90 Degree Bend Deduction Chart

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After bending, the actual size of the workpiece is inconsistent with the size of the flat pattern on the drawing.

This is because the external tension will stretch the sheet and the internal extrusion will compress the sheet.

The total flat length has increased, so it is necessary to calculate the value of the bend deduction.

The value of bend deduction is equal to the difference between the total flange length after bending and the total flat length.

In the previous article, we introduced the bend allowance calculation and the bend deduction calculation.

Bend allowance calculation formula:

Bend deduction calculation formula:

This calculation formula is a method to determine the flat pattern length of the sheet metal and the size of the workpiece.

You can also intuitively view different bending radii, bending angles, material thickness, and other parameters through the bending chart.

For example, if you have known the bend angle is 90 degrees, you can find the parameters you want for the 90-degree bend deduction chart.


The value of bend deduction can not only be calculated by a formula but also be calculated by the deduction chart.

To learn more about sheet metal bending, you can read the ADH website blog and find more helpful information and products.

The press brake of ADH has high performance and efficiency. If you need more information, you can contact our product experts.


What Is Bend Deduction and Bend Allowance?

How to Calculate Bend Deduction?

Bend Allowance Chart

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