Determine the thickness of your sheet.
How to bend a rectangle out of sheet metal.
The bend allowance describes the length of the neutral axis between the bend lines or in other words the arc length of the bend.
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Your manufacturer may not be able to match dimensions when creating the actual sheet metal part due to tooling and equipment limitations.
Therefore the bend allowance added to the flange lengths is equal to the total flat.
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 your sheet metal is too thick you may need special machinery like a brake or a torch to bend your sheet into the desired shape.
Sheet metal cone calculator.
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You can use a tape measure or ruler to measure the thickness of your sheet metal.
The bend allowance and bend deduction are two measures that relate the bent length of a piece of sheet metal to the flat length.
It allows you to determine either the size of raw material needed or the number of gore sections to fit on your available material.