The delimitation of the workspace accuracy in coordinate measuring technique

Abstract

Dimensional measurements based on coordinate metrology are widely used for product verification, process control and dimensional faults root causes diagnostics of various manufacturing processes. In this study, the results of the measuring surface scanning of coordinate measuring machine with the prototype of optoelectronic device have been presented. The presented device is able to determine actual (real) inaccuracy of the CMM in two axes (X, Y). The prototype scanning device is installed in the measuring probe place. The method makes possible scanning with the established accuracy (max. 0.1 µm). A short description of the new method and the device is added, and some initial results are discussed. The results concern the inaccuracy of the CMMs example measuring area.

Mapping and correction of the CMM workspace error with the use of an electronic gyroscope and neural networks—practical application

“…In order to put the proposed solution into widespread use, a number of significant changes have been introduced. First of all, the conception of the CMM error‐correcting procedure (Swornowski, ) has been altered. The most significant change was relying on the results of the “classic” acceptance and reverification tests performed in accordance with the ISO 10360–2 standard (ISO, ).…”

“…(B)) was constructed, in which the Renishaw joint system was reproduced. The merit of this solution is the rigid connection of the PS‐20 device with the CMM (similarly as in the first project [Swornowski, ]), enabling to determine the CMM errors explicitly, which is the basis for the corrective actions. Certain data distortions occurring in the probing system presented in Figure (C) can be entirely compensated on the basis of the reference result (PAA1; Fig.…”

“…Correction data are collected using the ADXRS401 electronic gyroscope, produced by Analog Devices in the MEMS (micro electromechanical systems) technology. This device was already tested by the author in the first solution (Swornowski, ). The device measures the angular rate Ω z , based on the measurement of the Coriolis force F c .…”

“…Therefore, the measured values of Ω zm ( ≅z 0 ( t )) can be used to determine the dislocations along the axes X and Y In this way, it is possible to determine the correction of the real position of a point in three axes. Remember that the real position of the point is influenced by the 21 geometrical errors of CMM (Swornowski, ) (Fig. (B)).…”

“…This text presents an attempt to use the author's method for correction CMM errors in commercial applications. The quasi‐practical method (with PS‐2 device) was presented in detail in Swornowski (). Basically, it consisted on mapping of the CMM errors.…”