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Posted by ed_h on April 30, 2008, 11:03 pm
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This is a coincidence...I just posted a link on this very thing
(except for a Miller 175) on HSM just a few days ago. Here's the
link:
http://bullfire.net/WP_Welder.html
On Apr 29, 9:06=A0pm, e...@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 =A0is 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. =A0I
> 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 BobH on April 30, 2008, 11:12 pm
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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
Hi Eric,
I looked at the schematic and your explanation and you did a good job
with it. You protected the other functions of the welder from the purge
button operation. The current through the opto is in a good range.
that's about all you need to do for this one.
I'm glad to see you posting again, you often have interesting stuff to
say or ask.
Take Care,
BobH
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Posted by on May 1, 2008, 1:15 am
Please log in for more thread options On Thu, 01 May 2008 03:12:28 GMT, BobH
Thanks Bob, it's good to know that the circuit might work for someone
else.
Cheers,
Eric
>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
>Hi Eric,
>I looked at the schematic and your explanation and you did a good job
>with it. You protected the other functions of the welder from the purge
>button operation. The current through the opto is in a good range.
>that's about all you need to do for this one.
>
>I'm glad to see you posting again, you often have interesting stuff to
>say or ask.
>
>Take Care,
>BobH
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Posted by Brian Lawson on May 1, 2008, 5:50 pm
Please log in for more thread options 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 Up North on May 2, 2008, 8:55 am
Please log in for more thread options
> 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
I would think a wire feed button would be more useful. My Panasonic 260 has
one on it but on my old Lincoln SP100 I just left the gas off when feeding a
new spool to the gun.
Steve
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> 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 =A0is 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. =A0I
> hope this is useful to someone. Please feel free to tell me how it
> could have been done better.
> Cheers,
> Eric R Snow