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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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> 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 :-)
> - -