So a straight edge is the way to go...Kind of what Ive been doing. Still trying to figure out the center line of the arc so I can get a more precise cut/ dimension. Im working with 18ga sheet metal right now, but I have some bumper projects coming up that will require long STRAIGHT cuts.
It seems that the cut width is a bit wider than I thought, but that may be that Im still tenuous with it and not moving fast enough. It SHOULD be the width of the dia. of the hole in the nozzle, right? Maybe a little more?
Thanks for the replies.
I got some really good feedback here.