Crazy idea?

Mebbe I shud jest leave things be... But here goes my crazy idea. I
have a Ford 9N tractor. The hydraulics that raise the arms of the 3
point hitch system are powered by the same system that spins the PTO.
This means that when the post hole digger is kept raised it also must
be spinning. This is dangerous but that's the way the 1939 tractor was
made.
The tractor is a 6 volt system. I have a 12 volt clutch that I am
thinking about interposing between the PTO and the post hole digger.
The clutch draws about 5 amps and the generator can put out 11 amps.
So what if I arrange, with some sort of switching, to have the
generator connected in series with the 6 volt battery to power the
clutch whenever I am using the post hole digger? Crazy idea? I could
change the tractor to 12 volts but that would require a new
alternator, battery, and coil. As well as the kit to make an
alternator fit the tractor.
Since the battery and generator are new I can't justify to myself
that replacing them needed to be done anyway so why not convert to 12
volts.
Since I have a machine shop the mechanical part can be done
properly. But just because I can engineer and build the mechanical
part doesn't qualify me to judge the electrical part of my scheme.
Thoughts?
Thanks,
Eric

 

[George Herold]

On Monday, May 6, 2019 at 11:24:16 PM UTC-4, et...@whidbey.com wrote:

Mebbe I shud jest leave things be... But here goes my crazy idea. I
have a Ford 9N tractor. The hydraulics that raise the arms of the 3
point hitch system are powered by the same system that spins the PTO.
This means that when the post hole digger is kept raised it also must
be spinning. This is dangerous but that's the way the 1939 tractor was
made.
The tractor is a 6 volt system. I have a 12 volt clutch that I am
thinking about interposing between the PTO and the post hole digger.
The clutch draws about 5 amps and the generator can put out 11 amps.
So what if I arrange, with some sort of switching, to have the
generator connected in series with the 6 volt battery to power the
clutch whenever I am using the post hole digger? Crazy idea? I could
change the tractor to 12 volts but that would require a new
alternator, battery, and coil. As well as the kit to make an
alternator fit the tractor.
Since the battery and generator are new I can't justify to myself
that replacing them needed to be done anyway so why not convert to 12
volts.
Since I have a machine shop the mechanical part can be done
properly. But just because I can engineer and build the mechanical
part doesn't qualify me to judge the electrical part of my scheme.
Thoughts?
Thanks,
Eric

Huh, I've got a TO-20 Ferguson. (same arrangement)
How about just getting a marine 12 V battery and charge it
off the AC line before and after using the post hole digger?
You could try that first anyway.

Otherwise I think it could sorta work 6 V at 11 amp in and
12V 5 amp out... you will have some losses so maybe less
than 5 amp out.

Hey here's another crazy idea. Buy another six volt battery,
run in series to power 12V clutch, and then when done have some
transfer switch that lets you charge one, or the other 6V battery
(or both...) off the generator.

George H.

 

[John Larkin]

On Mon, 06 May 2019 20:25:48 -0700, etpm@whidbey.com wrote:

Mebbe I shud jest leave things be... But here goes my crazy idea. I
have a Ford 9N tractor. The hydraulics that raise the arms of the 3
point hitch system are powered by the same system that spins the PTO.
This means that when the post hole digger is kept raised it also must
be spinning. This is dangerous but that's the way the 1939 tractor was
made.
The tractor is a 6 volt system. I have a 12 volt clutch that I am
thinking about interposing between the PTO and the post hole digger.
The clutch draws about 5 amps and the generator can put out 11 amps.
So what if I arrange, with some sort of switching, to have the
generator connected in series with the 6 volt battery to power the
clutch whenever I am using the post hole digger? Crazy idea? I could
change the tractor to 12 volts but that would require a new
alternator, battery, and coil. As well as the kit to make an
alternator fit the tractor.
Since the battery and generator are new I can't justify to myself
that replacing them needed to be done anyway so why not convert to 12
volts.
Since I have a machine shop the mechanical part can be done
properly. But just because I can engineer and build the mechanical
part doesn't qualify me to judge the electrical part of my scheme.
Thoughts?
Thanks,
Eric

One trick is to charge a 6 volt battery, maybe a motorcycle sized
battery, in parallel with the main 6V one, and switch them in series
with a relay when you need 12.



--

John Larkin Highland Technology, Inc

lunatic fringe electronics