A new approach for holistic thread profile determination supported by optical focus variation measurements

Ullmann, Vinzenz; Meß, Torsten GND; Wenzel, Kay; Machleidt, Torsten; Manske, Eberhard GND

In this proceeding a new approach for the description of geometric-real threads will be given. The holistic determination of the virtual pitch diameter depends on the whole thread scanning. For this purpose, the optical focus variation system, consisting of a microscope objective and a digital camera, captures a stack of pictures and reconstructs the thread surface by a contrast analysis between neighbored pixels. A special calibration gauge for the focus variation system was designed and tested. The traceability and the measurement uncertainty for 3D-Points in precision thread gauge measurements will be given. The uncertainty in the current measurement setup is < 0.6 μm in each coordinate direction (x, y, z) for a S11.2 thread.

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Zitierform:

Ullmann, Vinzenz / Meß, Torsten / Wenzel, Kay / et al: A new approach for holistic thread profile determination supported by optical focus variation measurements. Ilmenau 2017.

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