Start by taping both sides of the sheet metal directly over the line you want to cut and clamp the metal to a work station so it doesn t move.
Ways to cut aluminum sheet.
With care and patience full size sheets of aluminium can be cut using this method.
To cut aluminum use a wood cutting saw with carbide tipped blades.
Using a softer piece of material such as wood as a backer will allow the chisel to push through the metal and prevent wear on the chisel s tip.
Flip the sheet over and repeat.
Then bend the sheet back and forth a few times to snap it.
Then grip the saw with both hands and push the blade through the metal to cut it.
Clamp or hold a straightedge or square along the cutting marks and score a line with the tip of a sharp utility knife blade.
And you can use the same technique anytime you need a straight cut on aluminum or other light gauge sheet metal even steel.
For thin sheets of metal you can use tin snips to cut through it.
Cutting aluminum sheet metal with a hammer and chisel is relatively straight forward line up the edge of the chisel along the line you wish to cut and strike the chisel with a hammer.
A handheld cutting tool fitted with a metal cut off wheel will easily cut through sheet.
After a few wiggles the sheet will fracture along the cut line leaving a clean break as shown in the above photos.
Jigsaws and metal cutting band saws are more work but can make most cuts in light to medium sheet metal.
To cut the sheets of metal rathe.
Apply a lubricant like standard oil or saw wax to your blade then slow your cutting speed by reducing the diameter of the cutting blade.