Alt-BEAM Archive
Message #10102
To: beam@sgiblab.sgi.com
From: Blumojo13@aol.com
Date: Fri, 11 Feb 2000 21:04:31 EST
Subject: [alt-beam] Re: Robot Movie
In a message dated 2/9/2000 9:11:38 AM Pacific Standard Time,
dibst11+@pitt.edu writes:
> http://www.pitt.edu/~dibst11/longbotmovie.mpg
the bot looks like a waterstrider. fast too.cool
blumojo13
10103 Fri, 11 Feb 2000 21:14:44 EST [alt-beam] Re: Robot Movie beam@sgiblab.sgi.com Blumojo13@aol.com it runs fine ,you just have to run it 4 or 5 times to get it going.
blumojo13
10104 11 Feb 00 20:51:32 CST [alt-beam] Re: rich TI calculator site beam@sgiblab.sgi.com Steven Dang The address i have for Richard's site is =
http://www.geocities.com/ResearchTriangle/Forum/4225/BEAM.html
Steven Dang
____________________________________________________________________
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10105 Fri, 11 Feb 2000 22:05:56 EST [alt-beam] Re: Smithsonian & More beam@sgiblab.sgi.com Blumojo13@aol.com In a message dated 2/9/2000 5:18:20 PM Pacific Standard Time,
richfile@rconnect.com writes:
> http://richfiles.calc.org
All I get is a blank page.
blumojo13
10106 Fri, 11 Feb 2000 19:20:05 -0800 [alt-beam] Re: Light Duty Electric Welder beam@sgiblab.sgi.com Bruce Robinson Richard Piotter wrote:
>
> MIG
MIG = Metal Inert Gas.
Conventional stick welding relies on flux fumes to shield the molten
metal from oxygen. MIG is flux-less: it uses argon gas to shield the
molten weld (argon being very inert and very expensive). No flux is
used. One downside is that the UV is much more intense, because the flux
fumes in stick welding also block a lot of UV. You'll need at LEAST one
shade darker on your welding helmet, probably two.
Nice thing about MIG is it's very clean (no slag to chip) and it is
relatively cool compared to stick welding. Poor welding technique
becomes VERY visible (so guess why I still do stick welding).
MIG units use wire feed instead of electrodes. Squeeze the handle and
the wire starts feeding, so you can keep your hand a constant distance
from the weld and just concentrate on your weld puddle. The handle also
turns on the argon flow, so you only use it up when you need it.
The flux core wire feed units combine the advantages of wire feed with
the lower cost and simplicity of flux welding.
> Brazing
Same principle as soldering, only at much higher temperatures. Special
brass brazing rods are used, along with a typical welding torch. If you
were brazing steel, you would heat the base metal with your torch to
just above the melting point of your rod (red hot), and then apply the
brazing rod just as you would solder.
MUCH stronger than welding -- up to 70,000 PSI, which makes it as strong
as a welded joint. The big advantage is that you aren't melting your
base metal, so you can braze much smaller cross-sections, or thing
sheet.
You need flux with brazing. Conventional practice is to stick the tip of
a hot brazing rod into a small container of flux, but flux-coated rods
are available and simple to use. Since the temperatures aren't as high
as for gas welding, you don't need to use acetylene, either. For small
work you can use the small oxygen bottles available at hardware stores,
along with typical small gas bottles.
> Also, what's the purpose of the argon gas?
Just to shield molten metal from oxygen. The oxides of most metals melt
at much higher temperatures than the base metal, so they interfere with
the welding process (not to mention that you're burning away your base
metal at these temperatures). Aluminum oxide, for example, is a ceramic.
Argon is used because it's truly inert and won't react with the molten
metal.
That do-it-yourself welder that Sathe Dilip found looks very
interesting, too.
Bruce
10107 Fri, 11 Feb 2000 22:20:15 EST [alt-beam] Re: Smithsonian beam@sgiblab.sgi.com Blumojo13@aol.com is there a site address for Smithsonian to check this out on line?
blumojo13
10108 Fri, 11 Feb 2000 22:19:39 EST [alt-beam] Re: BEAM at school beam@sgiblab.sgi.com TurtleTek@aol.com Speaking of getting BEAM into the school community, I'm currently working
towards getting a robotics club at my high school. I don't know if many will
be interested but if we can get around 5 people to become serious members, it
would be worth it. The only thing I fear is that we'll have many people
getting into it just for the "coolness" of robotics but once they realize it
actually requires learning and thinking, they'll drop it. Those that remain
might feel pressure to drop it after all their buddies do.
The pros if this works out would be great. Building in the physics lab
every week or so, solar roller races, perhaps even group trips to the BEAM
Games or workshops. Now if I can only get this thing started...
-Brien the TurtleTek
10109 11 Feb 00 21:27:15 CST [alt-beam] Re: rich TI calculator site beam@sgiblab.sgi.com Steven Dang Sorry wrong richard
Steven Dang wrote:
> The address i have for Richard's site is =
> http://www.geocities.com/ResearchTriangle/Forum/4225/BEAM.html
> =
> Steven
____________________________________________________________________
Get free email and a permanent address at http://www.amexmail.com/?A=3D1
10110 Fri, 11 Feb 2000 22:34:24 -0600 [alt-beam] Richfiles beam@sgiblab.sgi.com Richard Piotter I've said it before... The server must be down. I can't help it cause
it's not my server. I get my space for free, and till recently, it's
been reliable. I need to contact the owner about it.
Blumojo13@aol.com wrote:
>
> In a message dated 2/9/2000 5:18:20 PM Pacific Standard Time,
> richfile@rconnect.com writes:
>
> > http://richfiles.calc.org
> All I get is a blank page.
> blumojo13
--
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!!!
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10111 Sat, 12 Feb 2000 15:55:31 +1100 [alt-beam] Re: 74x240 question beam@sgiblab.sgi.com "Ben Hitchcock" thanks for the responses.
>From: Bruce Robinson
> Hi, Ben. Are you ganging 3 drivers on the same chip, or stacking 3
> chips, pin for pin.
Ganging 3 drivers on the same chip.
I'm using a 1F cap, charged to about 2.8 volts. The motors run fine
connected directly to the cap, or when I use a driver transistor.
Oh well...
Ben
10112 Sat, 12 Feb 2000 06:17:11 +0100 [alt-beam] SECRETS REVEALED!!! jeu10@hypercube.or.jp jeu10@hypercube.or.jp (jen) *******************************************************
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10113 Sat, 12 Feb 2000 00:57:25 -0500 [alt-beam] Re: 74x240 question "Dennison Bertram" I just sort of jumped into this conversation, but it would seem that you
might be running into a problem then. If the cap is charged to 2.8 volts
then you probably won't have a working circuit if your using a xx240 to run
something. Logic high for a xx240 is represented as + 5 volts. So, your just
a little over half that requirement. Sure the motor may run directly, but
remember the requirements the chip logic itself will make on the power
supply. Chips tend to especially draw lots of current if the logic level of
things is 'inbetween' low and high. Sorta like 2.8 volts. Anyway, like I
said, I just jumped into the conversation, so that migth help. Whatever it
is your talking about.
dennison
I'm using a 1F cap, charged to about 2.8 volts. The motors run fine
connected directly to the cap, or when I use a driver transistor.
Oh well...
Ben
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