What role does a reference edge serve when laying out metal?

When laying out metal, the reference edge is primarily utilized as a starting point for accurate measurements and alignment. This edge serves as a guide for measuring horizontal line location, ensuring that components are laid out precisely according to design specifications.

By referencing a defined edge, a mechanic can establish where cutting, drilling, or bending needs to occur. It helps maintain consistent dimensions across the workpiece, contributing to uniformity and accuracy in fabrication. The importance of a reliable reference edge cannot be overstated, as it directly impacts the overall quality and fit of the final assembly.