When using a scale to mark fastener locations, where should the scale's inch marking align?

When marking fastener locations with a scale, the proper alignment of the scale's inch marking is crucial for accuracy. The scale should be placed in such a way that the 1 inch marking aligns with the reference point or edge you are measuring from. This alignment ensures that the first inch of measurement is taken into account properly, placing the fastener correctly in relation to your design specifications.

Using the 1 inch marking allows for the measurement increments to start from that point, leading to more precise placement of fasteners, especially if the design calls for locations specified at distances measured from edges or other critical points. Precision in fastener placement is vital for structural integrity and proper assembly in aerospace applications.

In contrast, aligning the 0 inch marking would not measure accurately from your reference point if you need to account for that distance. Aligning with higher inch markings would also lead to incorrect placement, as it would increase the distance measured from the intended reference point rather than starting the measurement from the first full inch. Thus, aligning with the 1 inch marking provides the most accurate foundation for marking fastener locations.