What is a bend line used for in the layout process?

A bend line is crucial in the layout process as it serves as a precise guideline for positioning metal in a brake. When working with sheet metal, accurately bending the material at designated angles is essential to achieving the desired shape and function of the part being fabricated. The bend line indicates where the metal should be bent, ensuring that the operation is performed at the correct location and angle, thus maintaining the integrity and specifications of the design.

This ensures that the final product aligns with engineering drawings and meets quality control standards. By following the bend line, mechanics can produce consistent and repeatable bends, which are fundamental for assembling components accurately, especially in the field of aviation, where precision is paramount.