Roll the cone template into a cone shape starting at the wide end working toward the pivot point end.
How to make a funnel out of sheet metal.
Drill a few holes through the overlapping rectangular shape.
The pencil will make the circle and the slight indentation where the compass has been anchored should be noted.
How to make a sheet metal funnel.
Draw a circle on the sheet metal with a pencil compass.
Cut out the cone template from your sheet metal using tin snips and file the edges smooth of any burrs of rough sections with your file.
I needed a funnel with a 6 inch bottom opening and a 22 5 inch top opening to put in 55 gallon barrel for my deer feeder.
Cut around the circle with tin snips and smooth the cut edges with sandpaper to remove.
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Mark an 8 inch circle on a piece of sheet metal.