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Posted by CJensen on April 13, 2007, 8:32 pm
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I recently purchased the spool gun without checking compatibility with MIG
machines. Oops- mistakenly assumed it would work on my relatively new
SP-175 Plus with the adapter harness. After some examination it is clear
that the gas hose will plug in and a 4-pin Amp connector can be retro-fitted
without a problem. The machines recommended for the spool gun obviously
have a new circuit board design and socket connector layout different from
my SP-175. The spool gun switching harness will absolutely not work on my
machine without modification. At first I thought a simple SPDT toggle could
be used to redirect DC current from the internal wire-feed motor to the
spool gun motor, however, they have used a DPDT toggle to open the main
motor circuit and close the spool gun motor circuit from a different power
pin on the CB. I wonder if this is due to different motor speeds required
for the spool gun. Has anyone out there successfully performed the hack to
make this combination work?
Not wanting to go buy another new MIG.
Chuck Jensen
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