RBiggin

In the original post you say old arc welder and sadly no torch. the arc welder is capable of cutting ramp up the power and let it blow cuts this way are not as clean as a torch and use a considerable amount of rod but it can be done. This was one of the first things my grandpa taught me when he was teaching me to weld at as a pre-teen.

probably the best idea i have seen yet for a variable speed setup thank you for sharing.

these sound like they are A kin to a set of lenses my colorblind uncle had that he could mount on his glasses for discerning different color wires for doing electronic work the filters actually gave him color vision that was accurate to the diagrams he was working with. kind of hard to do electronics when red and green both show up as brown.