What is the primary function of the drill stop in the drilling process?

The primary function of the drill stop is to prevent the drill bit from penetrating too deeply into the workpiece. This is essential in maintaining the integrity of the material being drilled and ensuring that the hole is of the desired depth, which is critical for achieving the correct fit and functionality in aerospace assembly. Drill stops can be set to specific depths, providing a reliable way to consistently create holes that meet engineering specifications and tolerances. This is particularly important in aerospace applications, where precision is paramount.

Additionally, while other options like creating a reference for hole size or ensuring the secure attachment of the drill bit can be important in their own right, they do not capture the main purpose of a drill stop. The concern regarding drill motor wear relates more to the choice of drill type and material rather than the depth control function served by a drill stop.