Alt-BEAM Archive

Message #11202



To: beam@sgiblab.sgi.com
From: Bruce Robinson Bruce_Robinson@telus.net
Date: Wed, 01 Mar 2000 10:10:56 -0800
Subject: [alt-beam] Re: mini walker


Hi, Richard. A thought or two ...

> ... The newer design will work better. 2 coils, magnets on either side.
> small iron core for retention of the legs. one magnet always is in
> contact with the coil. that means that even a small kick can get the leg
> moving and then the other magnet is attracted and latches...

This is the configuration I thought would work well -- you beat me to
it. Have you given any thought about how to mount/attach your magnets?

Here's a couple of ideas.

1) Rare earth magnets with holes in the centre. Attach with a small
screw, or perhaps attach the two magnets together on a (non-ferrous)
rod and have a hole in the center of your coil for the rod to pass
through.
2) Use a small steel cup to hold the magnet. This increases concentrates
the magnet field (by a factor of 4 or so), AND you can just stick
the magnet in the cup.

So, you ask, how do you get a magent with a hole in it? Where would you
get a small steel cup? Lee Valley tools has a nice selection of
rare-earth magnets, including ring shaped ones. At the small end of the
scale:

- 1/4" OD, 1/16" ID, 1/8" thick, nickle plated ... $0.45 CDN each.
- 3/8" OD, 1/8" ID, 1/8" thick, -----"------- .... $0.60 CDN each.

And they have steel cups as well, for both 1/4" & 3/8" magnets. Prices
similar to above.

Let me know if you want more information on these.

A final thought. Dilip mentioned the jerky motion ... well, the downside
of this configuration is when those magnets start bashing into the ends
of the coil. If you use rare-earth magnets, you'll find they are pretty
brittle. There's also a good chance you'll shake your 'bot apart. You
can probably do a lot to relieve this condition by putting a couple of
very thin, resiliant pads at each end of your coil. Perhaps just a
couple of layers of 6 mil polyethylene would do the trick.

Let us know how this one works out (as if you'd keep it to yourself :)

Regards,
Bruce



11203 Wed, 1 Mar 2000 14:50:22 EST [alt-beam] Re: Radio shack solar panels beam@sgiblab.sgi.com Toby503@aol.com How about splitting the solar cell with an Xacto knife? I never tried it
myself.

Rusty



11204 Wed, 01 Mar 2000 13:45:22 -0600 [alt-beam] Re: mini walker beam@sgiblab.sgi.com Richard Piotter I planned on having an iron core (small) within the coil. The magnets
are on guitar wire that forms a friction/magnetic fit. I was more woried
about the coil's enamel being worn down, so I had intended on using thin
plastic to protect the coil. If it's all the way over the hole, then it
ought to provide a slight cusioning effect. It's pretty small, so i'm
going to simply see how it runs. If all runs well, I'll be happy.

Didn't take long to figure out that schematic. Very nice!

I can't wait to buy all my parts! I'm not even sure if I'll use
batteries! I might.. Depends how well it runs, and in what light levels.


Bruce Robinson wrote:
>
> Hi, Richard. A thought or two ...
>
> > ... The newer design will work better. 2 coils, magnets on either side.
> > small iron core for retention of the legs. one magnet always is in
> > contact with the coil. that means that even a small kick can get the leg
> > moving and then the other magnet is attracted and latches...
>
> This is the configuration I thought would work well -- you beat me to
> it. Have you given any thought about how to mount/attach your magnets?
>
> Here's a couple of ideas.
>
> 1) Rare earth magnets with holes in the centre. Attach with a small
> screw, or perhaps attach the two magnets together on a (non-ferrous)
> rod and have a hole in the center of your coil for the rod to pass
> through.
> 2) Use a small steel cup to hold the magnet. This increases concentrates
> the magnet field (by a factor of 4 or so), AND you can just stick
> the magnet in the cup.
>
> So, you ask, how do you get a magent with a hole in it? Where would you
> get a small steel cup? Lee Valley tools has a nice selection of
> rare-earth magnets, including ring shaped ones. At the small end of the
> scale:
>
> - 1/4" OD, 1/16" ID, 1/8" thick, nickle plated ... $0.45 CDN each.
> - 3/8" OD, 1/8" ID, 1/8" thick, -----"------- .... $0.60 CDN each.
>
> And they have steel cups as well, for both 1/4" & 3/8" magnets. Prices
> similar to above.
>
> Let me know if you want more information on these.
>
> A final thought. Dilip mentioned the jerky motion ... well, the downside
> of this configuration is when those magnets start bashing into the ends
> of the coil. If you use rare-earth magnets, you'll find they are pretty
> brittle. There's also a good chance you'll shake your 'bot apart. You
> can probably do a lot to relieve this condition by putting a couple of
> very thin, resiliant pads at each end of your coil. Perhaps just a
> couple of layers of 6 mil polyethylene would do the trick.
>
> Let us know how this one works out (as if you'd keep it to yourself :)
>
> Regards,
> Bruce

--


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

-- Make Money by Simply Surfing the Net or responding to E-Mail!!!
-- Click below!!!

http://www.alladvantage.com/go.asp?refid=ATL147
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11205 Wed, 01 Mar 2000 20:19:03 GMT [alt-beam] Re: Ah! The Fallacies of BEAM......solar walker..... beam@sgiblab.sgi.com "ReidScott ReidScott"


>
>Well occationally I come by a pair of escaps at surplus places, thats
>really
what are escaps whare can i buy, what suplus and whare can i see how they
work and are used. also what is the best site to see tilsens stuff

>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

______________________________________________________



11206 Wed, 01 Mar 2000 12:29:17 PST [alt-beam] Fw: WARNING hacker are everywere... beam@sgiblab.sgi.com, freenrg-l@eskimo.com "Timothy Flytch" I got this today... and thought with the resent hackings this was pertinent
to send on...
I hope you will quickly read it before deleting...

Timothy...


>>From: "Karen Lyster"
>>Reply-To: "UFO Scotland"
>>To: "2reality" <2reality@fpnet.co.nz>
>>Subject: [UFOscotland] Fw: WARNING To all Computer Owners & Publishing
>>Businesses
>>Date: Wed, 3 Nov 1999 18:53:45 +1300
>>
>>UFO Scotland - http://wkweb5.cableinet.co.uk/dledger
>>
>>WARNING To all Computer Owners & Publishing Businesses
>>----- Original Message -----
>>From: The Keith Basterfield Network Australasia
>>To: Aussiepost@listbot.com ; ;Abduction
>>Sent: Wednesday, March 01, 2000 5:15 PM
>>Subject: WARNING To all Computer Owners & Publishing Businesses
>>
>>
>>The Keith Basterfield Network Australasia -
>>http://www.powerup.com.au/~tkbnetw/new
>>
>>WARNING To all Computer Owners & Publishing Businesses
>>THIS COULD HAPPEN TO YOU
>>
>>
>>We never thought it would happen to our
>>Mac G3 Computers
>>But it did
>>
>>
>> !We got hacked! and it could happen to you, we lost all our Magazine
>>info and all our UFO data off 2 ...Separate Computers Systems ... Each
>>computer was hooked up to 2 separate phone lines... Data was kept on both
>>computers on alternative drives "for protection ha!!! "WRONG"
>>
>>
>> If you have a Any type of computer and you think your safe from hackers
>>!think again! Your not.
>>
>>
>> We lost 4 years of publishing work in 20 minutes !GONE NOTHING LEFT!
>>Robert lost the only typed copy of his UFO book which he had been
>>working on for the past 15 years. It was gone in 15 minutes and there was
>>!Nothing! We could do to stop or save a thing.
>>
>>
>> My (Main Drive) disappeared from the my desk top and had to be re-
>>configured... So it was able to be re-read but when recovered there was
>>not a Meg of data left on either of my 2 x 6 Meg drives.
>>
>>
>> The same happened to Robert (Second Drive) !Nothing Was Recovered!
>>from his 2 x 6 Meg drives. Years of work gone in 20 minutes
>>
>>
>> If your in the publishing business.. the I only advise I can give you
>>is to unplug your computer from any phone connection when your not on the
>>net. Think about it "WE Recovered Nothing" years of work !GONE even
>>being off line is NO protection the only protection is being disconnected.
>>This is the only safe way to stop these guys.
>>
>>
>> We at Earthlink Publishing have now taken steps so this never happens
>>again. I would recommend if you have taken the time to read this e-mail
>>you act know. Never leave your system plugged in it could cost you your
>>Business.
>>
>>
>> Due to being hacked The Australasian UFOlogist Magazine & Exposure
>>Magazine is running a little behind.
>>
>>
>> To the Hacker "thanks for the lesson" !But you failed!. I had the
>>foresight to do a backup text copy of both Magazines I may have had to do
>>many hours of formating text and re- doing all the layout again but we are
>>of the printers in the morning :>)
>>
>>
>> To all subscribers we at Earthlink Publishing are so sorry for the
>>inconvenience and the magazines will be in the mail soon after.
>>
>>
>>
>>
>>
>>--------------------------------------------------------------------------------
>>To unsubscribe, write to Aussiepost-unsubscribe@listbot.com
>>______________________________________________________________________
>>Advertisement:
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>>
>>
>>
>>______________________________________________________________________
>>To unsubscribe, write to UFOscotland-unsubscribe@listbot.com
>>______________________________________________________________________
>>Advertisement:
>>Enter to win $1000 at winfreestuff.com!
>>What else do you want to win? If you want cash, gourmet foods, palm
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>

______________________________________________________



11207 Wed, 01 Mar 2000 15:35:39 -0500 [alt-beam] Re: mini walker beam@sgiblab.sgi.com "Sathe Dilip"

Bruce Robinson wrote:
>
SNIP
> screw, or perhaps attach the two magnets together on a (non-ferrous)
> rod and have a hole in the center of your coil for the rod to pass
> through.

I like this idea but you still need a little piece of soft iron
somewhere to provide the Passive sticking of (now) magnetized rod.
Second issue is, depending on where you hinge the leg, the rod will have
to follow a curved path & will have to be curved.

> 2) Use a small steel cup to hold the magnet. This increases concentrates
> the magnet field (by a factor of 4 or so), AND you can just stick
> the magnet in the cup.
SNIP

This could be a problem. I think you are referring to creating a horse
shoe kind of magnet (only in a cup-pole shape). The steel cup providing
a return path for the magnetic lines of force from the other pole of the
magnet & bringing it to the same side as the coil facing pole. This
does provide an increased pull strength if you are only trying to say
pull a piece of soft iron. However when we are trying to use both the
pulling & repelling force of an electro-magnet, you end up with a
conflict. One pole will be attracted (say the inner pole) while the
other (rim of the cup) will be repelled. Kind of defeats the purpose
here.

May be I should add a simple graphic to show what I am referring to.

Before adding the cup:

-------------
| N S |
-------------

After adding the cup:

-----------------
| N |
| -------------
| |
| |-------------
| | S |
| |-------------
| |
| -------------
| N |
-----------------

Hope this makes it clear.

Dilip
----------------------------------------------------------------------
The early bird may get the worm, but the second mouse gets the cheese.
----------------------------------------------------------------------



11208 Wed, 01 Mar 2000 15:42:55 -0500 [alt-beam] Re: Radio shack solar panels beam@sgiblab.sgi.com "Sathe Dilip" The tool to use is a diamond tip scriber or a glass cutter. I did some
trials with a glass cutter on some round silicon wafers but could not
get consistent results. May be if you know someone who does stained
glass work, they can teach you the correct technique.

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

Toby503@aol.com wrote:
>
> How about splitting the solar cell with an Xacto knife? I never tried it
> myself.
>
> Rusty

--
----------------------------------------------------------------------
The early bird may get the worm, but the second mouse gets the cheese.
----------------------------------------------------------------------



11209 Wed, 01 Mar 2000 13:46:14 -0700 [alt-beam] FRED schematic beam@sgiblab.sgi.com Robert Stein Could someone please post the location of the most current FRED
schematic. Thanks!

Robert

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