What is one thing that the step drill accomplishes?

The step drill is specifically designed to create holes of varying diameters in a single drilling action. By utilizing a conical flute shape, it allows the user to drill multiple sizes without needing to change bits, which inherently contributes to the accuracy of the hole diameter. The step drill's design enables it to achieve precise measurements, particularly when the drill bit is properly aligned and controlled during the drilling process. Accurate hole diameters are critical in aerospace applications where tight tolerances are essential for assembly and structural integrity, ensuring components fit together as designed.

While step drills may provide some benefits related to speed or efficiency, their primary purpose is enhancing the accuracy of the diameter during the drilling operation.