Just make sure the ground is clean, and hold the tip OFF the metal about an 1/8 to 1/4 of an inch. If you run it against the surface the tips gum up pretty quick and you"ll get a crappy cut, but you'll have to finish with some grinding no matter how good the cut is. For those 1/8" thick brackets a small 110 rig will be fine, and you will love how easy the metal falls. Have fun.