The surface of gear housings is generally very rough and is only machined at the functional points. These finished surfaces must be measured accordingly. In addition to the flatness of the reference surface, the diameter and position of the bores are also required. Gear housings are also tested for voids. The tolerances range from approx. 20 µm to 50 µm. This means that the requirements for measurement uncertainty are in the medium range. While measurement time is considered, it is of secondary importance.
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