I have owned a Millermatic 200 for a few years, and it is a great welder for my hobby/garage repairs. I am in the midst of constructing some extensions for a new table saw from aluminum square tubing ... so, I needed a Spool gun.

I have just received my Spoolmatic 1 (thank goodness for national Craigslist searches ... it was in MI and I'm in NC!). The gun is the 4-pin plug type as is my MM200. It hooks up fine, and seems to work OK.

I did a lot of searching to see if I could find a manual showing how the MM200 and the SM 1 work together (in particular, what settings to use for the various thicknesses I plan to weld). No luck, although I found a lot of info on parts and assembly.

So I then did some searching in the archives and found the link to the Miller calculator showing voltage and wire speed ... very helpful except the MM200 doesn't show the voltage in use! Is there a x-reference that shows the voltage on each setting on the MM200?

In case it helps. I'm working with 6061 2" square tube with .125" wall thickness. I have an Argon bottle as well.

Thanks for any assistance that might be given!