Bending a brittle metal beyond its limits could cause the metal to snap and break.
How to bend sheet metal at home.
To clamp efficiently lay your sheet metal on the top surface of your straightedge with the drawn line perfectly aligned with the outside edge of the sheet metal.
Determine the angle at which you want to brake the metal and mark it on the protractor.
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You will use the protractor to gauge the brake as you bend the metal little by little.
0 017453 x 90 x 0 020 0 33 x 0 024 0 0438558984 inch bend allowance keep in mind that some metals are more brittle than others.
Cut the section of metal out or otherwise prepare the metal to be bent by removing any burrs or sharp edges.
As an example if you want to bend 24 gauge sheet metal at a 90 angle the calculation would be.
Simple sheet metal bender using a hand roller clamps and plywood.