INFLUENCE OF MEASUREMENT DATUM SELECTION ON METHODICAL MEASUREMENT ERROR

Glubokov Alexandr Vladimirovich, candidate of technical sciences, associate professor sub-department of measuring information systems and technologies, Moscow State Technological University «STANKIN» (1 Vadkovsky per., Moscow, Russia), al-glubokov@yandex.ru
Tveritnev Ilya Olegovich, postgraduate student, Moscow State Technological University «STANKIN» (1 Vadkovsky per., Moscow, Russia), il.rabota2017@yandex.ru

681.2.083

10.21685/2307-5538-2018-1-7

Background. The paper considers flatness errors measurement by means of coordinate method. The methodical error of data processing is subject of investigation, because it is the most significant among other error components. The paper considers boundaries of error caused by measurement datum selection.
Materials and methods. Either least squares reference or minimum zone reference planes is used as measurement datum. In order to build the planes both standard and original algorithms are used. The authors have developed original software in order to realize the algorithms mentioned above and compare them.
Results. The paper studies the dependence of methodical error on datum selection based on experimental data and modeling. The error boundaries were determined for all data available. The dependence between error value and position of measuring points was determined.
Conclusions. The paper concludes the methodical error in case of least squares reference plane used as datum is significant is increases error measurement results. This should be taken into consideration during actual measurement.

deviations from form, deviations from flatness, methodical errors, coordinate-measurement machine