Alt-BEAM Archive

Message #11115



To: beam@sgiblab.sgi.com
From: "Sathe Dilip" sathe_dilip@bah.com
Date: Tue, 29 Feb 2000 15:49:58 -0500
Subject: [alt-beam] Re: mini walker




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
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The early bird may get the worm, but the second mouse gets the cheese.
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11116 Tue, 29 Feb 2000 15:56:08 -0500 [alt-beam] Re: shack caps beam@sgiblab.sgi.com "Sathe Dilip" No, the chips are safe in that respect. These packages (black
plastic/ceramic) are referred to as hermetically sealed packages and are
impervious to moisture & ordinary gases.

Dilip
------------------------------------

Rob wrote:
>
> Sathe Dilip wrote:
>
> > I can think of a few things (electronic) that can go bad with
> > time/storage.
>
> Does the black plastic chips are made of soak up moisture? On the bag that
> the chips came in there were detailed limits for handling. I know the legs
> of semiconductors oxidise and that some assembly is done in nitrogen to
> eliminate the oxygen. Does any of this affect us?
>
> Rob

--
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The early bird may get the worm, but the second mouse gets the cheese.
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11117 Tue, 29 Feb 2000 13:00:11 -0800 [alt-beam] Re: Hey! What's this thingy? "Dennison Bertram"
content-transfer-encoding: 7bit


um, thats a negatory on that one. Whatever your trying to do though,
probably isn't worth it. Chips like that are so specialized if anything its
a small microprocessor which is already permanatly programed for a specific
task. If your really interested in vision look at some other ideas, like the
earlier thread between me and wilf about using video cameras in BEAM.

dennison
I took this chip out of an old feed-through scanner that I had laying
around. I can't find a datasheet at NEC for it. This is what it looks like
on the bottom of the chip.

NEC Japan

D3734CY-1
9528KD011

Any of you old-timers out have a heads up on this? I'd like to use it as
a form of vision.

Richard


content-transfer-encoding: quoted-printable



>

I took this chip out of an old feed-through scanner t=
hat I =

had laying around.  I can't find a datasheet at NEC for it.  Th=
is is =

what it looks like on the bottom of the chip.

 

NEC Japan

 

D3734CY-1

9528KD011

 

Any of you old-timers out have a heads up on this?&nb=
sp; I'd =

like to use it as a form of vision.

 

Richard




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