You can find cone calculators online.
How to bend a cone sheet metal.
To remove irregularity or improve uneven bends place a hardwood piece lengthwise along the bend and hit the bend with increased strength using a heavy duty hammer or mallet.
It a job that requires a little skill and a lot of patience.
It allows you to determine either the size of raw material needed or the number of gore sections to fit on your available material.
Sheet metal cone calculator.
Want any raw materials or tools check turntopre.
Draw a circle on the sheet metal with a pencil compass.
Turntopretty howtobendmetal the video tutorial is showing you how to bend plate metal sheet in one minute.
Video of the day volume 0.
Monkeys spinning monkeys by kevin macleod.
Mark one end of the line pivot and the other end wide step 2 cut a length of string with a loop at one end and the other end held at the pivot mark.
In some cases as with thicker sheet of metal you may need to use a sheet metal brake to apply your bend.
You will use the protractor to gauge the brake as you bend the metal little by little.
I used aluminum sheet coil but you could use paper or any flat material.
The pencil will make the circle and the slight indentation where the compass has been anchored should be noted.
Cut the section of metal out or otherwise prepare the metal to be bent by removing any burrs or sharp edges.
Determine the angle at which you want to brake the metal and mark it on the protractor.
Here is one way to make a cone from flat stock.
Draw a line onto your sheet metal the same length as you want the slanted edge of your cone to be.
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.