A roller machine clamps the metal between a hard metal form usually a humped shape and a heavy duty roller.
How to shape sheet metal by hand.
This video shows how to create and form your own sheet metal parts with limited tooling.
Shaped plastic mallets used with shot bag backing is a particularly effective hand forming combination.
Create curves in the steel by using a hammer and form or a mechanical roller machine if you have one.
Every autobody practitioner has some favorite backing surface for hammering metal.
Rolling the sheet back and forth by hand curves and thins the metal as you guide it into the shape you want.
After all there are only four things you can do to metal.
Cut it bend it shrink it and stretch it.
These can range from anvils to blocks of various woods and even plastic materials.
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With a combination of these manipulations you can create anything from flat sheet and you.