Abstract
The angular positioning error of the rotary stage causes low quality in milling various angles of a workpiece. This study proposes a solution that could improve these issues by using our Laser R-test for angular positioning calibration and compensation of the five-axis machine tools in compliance with the simultaneous measurement path of ISO regulations: ISO 10791-6 and ISO 230-2. System uncertainty analysis and calibration were implemented for system prediction. The measurement method proposed in this paper could solve concentricity problems between measurement devices and the rotary table by applying the Cosine theorem with a Cartesian coordinate system. Further, we used the commercial instrument XR20-W (Renishaw, UK) rotary axis calibrator to verify and compare the measured results on a CNC machine tool. The applied system achieves an angular error of 0.0121 degrees for actual workpieces and is smaller than the referring commercial system, which achieves an error of about 0.0022 degrees. The system in this research is useful for five-axis machine tool full calibrations.
Highlights
The machine tool used in this paper is aa B-TypeIn 2018, Ch. Bao [17] mentioned an instrument that could measure all the motion errors of a rotary axis, but in machining, translational and rotary components are in synchrony motions
The measurement system was for angular positioning calibration and compensation of the five-axis machine tools
The uncertainties of the system are confirmed by using the Laser R-test and attempting to improve the angular error of rotary axes through compensations
Summary
In 2018, Ch. Bao [17] mentioned an instrument that could measure all the motion errors of a rotary axis, but in machining, translational and rotary components are in synchrony motions. Bao [17] mentioned an instrument that could measure all the motion errors of a rotary axis, but in machining, translational and rotary components are in synchrony motions Influences under this point will affect the result in reality. In order to reduce the errors as much as possible, we improve the accuracy of translational axes and rotary axes by measuring the values of error and the accuracy of translational axes and rotary axes by measuring the values of error and compensating them to the corresponding axis.
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