Alt-BEAM Archive
Message #01191
To: "Chris Daniel" popjester@hotmail.com, beam@corp.sgi.com
From: Dave Hrynkiw dave@solarbotics.com
Date: Sat, 27 Feb 1999 13:08:49 -0700
Subject: [alt-beam] Re: Aquabots
At 08:48 AM 2/27/99 , Chris Daniel wrote:
I forgot to ask, to those have made an aquabot
before - would
pagermotors work?
Yup. Scotty's used them in the "wings", direct-driving little
props he found on sale on toy boats.
and would I need to gear them at all or
can I just
attach the prop to the shaft (with an extention so I can waterproof
it
of course)?
Scotty's were fully submerged, although I am sure this will lessen the
overall lifetime of the pager. You can build a "Stuffing box",
which is a sleeve over the shaft that contains grease which should keep
the water out.
And if I solder leads to the solar cells
from solar botics,
if I dung the end with pads in hot wax or somthing then is the rest of
the cell going to be ok?
I've seen them discolor, but they still seem to work fine, even fully
exposed to water.
-Dave
---------------------------------------------------------------
"Um, no - that's H,R,Y,N,K,I,W. No, not K,I,U,U, K,I,_W_.
Yes,
that's right. Yes, I know it looks like "HOCKYRINK." Yup,
only
2
vowels. Pronounciation? _SMITH_".
http://www.solarbotics.com/"
EUDORA=AUTOURL>http://www.solarbotics.com
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1192 Sat, 27 Feb 1999 19:29:28 +0000 [alt-beam] Re: questions beam@corp.sgi.com Enci >>
>> I recently recieved an isolation transformer from a fixit store, and was
>> wondering what i can do with it. I have never had any experience with
>> one before, and i don't even know what it does.
>
>It has a 1:1 ratio. It is used when you need to isolate a circuit from
>ground. They are used a lot in audio. it kills the "60Hz harmony"
If its a power ioslation transformer, they are used for electrical safety.
Simply put there is no direct connection to the mains supply. Down side
usually big, lumpy and heavy. Up side can save your life.
>
>> and third, is there a really quick was to desolder componants. I have a
>> desoldering tool with a vaccume bulb, but it takes hours to desolder
For large solder removal I prefer to use a plunger type desoldering tool.
You compress a spring buy pushing down on a plunger. Then press a button to
release the spring, creating a vacum, which sucks solder into the tool.
Just keep a spare nozzle. Most of the nozzles are high temp plastic,
they do last ages, but tend to need replacing when you dont have one.
For fine solder removal I use desolder braid. Dont be tempted to use it for
all
desoldering jobs.. its an expensive way to desolder.
There are also desoldering stations. I think they look nice on the
workbench. :-)
Finally, remember to "wet" your iron tip with solder before you desolder
the component.
>> ic's. Is there a flux or something that will melt the solder, but
>> nothing else?
Not that I know of.
Enci
--
"Minds are like parachutes, they don't function well unless they are open."
- Unknown
"Everything should be made as simple as possible, but not simpler."
- Albert Einstein
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