Contribution of five-axis machine geometric errors and workpiece setup errors to on-machine laser scanning measurement
Soichi Ibaraki, Shunsuke Goto, Keisuke Tsuboi, Naoto Saito, Noriaki Kojima
Abstract
On-machine scanning measurement of workpiece geometry has a strong advantage in its efficiency, compared to conventional discrete measurement using a touch-trigger probe. When a workpiece is rotated and tilted, position and orientation errors in workpiece setup with respect to the machine's rotary axes can be a significant contributor to the measurement error. The machine's geometric errors also influence the measurement error. To establish the traceability of on-machine laser scanning measurement with workpiece rotation, this paper kinematically formulates their contribution to measured profiles. As a practical application example, this paper studies the sensitivity of workpiece setup errors and rotary axis geometric errors on the error in laser scanning measurement of an axis-symmetric part.
Keywords: On-machine measurement, five-axis machine tool, laser displacement sensor, geometric errors, kinematic model.
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