I have owned several engine drives including the Bobcat and Trailblazer 301G. The 301G is nice and will do 3/16" and even 1/4" carbons. However, any of these smaller machines with small armatures do not like steady arc gouging. The 350 is a nice step up for sure. Take a look at the Pipe Pro 304 and the Pro 300D. I welded with a Pro 300D this spring and absolutely loved it. If you do go with a Big 40 be sure to invest in the CC/CV Deluxe! That would be my choice.

Weight is a factor to consider in transporting the machine as well.
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