Step drills can be used, for example, to produce a through hole, a small blind hole and a chamfer in a single machining step. The drill tip geometry depends on the material in which the bore is to be made. In addition to the drill tip geometry, the diameters of all steps, the core run, the taper, step lengths and step angles are measured. Depending on the drill application, the tolerances vary in the range from 5 µm to 20 µm and therefore require a low to very low measurement uncertainty. While measurement time is considered, it is of secondary importance.
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