Probably the preferred method for cutting intricate or thick aluminum the water jet focus a very thin stream.
How to cut aluminum sheet metal.
Industrial cutting water jet.
Larger presses can be loaded with.
To cut the sheets of metal rathe.
An air powered sheet metal nibbler or a nibbler head attached to a power drill can cut through galvanized corrugated aluminum sheet as well as flat sheet up to 16 gauge.
Then create a pilot hole within the penciled circle.
With the aid of a straight edge and a sharp knife score both sides of the aluminium sheet.
Bench mounted tools such as shears or band saws cut aluminum sheet relatively slowly and with varying amounts of accuracy.
Sheet aluminium can be cut without the need for a guillotine or tin snips which tend to deform the metal.
Modern lasers will be effective.
Step 5 optional if your project requires cutting a hole in the center of sheet metal draw it on the metal as you would any other cut line.