R-test analysis software for error calibration of five-axis machine tools
-- Application to a five-axis machine tool with a tilting rotary table --
Soichi Ibaraki, Yu Nagai, Hisashi Otsubo, Yasutaka Sakai, Shigeki Morimoto
Abstract
The R-test instrument measures the three-dimensional displacement of a precision sphere, attached to a machine spindle, relative to a work table by using three displacement sensors. Its application to error calibration for five-axis machine tools has been long studied. This paper presents software to analyze measured R-test trajectories for error diagnosis and numerical compensation of location errors and error motions of rotary axes. The developed software first graphically presents measured R-test trajectories to help a user to intuitively understand rotary axis error motions. It also numerically parameterize rotary axis geometric error parameters, and then generates their compensation table to be implemented in some latest commercial CNC systems. Experimental demonstration of its application to a five-axis machine tool with a tilting rotary table (two rotary axes in the work table side) is presented.
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