Cut out the semicircle with scissors.
How to cut and form a cone from sheet metal.
You can find cone calculators online.
As you do this you will see the circle begin to contract into a cone.
Sheet metal cone calculator.
Beginning at the cut push the pieces of sheet over each other.
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Enter hole slant height up slanting edge of the cone and hole diameter and hit draw.
With the semicircle aligned on the straight edge of the paper only the curved part needs to be cut.
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I used aluminum sheet coil but you could use paper or any flat material.
Roll the cone template into a cone shape starting at the wide end working toward the pivot point end.
Drill a few holes through the overlapping rectangular shape.
Cut out your cone template from the sheet metal using your tin snips then file the edges smooth to avoid cutting yourself or someone else with the cone.
Enter top width bottom width and height of the cone see diagram and hit calculate to draw a full scale printable pattern template to mark out the cone.
Depending on how deep you want the cone stop where needed.
This will form the bottom edge of the cone so make cuts as neat as possible.
Overlap one cut side onto the other.
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.
View the cone instructions below to learn how to manually layout the flat pattern for a truncated cone in single or multiple gore sections.
The cone has a diameter at the top smaller than the diameter at the bottom and to accurately trace the shape onto sheet metal you need to make a template out of construction paper.
Step 5 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.
To mark holes or lines around the cone check holes or lines and enter number of incremetns.
