Essentially you should calculate the centerline arc.
How to roll sheet metal into a tube.
When sheet metal is inserted between two such rolls the urethane wraps the sheet metal tightly against the steel roll.
This is 2 x 2 with a 25 wall thickness stainless square tube rolled into complete metal tube rings with an inside radius of 6 inches.
Forming radius bends in sheet steel would normally be done with slip rolls but acceptable work for a lot of jobs can be done using a piece of pipe.
Outside diameter thickness x 3 1416 length of plate required inside diameter thickness x 3.
To develop the blank flat length for a cylinder rolled from sheet or plate is quite simple.
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Tip add a bead of silicone sealant along the overlapping edge if you require the cone to be water tight.
Rocdoc 4 331 547 5.
At jorgenson metal rolling forming located in santa ana california we specialize in tube rolling and pipe rolling.
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.
We do tube bending and tube rolling in steel aluminum and stainless steel.