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Posted by on April 30, 2008, 2:17 pm
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On Wed, 30 Apr 2008 02:07:16 -0400, Brian Lawson
Greetings Brian,
I don't know why the tif would be empty. I'll check it and see if
maybe I can re send it. I got the original schematic from the Lincoln
web site but cannot find it now. As for the purge, it just makes sure
that there is shielding gas instead of air present at the weld when
welding starts. I had to run wire out and snip it off before I made
the change. It sucks to have porosity in a weld and it happens when
you wait too long between trigger pulls.
ERS
>Hey Eric,
>
>Nice to see your name again. It has been some time!! I do understand
>the bit about "the house" though. Welcome to the club!!
>
>Regards your drop-box submission, I get the text up OK, but the TIF
>seems empty.
>
>I have a similar MIG, and just wonder what the purpose of your mod is.
>Purge? I always think that is a way to clear former gases, but maybe
>you are suggesting that you fill the torch line with pressure prior to
>the arc starting the gas flow. Is that it?
>
>Take care.
>
>Brian Lawson,
>Bothwell, Ontario.
>XXXXXXXXXXXXXX
>
>
>On Wed, 30 Apr 2008 02:06:44 GMT, etpm@whidbey.com wrote:
>
>>Greetings All,
>>I haven't posted or read any newsgroups for a long time. I am still
>>finishing up my house and it has been really all consuming. Anyway, I
>>know that there are a few folks here who have a Lincoln SP125 Plus
>>welder. I added a purge button to mine a while ago and it is a big
>>help. Saves wire and time. It would have been simple to use just a
>>switch to actuate the gas solenoid but the solenoid is a 125 volt unit
>>and I wanted to only switch low voltage. So instead I figured out how
>>to use the low voltage circuitry that the welder uses. I'm sure that
>>there is a better way but since my knowledge of electronics is so
>>limited it is what it is. I sent the circuit changes and the scanned
>>schematic to the dropbox a few minutes ago. Look for files beginning
>>with SP125+. After I made the changes I coated the circuit board with
>>epoxy in the areas where I had to remove the conformal coating. It's
>>important to prevent any conductive dust from shorting anything. I
>>hope this is useful to someone. Please feel free to tell me how it
>>could have been done better.
>>Cheers,
>>Eric R Snow
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Posted by dan on April 30, 2008, 10:42 pm
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What's that Lassie? You say that etpm@whidbey.com fell down the old
rec.crafts.metalworking mine and will die if we don't mount a rescue
by Wed, 30 Apr 2008 02:06:44 GMT:
<snip>
> Anyway, I
>know that there are a few folks here who have a Lincoln SP125 Plus
>welder. I added a purge button to mine a while ago and it is a big
>help. Saves wire and time.
<snip>
>Eric R Snow
I had thought about doing that to mine too. I was thing of adding a
second switch to the torch, that would trigger the gas valve.
Then I thought of adding a small reservoir and a very low pressure
switch. The torch switch would open the gas valve, and when pressure
has built up, the pressure switch would trigger the welder.
But then I just decided to go easy on the drive roller pressure, and
purge the lines by holding the wire back with my gloved hand.
--
Dan
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Posted by SteveB on May 1, 2008, 1:55 am
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> What's that Lassie? You say that etpm@whidbey.com fell down the old
> rec.crafts.metalworking mine and will die if we don't mount a rescue
> by Wed, 30 Apr 2008 02:06:44 GMT:
>
> <snip>
>> Anyway, I
>>know that there are a few folks here who have a Lincoln SP125 Plus
>>welder. I added a purge button to mine a while ago and it is a big
>>help. Saves wire and time.
> <snip>
>>Eric R Snow
>
> I had thought about doing that to mine too. I was thing of adding a
> second switch to the torch, that would trigger the gas valve.
>
> Then I thought of adding a small reservoir and a very low pressure
> switch. The torch switch would open the gas valve, and when pressure
> has built up, the pressure switch would trigger the welder.
>
> But then I just decided to go easy on the drive roller pressure, and
> purge the lines by holding the wire back with my gloved hand.
> --
>
> Dan
Just curious here. I have a Lincoln 175 SP Plus. What is it with a 125
that putting a purge button does? I seem not to have any problem with my
175.
Steve
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Posted by on May 1, 2008, 9:17 am
Please log in for more thread options >
>
>
>
> > What's that Lassie? You say that e...@whidbey.com fell down the old
> > rec.crafts.metalworking mine and will die if we don't mount a rescue
> > by Wed, 30 Apr 2008 02:06:44 GMT:
>
> > <snip>
> >> Anyway, I
> >>know that there are a few folks here who have a Lincoln SP125 Plus
> >>welder. I added a purge button to mine a while ago and it is a big
> >>help. Saves wire and time.
> > <snip>
> >>Eric R Snow
>
> > I had thought about doing that to mine too. I was thing of adding a
> > second switch to the torch, that would trigger the gas valve.
>
> > Then I thought of adding a small reservoir and a very low pressure
> > switch. The torch switch would open the gas valve, and when pressure
> > has built up, the pressure switch would trigger the welder.
>
> > But then I just decided to go easy on the drive roller pressure, and
> > purge the lines by holding the wire back with my gloved hand.
> > --
>
> > Dan
>
> Just curious here. I have a Lincoln 175 SP Plus. What is it with a 125
> that putting a purge button does? I seem not to have any problem with my
> 175.
>
> Steve
You're welding. You stop for a few seconds, then start again. Start of
the weld is perfect (if you're not me).
But, stop for a longer time, and the shielding gas in the hose near
the torch tip mixes with air, and after a long enough time there's
enough O2 in the line that when you start welding, the first little
bit of weld doesn't get shielded at all, and comes out like crap. The
purge valve lets you run shielding gas out the hose to get rid of any
air in the hose. You could do this by just pulling the trigger, but
then you have to clip off the wasted wire.
Dave
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Posted by SteveB on May 2, 2008, 3:25 am
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> You're welding. You stop for a few seconds, then start again. Start of
> the weld is perfect (if you're not me).
>
> But, stop for a longer time, and the shielding gas in the hose near
> the torch tip mixes with air, and after a long enough time there's
> enough O2 in the line that when you start welding, the first little
> bit of weld doesn't get shielded at all, and comes out like crap. The
> purge valve lets you run shielding gas out the hose to get rid of any
> air in the hose. You could do this by just pulling the trigger, but
> then you have to clip off the wasted wire.
>
>
> Dave
Thought that was the situation. Guess I don't stop enough to have that
problem. I get stuff set up, then weld, and it doesn't have time to run
out.
Steve
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>
>Nice to see your name again. It has been some time!! I do understand
>the bit about "the house" though. Welcome to the club!!
>
>Regards your drop-box submission, I get the text up OK, but the TIF
>seems empty.
>
>I have a similar MIG, and just wonder what the purpose of your mod is.
>Purge? I always think that is a way to clear former gases, but maybe
>you are suggesting that you fill the torch line with pressure prior to
>the arc starting the gas flow. Is that it?
>
>Take care.
>
>Brian Lawson,
>Bothwell, Ontario.
>XXXXXXXXXXXXXX
>
>
>On Wed, 30 Apr 2008 02:06:44 GMT, etpm@whidbey.com wrote:
>