Most strong and thick sheet metals will require power tools for cutting, such as an angle grinder, band saw, rotary tool, ...

This quick and dirty angle grinder circle cutter certainly fills the bill, and makes decent cuts in sheet metal to boot ... and makes a surprisingly clean cut. Check out the build and the tool ...

The base and bed of the machine are welded from scrap steel I-beams, and the ways are made from angle iron that has been ground flat with a clever jig to hold an angle grinder. The angle grinder ...