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A minimum radius of bend is specified for each type of aircraft sheet metal. The minimum bend radius is affected by the kind of material, thickness of the material, and temper condition of the material. Annealed sheet can be bent to a radius approximately equal to its thickness. Stainless steel and 2024-T3 aluminum alloy require a fairly large bend radius. 

## Bending a U-Channel 

To understand the process of making a sheet metal layout, the steps for determining the layout of a sample U-channel will be discussed. [Figure 4-123]  When using bend 

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