A machining test to identify rotary axis geometric errors on a five-axis machine tool with a swiveling rotary table for turning operations
Soichi Ibaraki, Ibuki Yoshida, Tetsushi Asano
Abstract
Lately, a cylindrical workpiece of relatively large diameter is often machined by turning
operations by a swiveling rotary table in a five-axis machining center. This paper
presents a machining test containing features finished by a turning operation by a
swiveling rotary table. Unlike conventional machining tests for turning operations
described in ISO 13041-6:2009, the present machining test can identify a complete set
of position and orientation errors of the axis average line of rotary axes from the
geometry of the finished test piece. The radial and axial error motions of the rotary
table can be also observed when the swiveling axis is positioned horizontal (A=0) and
vertical (A=-90). Experimental demonstration is presented. The rotary axis geometric
errors identified from the finished test piece's geometry are compared with those
estimated by a conventional error calibration test using a touch-triggered probe and a
precision sphere. The uncertainty analysis for the present machining test is also
presented.
Keywords: five-axis machine tool; machining test; turning; error calibration; geometric error
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