using a DC motor as a generator, for an AC motor-driven DC welder (pix posted)

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using a DC motor as a generator, for an AC motor-driven DC welder (pix posted) dave 05-21-2008
Posted by Martin H. Eastburn on May 22, 2008, 6:00 pm
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 http://www.youtube.com/watch?v=L68rZh6NnUk

Not me but nice young one helping Dad. Ready welder on 2 batteries.
And charged in the shop.
Martin H. Eastburn
@ home at Lions' Lair with our computer lionslair at consolidated dot net
TSRA, Endowed; NRA LOH & Patron Member, Golden Eagle, Patriot's Medal.
NRA Second Amendment Task Force Charter Founder
IHMSA and NRA Metallic Silhouette maker & member.
http://lufkinced.com/


Martin H. Eastburn wrote:
> There are people that haul 3 batteries and have special circuits
> to charge each in time.
>
> Then they, when climbing rocks and weird stuff - bend a fender or breaks
> something - yank out a Ready Welder and weld up the break.
>
>
> One could set up a wind mill and weld when the wind was there or use
> batteries and charge them up with said DC motor/generator just like
> cars did it in the 50's.
>
> Martin
>
> Martin H. Eastburn
> @ home at Lions' Lair with our computer lionslair at consolidated dot net
> TSRA, Endowed; NRA LOH & Patron Member, Golden Eagle, Patriot's Medal.
> NRA Second Amendment Task Force Charter Founder
> IHMSA and NRA Metallic Silhouette maker & member.
> http://lufkinced.com/
>
>
> Bruce in Bangkok wrote:
>> wrote:
>>
>>> ol' bubba here wants to build a nice cheap DC welder, preferably that
>>> outputs "pure DC" (not rectified AC). Lincoln used to make such
>>> machines, essentially an AC motor driving a DC generator head.
>>> according to numerous sites, most (maybe all?) DC motors can be
>>> 'driven' and used as generator heads.
>>>
>>> I have three DC motors sitting gathering dust, and -plenty- of heavy
>>> angle iron for the frame. plus misc other components, like a nice
>>> rheostat, and the leads. might have to break down and buy a lovejoy
>>> coupling...
>>>
>>> take a quick look at my DC motors here:
>>>
>>> http://machines.freehostia.com/dc_motor_as_generator/
>>> dc_motor_as_a_generator
>>>
>>> which of the three would be my 'best bet' for this idea?
>>>
>>> sure, I'd 'like' it if it put out about 300 amps (and less, too) but
>>> I'll probably settle for what I can get...maybe 150 amps out?
>>>
>>> this doable?
>>>
>>> ps-please, no 'insurance adjuster' or 'fire inspector' type dire
>>> warnings
>>>
>>> thanks, guys,
>>>
>>> toolie :-)
>>>
>>> - -
>>> replies by e-mail, if any, please remove the weirdstuff from my
>>> address before you click 'send' - thanks :-)
>>> - -
>> First of all it is do'able. Popular Mechanics had a long article,
>> years ago, about building a welding machine using a surplus aircraft
>> DC generator. I have also seen an article on the web about doing the
>> same thing - unfortunately I can't find the URL. Try googling various
>> combination of welder, generator, home made, etc., and I'm sure you
>> can find it.
>>
>> The only problem is that you need a low voltage, high amperage
>> generator, say 24 volts @ 300 amps.
>>
>>
>> Bruce-in-Bangkok
>> (correct Address is bpaige125atgmaildotcom)
>
>
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Posted by RoyJ on May 21, 2008, 9:57 pm
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 If you insist on DC output (native mode), you need to find a 24 to 32
volt DC motor where all the current goes through the brushes.

Best way is to find the aircraft generators, they are getting hard to
find but some are still floating around. I have a spare one, price would
be reasonable, shipping the 60 or so pounds is NOT cheap.

dave wrote:
> ol' bubba here wants to build a nice cheap DC welder, preferably that
> outputs "pure DC" (not rectified AC). Lincoln used to make such
> machines, essentially an AC motor driving a DC generator head. according
> to numerous sites, most (maybe all?) DC motors can be 'driven' and used
> as generator heads.
>
> I have three DC motors sitting gathering dust, and -plenty- of heavy
> angle iron for the frame. plus misc other components, like a nice
> rheostat, and the leads. might have to break down and buy a lovejoy
> coupling...
>
> take a quick look at my DC motors here:
>
> http://machines.freehostia.com/dc_motor_as_generator/
> dc_motor_as_a_generator
>
> which of the three would be my 'best bet' for this idea?
>
> sure, I'd 'like' it if it put out about 300 amps (and less, too) but
> I'll probably settle for what I can get...maybe 150 amps out?
>
> this doable?
>
> ps-please, no 'insurance adjuster' or 'fire inspector' type dire warnings
>
> thanks, guys,
>
> toolie :-)
>
> - -
> replies by e-mail, if any, please remove the weirdstuff from my address
> before you click 'send' - thanks :-)
> - -

Posted by Martin H. Eastburn on May 22, 2008, 9:42 pm
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Look at my post prior to this one you wrote - yours is out of sequence
and missed mine. A movie with two batteries.

Off roaders don't haul 3 or 4 batteries for welding. They use 2 or 3 max.

Martin

Martin H. Eastburn
@ home at Lions' Lair with our computer lionslair at consolidated dot net
TSRA, Endowed; NRA LOH & Patron Member, Golden Eagle, Patriot's Medal.
NRA Second Amendment Task Force Charter Founder
IHMSA and NRA Metallic Silhouette maker & member.
http://lufkinced.com/


RoyJ wrote:
> If you insist on DC output (native mode), you need to find a 24 to 32
> volt DC motor where all the current goes through the brushes.
>
> Best way is to find the aircraft generators, they are getting hard to
> find but some are still floating around. I have a spare one, price would
> be reasonable, shipping the 60 or so pounds is NOT cheap.
>
> dave wrote:
>> ol' bubba here wants to build a nice cheap DC welder, preferably that
>> outputs "pure DC" (not rectified AC). Lincoln used to make such
>> machines, essentially an AC motor driving a DC generator head.
>> according to numerous sites, most (maybe all?) DC motors can be
>> 'driven' and used as generator heads.
>>
>> I have three DC motors sitting gathering dust, and -plenty- of heavy
>> angle iron for the frame. plus misc other components, like a nice
>> rheostat, and the leads. might have to break down and buy a lovejoy
>> coupling...
>>
>> take a quick look at my DC motors here:
>>
>> http://machines.freehostia.com/dc_motor_as_generator/
>> dc_motor_as_a_generator
>>
>> which of the three would be my 'best bet' for this idea?
>>
>> sure, I'd 'like' it if it put out about 300 amps (and less, too) but
>> I'll probably settle for what I can get...maybe 150 amps out?
>>
>> this doable?
>>
>> ps-please, no 'insurance adjuster' or 'fire inspector' type dire warnings
>>
>> thanks, guys,
>>
>> toolie :-)
>>
>> - -
>> replies by e-mail, if any, please remove the weirdstuff from my
>> address before you click 'send' - thanks :-)
>> - -


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Posted by Ignoramus12247 on May 21, 2008, 10:22 pm
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The easiest route to take would be to buy a Miller Shopmaster 300
CC/CV AC/DC from me.

i

Posted by RLM on May 23, 2008, 1:02 am
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dave wrote:

> ol' bubba here wants to build a nice cheap DC welder, preferably that
> outputs "pure DC" (not rectified AC). Lincoln used to make such
> machines, essentially an AC motor driving a DC generator head. according
> to numerous sites, most (maybe all?) DC motors can be 'driven' and used
> as generator heads.
>
> I have three DC motors sitting gathering dust, and -plenty- of heavy
> angle iron for the frame. plus misc other components, like a nice
> rheostat, and the leads. might have to break down and buy a lovejoy
> coupling...
>
> take a quick look at my DC motors here:
>
> http://machines.freehostia.com/dc_motor_as_generator/
> dc_motor_as_a_generator
>
> which of the three would be my 'best bet' for this idea?
>
> sure, I'd 'like' it if it put out about 300 amps (and less, too) but
> I'll probably settle for what I can get...maybe 150 amps out?
>
> this doable?
>
> ps-please, no 'insurance adjuster' or 'fire inspector' type dire warnings
>
> thanks, guys,
>
> toolie :-)
>
> - -
> replies by e-mail, if any, please remove the weirdstuff from my address
> before you click 'send' - thanks :-)
> - -
Go to forklift dealers. I've seen complete trucks chucked in dumpsters that
still had motors that were too old or the brand no longer available
(Lewis-Shepard is one example) that had good drive motors in 12, 24 or 36v
models that were sold as scrap. The drive motors would have been perfectly
functional or rebuild-able. By the way Hyster bought Lewis-Shepard,
Automatic Lifts were bought by Eaton Towne & Yale A.K.A. Yale now. There
are others such as Otis, now Baker.

Some of the dealers *don't* want to refurbish some of their own brands that
have some age. It can become a hassle to warrant some unseen problems on
high hour trucks. The motors are not the problem, some come in with
questionable frame repairs or alterations that dealers can't afford to get
caught holding the responsibility for somebody else that didn't know how to
do the job right in the first place. Poor welding practice being a prime
example. There is too much 6011 or 6013 rod in this world of repairs.

Salespeople get better commissions and less complaints on new equipment.

You might also check into golf carts. Some manufacture industrial warehouse
carts that have heavy duty motors that outlast the frame. Most golf carts
are 36 vdc by the way.

HTH

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