Cut around the circle with tin snips and smooth the cut edges with sandpaper to remove.
How to make a funnel out of sheet metal.
Overlap the edge of the metal to form a cone.
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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.
Draw a circle on the sheet metal with a pencil compass.
The tapered end of the cone should have an opening approximately.
Drill a few holes through the overlapping rectangular shape.
Mark an 8 inch circle on a piece of sheet metal.
How to make a sheet metal funnel.
When i started drawing it out in autocad i realized that i could make a half circle with a 12 diameter hemisphere for the bottom and a 22 5 for the top.