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Posted by RoyJ on March 24, 2006, 11:45 pm
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Good chance you can get it to work, the old timers did a lot of things
that are not exactly perfect. My small tractor has a stater/generator
that does exactly what you want to do. Not sure the specifics on yours
without seeing it.
BFR wrote:
>>Is there a ring gear anywhere on that motor?
>
>
> No, that's the problem. The welder was manufactured without either a
> starter or any provision to install one. Since I know old timers used
> to start such welder by hooking the leads from a running one to the
> leads of the one to be started, thereby motorizing the generator and
> turning over the engine, it seems that using batteries to do the same
> thing would work as well. Why would connecting the batteries to the
> welding leads to motorize the generator constitute a dead short? Many
> dc motors are run off batteries and that doesn't constitute a dead
> short. What do I not understand about this?
>
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Posted by BFR on March 25, 2006, 12:33 pm
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> Not sure the specifics on yours without seeing it.
It's a 40 volt dc generator. At full song it puts out about 250 amps
for welding. I was thinking three 12 volt car batteries in series,
while only 36 volts, might provide enough juice to motorize the
generator thereby spinning and starting the engine drive. Of course,
as soon as the engine cranks the generator will start producing 40 volt
current and, I assume, back feeding the batteries absent some circuitry
(like the electrical equivalent of a check valve perhaps) that would
prevent the backfeed - I don't know enough about electricity to know
what such circuitry might be or how to wire it. A primitive solution
might be to just have a spring loaded starter switch that would be
released (by me) as soon as the engine caught, thereby disconnecting
the batteries. It shouldn't be too hard to install an alternator on
the engine to charge the batteries. This might sound like a lot of
trouble and expense - batteries alone are about $50 each - but a ring
gear and starter for an SA200 from Lincoln runs well over $600 and it
would still have to be installed which might require the purchase of
additional parts. Do you, or anyone else out there, have an idea about
how to do that? Also, am I correct in assuming that polarity, i.e.
which side of the batteries should be connected to which side of the
welder leads, would determine which direction the generator would turn
thereby either cranking the engine backwards or forwards?
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Posted by Ignoramus31268 on March 25, 2006, 1:25 pm
Please log in for more thread options Do you have a manual for it? Any idea how many amps does it take to
start one? Can you scrounge 3 batteries (maybe from your cars) and a
DC shunt rated for a lot of amps, and see how many amps it takes to
spin one up?
I have a DC battery charger for sale pictured here
http://yabe.algebra.com/~ichudov/misc/ebay/PP-1104C_G-DC-Power-Supply/
it can produce 50 amps at 39 volts. (rated for 28 nominal, but can do
more).
If you are local to me (NE Illinois), you could buy one and use it for
a variety of purposes.
i
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Posted by BFR on March 25, 2006, 2:10 pm
Please log in for more thread options I have a manual for the welder, it says the generator is a 40 volt
generator and puts out between 40 and 250 amps. I am not knowledgeable
enough to know what you mean by a dc shunt. Where would I find one of
those and what is a "lot of amps" - when you say "spin one up" are you
talking about the shunt, the generator, or what? Scrounging 3 12 volt
car batteries is not a problem. I am in Texas so NE Illinois is not
very close; also, I have a couple of dc battery charges where I keep
the welder, but I assume they put out only 12 volts or so since they
are intended to charge only one battery at a time. Thanks for your
help.
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Posted by Clif Holland on March 25, 2006, 3:56 pm
Please log in for more thread options >I have a manual for the welder, it says the generator is a 40 volt
> generator and puts out between 40 and 250 amps. I am not knowledgeable
> enough to know what you mean by a dc shunt. Where would I find one of
> those and what is a "lot of amps" - when you say "spin one up" are you
> talking about the shunt, the generator, or what? Scrounging 3 12 volt
> car batteries is not a problem. I am in Texas so NE Illinois is not
> very close; also, I have a couple of dc battery charges where I keep
> the welder, but I assume they put out only 12 volts or so since they
> are intended to charge only one battery at a time. Thanks for your
> help.
>
I have a simple question, How did they start the first one?? Crank probably.
If so a properly tuned engine will kick right off with one or 2 cranks. Why
not see how hard it is to crank?
--
Clif
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