What is the formula for calculating setback in bending?

Setback in bending refers to the distance from the bend line to the edge of the part after the bending process is complete. This calculation is crucial for accurately designing components that will be formed into specific shapes, ensuring that the material fits properly after bending.

The correct formula, which is represented by the selected choice, effectively captures the relationship between the bend radius (BR), the material thickness (T), and the constant that accounts for the specific bending process (K). In this formula, K is a factor that adjusts for various manufacturing conditions and material behaviors during bending.

By using SB = K(BR + T), you can calculate setback by first considering the sum of the bend radius and the material thickness, both of which impact the final geometry of the bent part. When this sum is multiplied by the K factor, it reflects how different bending techniques or material properties might influence the setback distance.

This formula is particularly useful in scenarios such as sheet metal bending, where accurate calculations are critical to maintaining the integrity of the final component's shape and ensuring that it fits correctly within the overall assembly or design specifications.

Understanding this relationship helps engineers and designers predict how a bend will affect the dimensions of a part and ensure that the final product meets both aesthetic and functional requirements