Sheet Metal Flat Pattern Calculator

The bend allowance describes the length of the neutral axis between the bend lines or in other words the arc length of the bend.

Sheet metal flat pattern calculator.

You can use this sheet metal flat pattern calculator to calculate this increase in 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. You only have to insert interior angle flange lengths k factor inside radius and material thickness. For creating a cone from sheet metal or any flat material.

After bending the total length a b is larger than length l. Because a bend deduction can be measured in a physical part it is the most accurate way to calculate a material s stretch. The bend allowance is the amount of the neutral axis that bends. The flat pattern of a cone is an application that calculates the parameters for a development of a right oblique or truncated cone.

Cells on the right will output the desired values. The bend allowance and bend deduction are two measures that relate the bent length of a piece of sheet metal to the flat length. For example when sheet metal of length l is bend. Should be subtracted from the flat pattern so the formed part arrives at the desired dimensions.

In the example above it is indicated by a dashed blue line. Mathematically k factor value is equal to the ratio of position of neutral axis and sheet thickness. Therefore the bend allowance added to the flange lengths. K factor in sheet metal bending is a constant used to calculate sheet metal flat length or flat pattern.