This weakens the aluminium and creates a fracture line.
Cutting aluminum sheet clean.
Clamp the aluminum down.
Probably the preferred method for cutting intricate or thick aluminum the water jet focus a very thin stream of water mixed with abrasives at extraordinary pressures and very high speed into the sheet metal.
If you use metal shears to cut thin sheet metal such as duct metal it curls and can be difficult to flaten properly.
These photo steps show that it can be done using a utility knife.
The illustrations are for a small bracket but i have cut 3 foot.
Set the piece of aluminum on a table or over sawhorses and position it so the cutting area has open space underneath it.
2 mark the start and stopping point of your cut.
Sheet aluminium can be cut without the need for a guillotine or tin snips which tend to deform the metal.
To cut the sheets of metal rathe.
How to cut thin sheet metal and keep it flat.