I've also seen a pantograph unit on a flame cutter; instead of manually tracing a jig it had a magnetic follower, so one created a maquette out of thin sheet me

I've also seen a pantograph unit on a flame cutter; instead of manually tracing a jig it had a magnetic follower, so one created a maquette out of thin sheet metal by some other method, and then it would cut the same/scaled shape out of massive (5cm?) steel.