A new technique for volumetric error assessment of cnc machine tools incorporating the ball-bar measurement and the 3D volumetric error model

摘要

This paper presents an useful technique for assessing the volumetric errors in multiaxis machien tools using the kinematic double ball bar. This system has been developed based on the volumetric error model which describes the 3 dimensional errors of machine tools. The developed system inputs the measured radial data performed on the 3 orthogonal planes, analyzing the parametric errors such as positional, straightness, angular, squareness, and backlash errors. The developed system also can assess dynamic perofrmanceo f machine tools such as errors due to the servo gain mismatch. The developed system has been tested in a practical machine tool, and showed high potential for error assessment of multi-axis machine tools.