A new technology for static and dynamic calibration of angle errors in multi-axis rotary tables

Le résumé fourni par la source

Abstract The traditional approach for calibrating the angular position error of a rotary table involves employing an autocollimator coupled with a polygon mirror, or alternatively, utilizing an interferometer coupled with a precision wireless rotary table equipped with a mirror. These approachs require that the standard polygon mirror or standard rotary table be concentric or coaxial with the rotary table being calibrated, so that the angular position of the rotary table can be compared with the standard angle. However, with the widespread application of multi-axis CNC machine tools, which typically consist of multi-axis rotary tables and linear platforms, the centerline of the rotary axis is not parallel to the normal direction of the worktable surface, making the conventional method for calibrating the angular position error of the rotary table inapplicable. This paper develops an optical gyroscope goniometer based on the Sagnac principle to achieve high-accuracy angular position at any position on site. Laboratory and online measurement results, indicate that the angular position error is better than ±0.3'', and the repeatability is better than 0.2'', which can meet the calibration requirements for angular position errors of CNC rotary tables in CNC machine tools.

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