The most suitable bending method depends on the material plate thickness and the circumference of the small diameter.
How to make a sheet metal cone.
Learn autodesk inventor sheet metal tutorial how to create cone object check it out.
By the vertical height divide this product by the difference first obtained large dia and small dia.
Plate rolling is the process in which a cone template is being rolled into the required conical shape by moving it through a three or four roller bending machine.
Both methods will be explained below.
The formula for the cone is first you must find the difference between the large and the small dia.
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.
The easiest way to make a cone is to start with a semicircle then overlap the straight edges until they form a cone shape.
Drill a few holes through the overlapping rectangular shape.
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.
Here is one way to make a cone from flat stock.
You can find cone calculators online.
Once you know how to make a basic cone you can experiment with other materials such as plastic sheeting.
Multiply the large dia.
Sheet metal cone calculator.
Roll the cone template into a cone shape starting at the wide end working toward the pivot point end.
It allows you to determine either the size of raw material needed or the number of gore sections to fit on your available material.
View the cone instructions below to learn how to manually layout the flat pattern for a truncated cone in single or multiple gore sections.
If you want to get more specific however you should start with a circle instead then cut a wedge out.