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Posted by on May 26, 2006, 2:56 pm
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I am interested in adapting a small engine starter/generator such as
might be found on a golf cart or lawn tractor to fit my Lincoln SA 200
welder (old enough to never have had a starter - or ring gear). I have
in mind to simply drive the crank pulley with a synchronous (toothed)
or v-belt. The engine is a low compression four cylinder flathead of
about 162 cu in producing something like 30 hp and is not hard to turn
over with a hand crank. Does anyone out there know what sort of pulley
or gear reduction is used on those golf cart starter/generators. I
suspect that the starter/generators don't spin nearly so fast as a
typical automotive starter, nor is the driven pulley nearly so large as
an automotive ring gear.
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Posted by Don Young on May 27, 2006, 12:02 am
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>I am interested in adapting a small engine starter/generator such as
> might be found on a golf cart or lawn tractor to fit my Lincoln SA 200
> welder (old enough to never have had a starter - or ring gear). I have
>
> in mind to simply drive the crank pulley with a synchronous (toothed)
> or v-belt. The engine is a low compression four cylinder flathead of
> about 162 cu in producing something like 30 hp and is not hard to turn
> over with a hand crank. Does anyone out there know what sort of pulley
>
> or gear reduction is used on those golf cart starter/generators. I
> suspect that the starter/generators don't spin nearly so fast as a
> typical automotive starter, nor is the driven pulley nearly so large as
>
> an automotive ring gear.
>
I recall the starter/generators having about a 1 to 3 or 4 belt ratio. I
really don't think one will adequately start your engine as they are
intended to start the one cylinder engines of about 10 hp or so and the
torque is pretty limited.
What about adapting an outboard flywheel with a ring gear? It might be
possible to use the welding generator as a starter. Onan generators used a
scheme like that for many years
Don Young
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Posted by on May 27, 2006, 9:38 am
Please log in for more thread options Thanks, Don.
The "motorize the generator" idea is a good one and I've actually run a
thread about it here. The biggest problem is that the generator is 40V
DC, so it would presumably take about 3 12v batteries in series to
motorize it. Your comment about the Onan generators is interesting, I
didn't know about that. Do you remember the specifics, i.e., voltage,
wiring, battery charging, etc.? I assume the Onan generators were
designed to produce AC power - how did they get the dc battery to
motorize the ac generator - maybe it's not that hard, I know 110 v dc
will run just about any tool that uses a 110 ac motor with brushes.
How were you thinking I might adapt an outboard flywheel?
Bruce
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Posted by Don Young on May 28, 2006, 12:27 am
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> Thanks, Don.
>
> The "motorize the generator" idea is a good one and I've actually run a
> thread about it here. The biggest problem is that the generator is 40V
> DC, so it would presumably take about 3 12v batteries in series to
> motorize it. Your comment about the Onan generators is interesting, I
> didn't know about that. Do you remember the specifics, i.e., voltage,
> wiring, battery charging, etc.? I assume the Onan generators were
> designed to produce AC power - how did they get the dc battery to
> motorize the ac generator - maybe it's not that hard, I know 110 v dc
> will run just about any tool that uses a 110 ac motor with brushes.
> How were you thinking I might adapt an outboard flywheel?
>
> Bruce
>
I don't know the details but the Onan AC generators used a separate winding
and commutator on the rotor as an exciter to provide DC power for the field
windings. The battery was connected to the exciter generator windings for
cranking.
I remember the very old Delco 32VDC farm light plants also had no separate
starter and connected the 32V system battery to the generator for cranking.
What I envisioned for an outboard flywheel was just mounting a flywheel of
any sort with a ring gear to either end of the machine (or perhaps between
the engine and generator) and then using a conventional starter supported on
a bracket of some sort.
If your welder uses a Continental engine, versions of these engines with
starters were extensively used on welders, forklifts, pumps, generators,
combines and other machinery. It might be possible to adapt parts from a
starter equipped engine.
Don Young
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Posted by digitalmaster on May 28, 2006, 12:53 am
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>
>>I am interested in adapting a small engine starter/generator such as
>> might be found on a golf cart or lawn tractor to fit my Lincoln SA 200
>> welder (old enough to never have had a starter - or ring gear). I have
>>
>> in mind to simply drive the crank pulley with a synchronous (toothed)
>> or v-belt. The engine is a low compression four cylinder flathead of
>> about 162 cu in producing something like 30 hp and is not hard to turn
>> over with a hand crank. Does anyone out there know what sort of pulley
>>
>> or gear reduction is used on those golf cart starter/generators. I
>> suspect that the starter/generators don't spin nearly so fast as a
>> typical automotive starter, nor is the driven pulley nearly so large as
>>
>> an automotive ring gear.
>>
> I recall the starter/generators having about a 1 to 3 or 4 belt ratio. I
> really don't think one will adequately start your engine as they are
> intended to start the one cylinder engines of about 10 hp or so and the
> torque is pretty limited.
>
> What about adapting an outboard flywheel with a ring gear? It might be
> possible to use the welding generator as a starter. Onan generators used a
> scheme like that for many years
>
> Don Young
>
I have cranked on welding machine from another by briefly connecting the
welding lead from one to the welding lead of another.We had 4 welders on the
job..just hand cranked one the "jumped" the others.
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> might be found on a golf cart or lawn tractor to fit my Lincoln SA 200
> welder (old enough to never have had a starter - or ring gear). I have
>
> in mind to simply drive the crank pulley with a synchronous (toothed)
> or v-belt. The engine is a low compression four cylinder flathead of
> about 162 cu in producing something like 30 hp and is not hard to turn
> over with a hand crank. Does anyone out there know what sort of pulley
>
> or gear reduction is used on those golf cart starter/generators. I
> suspect that the starter/generators don't spin nearly so fast as a
> typical automotive starter, nor is the driven pulley nearly so large as
>
> an automotive ring gear.
>