I have an iron bar, an inch and a half wide by a quarter inch thick and three feet long. I needed to cut about six inches from that. I wasn’t worried about the cut being particularly smooth so I used a cutting wheel on my rotary tool (I call it a dremel but that’s actually a brand name and mine isn’t that brand, but you know what I mean). I love cutting metal. A hack saw would have worked by it would have been a lot more tiring and not nearly as bright. A little while after I started I decided to take a few pictures. The problem is that the sparks are pretty bright compared to the rest of the scene and getting that balanced would be easier in daylight. Anyway, this one turned out nicely. The disc in this picture is only about an inch in diameter, in case you’re wondering.