What does the term "setback" refer to in aircraft bending?

The term "setback" in aircraft bending specifically refers to the distance from the mold point to the bend tangent lines. This distance is critical in bending operations as it determines how much material is needed to create the desired bend, ensuring that the resultant shape of the material matches precise specifications. Understanding setback is essential for producing components that fit accurately within the overall design of the aircraft.

In practical terms, the setback measurement affects the geometry of the bent part, since it directly relates to the angle and curvature created during the bending process. By accurately calculating and applying the setback, manufacturers can avoid issues like deformation or misalignment that would negatively impact the performance and safety of the aircraft.