Cut around the circle with tin snips and smooth the cut edges with sandpaper to remove all the burrs and sharp points.
How to make a small funnel with sheet metal.
You may want to line the entire edge with tape to ensure it fully adheres.
In the center of the circle measure a 2 inch circle and cut this out with the tin snips once more smoothing the edge.
Thanks for the help.
Mark an 8 inch circle on a piece of sheet metal.
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How should i flair out the sloped sheet to meet the 300 mm on the far top.
Draw a straight line from the outer edge of the circle to the inner edge and cut along it.
Wrap the foil around the model to create the foil funnel.