Thread inspection using the WAVELINE W800R profilometer: methodology for method verification

The subject matter of the study is the thread inspection method using the WAVELINE W800R profilometer and its verification. This includes determining the accuracy parameters of the calibration method and confirming its suitability for practical application. The aim of the work is to investigate and evaluate the suitability of a thread gauge calibration method using the WAVELINE W800R profilometer based on an analysis of measurement precision, reproducibility, and accuracy. The tasks include: the development and application of an evaluation algorithm for the calibration method; determination of key metrological characteristics affecting measurement accuracy; assessment of the method’s repeatability and within-laboratory reproducibility; analysis of the method’s stability under the influence of various factors; and determination of measurement accuracy using a comparison coefficient. The methods used involve experimental studies of the calibration method’s accuracy with the application of statistical tests (Cochran, Grubbs, Fisher, and Student's t-test) to verify variance homogeneity and exclude outliers. Multiple repeated measurements of thread parameters were carried out, along with an analysis of the influence of external factors and a comparison of results using the k-criterion. The results confirmed the feasibility of using the WAVELINE W800R profilometer for high-precision measurement of thread gauges. The method demonstrated sufficient repeatability and within-laboratory reproducibility. The conducted analysis of the method’s stability under varying environmental conditions confirmed its robustness. The method passed the accuracy verification using the comparison coefficient and complies with metrological control requirements. Conclusions: the thread inspection method using the WAVELINE W800R profilometer has proven suitable for laboratory use; it can be implemented in metrological practice for the control of thread gauges. At the same time, it was established that the verification process is time-consuming, which should be considered when organizing calibration activities. It is recommended to perform re-verification of the method after the calibration of reference equipment.