Calibration of biaxial NC positioning table

Abstract

This contribution describes procedures and interpretation techniques of calibration biaxial positioning table carried out in the Institution of automatization, measurement and applied informatics STU in Bratislava. Characteristics of table axes, which is installed as a part of information and control system laboratory are demonstrated by calibration. As method for calibration was used direct comparison method. The Aim of this work is to specify a calibration method, design of measurement model, execution of the measurement experiments, statistical evaluation of the measurements, specification of source of uncertainties and interpretation of the results of calibration in terms of the chosen methodology. As a standard was chosen laser interferometer XL 80 from Renishaw to fulfill requirements for high accuracy and repeatability measurements of NC table axes. Laser interferometer is used in the geometrical quantities measurement such as length, angle, straightness, flatness or perpendicularity. Advantage of this standard is the software, which allows evaluation of measurement according to ISO standards and the others. As a result of this work is to determine the positioning errors of NC table with application of corrections of these errors. Finally is made positioning control of table axes by re-execution of the measuring experiments.