It strengthens a piece where it s most vulnerable the edges and it protects the wearer from getting gouged or cut by their own armor.
How to roll sheet metal.
When sheet metal is inserted between two such rolls the urethane wraps the sheet metal tightly against the steel roll similar to a radius forming urethane press brake die and since the urethane roller is driven the sheet metal is roll formed into a precise radius.
Roll the template into a cone shape overlapping the sheet metal by 1 2 inch then drill a few holes along the seam and seal it closed by placing rivets in the drilled holes.
In the photos you can see that we start by folding the sheet metal over a sharp edge such as the edge of an anvil or sander stand.
How to roll a round cylinder using a hydraulic roller.
Rolling sheet metal serves two important functions for armoring.
Tip add a bead of silicone sealant along the overlapping edge if you require the cone to be water tight.