Draw a line onto your sheet metal the same length as you want the slanted edge of your cone to be.
How to make a cone from sheet metal.
The pencil will make the circle and the slight.
The string should be.
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.
You can find cone calculators online.
If you want to get more specific however you should start with a circle instead then cut a wedge out.
Cut a length of string with a loop at one end and the other end held at the pivot mark.
The easiest way to make a cone is to start with a semicircle then overlap the straight edges until they form a cone shape.
Draw a circle on the sheet metal with a pencil compass.
Cut this circle out with your sheet metal shears.
Drill a few holes through the overlapping rectangular shape.
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How to bend a cone from sheet metal step 1.
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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.
I used aluminum sheet coil but you could use paper or any flat material.
Slice the circle.
How to make a cone and cone calculator.
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.
Here is one way to make a cone from flat stock.
Roll the cone template into a cone shape starting at the wide end working toward the pivot point end.
Place the tip of your marker.
How to roll a metal cone step 1.