Intermethod industrial measurements as a basis for ISO/IEC 17025:2017 accreditation of testing laboratories
Mechanical Engineering
The introductory part of the bachelor’s thesis presented the set goals, purpose, and basic claims that had to be confirmed or rejected throughout the entire thesis. Modern measurement methods and the most modern standards used in metrology were used to verify the claims.
The use of the accreditation house guidelines and the implementation of international accreditation standards for individual measurement methods were very important. This was directly reflected in all measurements and activities in our accredited measurement laboratory.
A study of the accreditation house’s requirements and, consequently, the implementation in the production of the final model followed. The former dictated the course of the study of the design of the reference piece. This model served for the pre-agreed use of machining methods for the production of the reference piece on a modern CNC machining center.
The design of the reference piece also included a pre-selection of measurement methods. This was reflected in the planning and design and, ultimately, the production of the necessary measurement programs for each measurement method that ultimately served to obtain accreditation of measurement procedures.
The selection of measurement methods in this thesis was systematic and empirically oriented. Measurements in the laboratory showed that not every measured object is suitable for every method.
The measurement methods that were used in this bachelor’s thesis and that are also methods that are used daily in the laboratory are the 3D scanning methods with white structured light, computer-aided tomography, optical coordinate measuring machine, and, finally, the most widespread and researched method of using a coordinate measuring machine.
To finally achieve confirmation of the guidelines of the bachelor’s thesis, measurements were obtained for each measurement method. They were analyzed and eventually compared with each other. The key to obtaining a real picture of the measurements was the use and consideration of measurement uncertainties and measurement errors of each measurement method.
The results showed a picture of mutual deviations that were evaluated with the method of measurement errors. The conclusion of the analysis of mutual measurement methods showed the actual deviation of each measurement method, which ultimately ended with an indispensable inter-method comparative analysis of the results.
The results obtained served as a guide in proving certain hypotheses of this thesis.
