walker is a Kit. This isn't a kit. It does
have
> some documentation, but mostly what you build, and how you build it is a
> product of your own creativity.
>
> dennison
>
>
> So, how come you incredible package is $300, and Solarbotics walker is
ALSO
> $300. Which one would YOU want???
> -William
>
> ----- Original Message -----
> From: Dennison Bertram
> To:
> Sent: Sunday, March 19, 2000 5:43 AM
> Subject: SnakeBot Parts PACK
>
>
> > Every now and then I get inspiration and offer up part packs for the
more
> > ambitious beamers out there. Remeber seeing Mark Tildens Lamprey bot?
The
> > one that slithers? (Check it out at Solarbotics robot gallery under
> turbots,
> > or misc) Well, once again, (I made this offer once before) I'm offering
a
> > SNAKEBOT PARTS PACK, there will be only ONE of these made. (I don't
really
> > expect many offers for it.) It will have EIGHT highquality Gearmotors.
THE
> > EXACT SAME GEARMOTORS THAT MARK T USES ON HIS SNAKEBOT. Yep. That's
right,
> > I'm talking the Omron Mac Disk Eject Motors. All tested and working
fine.
> > This will inlcude nearly everything you need to get started. working on
> your
> > SnakeBOT. PCB's for the Bicores, and nearly all the electrical
components
> > you would need, photodiodes, chips, transitors, etc... In addition, I
> > include the big things you'll need. Epoxy, Rechargable Battery Packs, a
> > wallwart and connecter to charge the batteries. Swtiches, hardware,
Etc...
> > Effectively it's a huge BEAM Party in a box! (Ok, so thats a little
> corney,
> > but it's a good description!) Anyway, I love selling these things. The
> price
> > is a little high, ~$300 But it would be well worth it! If anyones
> > interseted, drop me a line! questions comments are welcome and
encouraged!
> >
> > dennison
> >
> >
> >
>
>


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