Alt-BEAM Archive

Message #11118



To: beam@sgiblab.sgi.com
From: Richard Piotter richfile@rconnect.com
Date: Tue, 29 Feb 2000 15:15:39 -0600
Subject: [alt-beam] Re: Diskette Drives/camera parts


Those oh so great motors are the rectangle motors that are used in some
slot cars, model trains, and other small toys. I'm not certain if they
are different internaly, or how efficient they are. I've taken apart a
couple of those disc cameras.

Timothy Flytch wrote:
>
> Has anyone used the motors from disc cameras... I remember a few years ago
> when kodak first introduced these cameras there was a lot of write up about
> the motors revolutionary size/efficiency... it is this ancient history???
>
> Timothy...
> ______________________________________________________
>


11119 Tue, 29 Feb 2000 16:32:58 EST [alt-beam] Re: BEAMAnt circuit beam@sgiblab.sgi.com JVernonM@aol.com In a message dated 2/29/00 2:03:34 PM Eastern Standard Time,
phillip@ryals.com writes:

> Remember the thread about a photovore that can turn on both motors at once?
> I got the impression from some of the posts that the BEAMAnt cicuit does
> that. I've put it together though, and it runs one motor at a time. Is
> this right?
Yes, but the effect is only noticeable in lower light conditions. In medium
to low light the bot exhibits a cute waggling motion. The darker the
conditions, the more pronounced the waggle. As the light gets brighter,
pulses are sent to the motors faster, causing the bot to appear to go into
continuous movement on both sides. It's really still firing one at a time,
but so quickly that it looks like continuous fluid movement.

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



11120 Tue, 29 Feb 2000 15:37:19 -0600 [alt-beam] Re: mini walker beam@sgiblab.sgi.com Richard Piotter As mentioned earlier, the distance the magnet travels is 1/4 inch.

Would it be wiser to use a pair of coils, one on either side of the
magnet? If so, what'd be the recomended wiring, series or parallel.


Sathe Dilip wrote:
>
> Richard Piotter wrote:
> >
> SNIP
> > Also, if I have an iron core for the electromagnet and the magnet on the
> > leg sticks to teh core, will reversing the polarity of the electromagnet
> > make it release the iron core, or will the magnetic bond between the
> > magnet and core be too much. if that's so, I could run the coils off
>
> It will be pushed away. My concern is, how much of a movement between
> the magnet & the electromagnet do you need? The magnetic force between
> two magnet poles (whether attracting or repelling) is inversely
> proportional to the square of the distance between the two poles. So
> the farther you go, weaker will be the attraction or repulsion. When
> the leg is at the extreme end of its travel, if the distance between the
> poles is too much, you will not be able to pull them back together.
> Second concern is that the overall motion will be too jerky.
>
> Dilip
> -----------------------------
> ----------------------------------------------------------------------
> The early bird may get the worm, but the second mouse gets the cheese.
> ----------------------------------------------------------------------

--


Richard Piotter The Richfiles Robotics & TI web page:
richfile@rconnect.com http://richfiles.calc.org

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11121 Tue, 29 Feb 2000 13:50:56 -0800 [alt-beam] Re: mini walker beam@sgiblab.sgi.com Bruce Robinson Sathe Dilip wrote:
>
> ... Second concern is that the overall motion will be too jerky.

What, a 2-motor bicore isn't jerky??

:)

Bruce



11122 Tue, 29 Feb 2000 13:50:57 -0800 (PST) [alt-beam] solaroller throttle??? beam@sgiblab.sgi.com Evan Dudzik I have a question... would this work? Here is my
idea... replace the resistor in a standard solarengine
with a capacitor... this way when it fired it would
have a lot of torque as the resistance would be low,
and as the cap charged and the resistance increased,
less current would reach the motor, spreading out the
power... this (if it worked) should make the thing
blast off the line, and spread out the remaining power
over a long stretch, where it just has to keep its
momentum, which doesn't require much power... I am
going to put in a sort of clutch or something so when
the motor stops, it moves away so the wheel can still
coast... I am going to try and make a REALLY nice
solaroller. I already have a very aesthetic and
futuristic body shell for it, and I am probably going
to purchase a relatively nice little motor (a more
efficient pager motor type motor) and use some
expensive bearinged wheels or something... If this
won't work, could someone tell me another way of
spreading out the power? WILF, got a circuit???
well, thanks!

=====
+------------------------+
|http://surf.to/photovore|
|Photovores online! |
|Evandude Dudzik |
+------------------------+
__________________________________________________
Do You Yahoo!?
Talk to your friends online with Yahoo! Messenger.
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11123 Tue, 29 Feb 2000 16:44:11 EST [alt-beam] Re: BEAMAnt circuit beam@sgiblab.sgi.com JVernonM@aol.com In a message dated 2/29/00 2:54:07 PM Eastern Standard Time,
beamtastic@yahoo.com writes:

> he beamant circuit turns both motors when one of the
> touch sensors is tripped. then its' both on, both off,
> both on, both off.
Yep, forgot about that. Both motors do turn when a tactile sensor is tripped,
only one of them reverses causing the bot to pivot.

> By lowering the the values of the resistors on the
> beamant circuit (on the Mcore), you can make it appear
> that the motors are both turning at the same time, but
> in reality are pulsing quickly.. I believe this also
> uses more current than one that pulses slower.. but I
> could be wrong.
It can do this on it's own. Seems to me the solar version of the bot is best
when tuned to run continuously in bright light where it has the most power,
and to slow down in less light to conserve power. You can go to far with this
however, and the bot will go to far one way or the other. Running the pulses
to quickly in bright light burns up the juice and actually slows the bot
somewhat because the pulses are so rapid. Slowing it down to much in lower
light can make the bot non functional at light levels that it could still
operate on. All in all, a fascinating little circuit. The bot can be tuned to
not only find food, but to also change it's behavior in according to the
abundance of food supply. And all on a single 240 chip. You just gotta love
that!

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



11124 Wed, 1 Mar 2000 09:05:16 +1100 Lockin up "Beam List" "Senior"
> Hey everyone
> I've breadboarded stupid SE's many times, I've made many, never had any
> problems untill now! I'm trying to make a symet, and the darn thing just
> buzzes, the most common sympton of the famous 'lock up'. I've replaced
> the standard 2.2k resistor with 1.1k, still the same. I'm using a nromal
> cassete motor from mabuchi - 15ma draw..., and an array of 8 capacitors
> totaling 5700 uF. Is the resistor too small now?
>
> Thanks,
> Kyle

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