DIY-Welder - Build your own Arc, MIG and TIG welder Page hits:

The DIY welder needed a wire feeder that ran off 12V for MIG. I found I had almost all the parts needed to make one.

 I started with a plastic cutting board as the motor and rollers need to be electrically isolated. The brass tube on the left was turned from a solid block of brass. It was made for my Clarke when I converted it to use a Tweco gun.
 The motor and gearbox I already had. It just happened to have a 3/8" output shaft. So, I can use the rollers I made for the Airco feeder.
 Here's the ider wheel. I have re-done it with a tab that sticks out inder the spring.
   I built a frame out of 1.5" angle iron.
 Here's the welds. Turns out this is some odd hardened steel that does not weld real well.
 Here's the almost completed feeder. A added a front panel with purge and speed controls, a hub for the wire reel and a gas valve. The gas valve was the only thing I had to buy to build the feeder. There is also a small circuit to control the motor speed. I have also added a carrying handle.

I have added a contactor (lawn mower starter relay.) I also have a new geared motor coming in.