Abstract

Path effect on a polished surface always matches tool motions and manifests as mid-spatial frequency (MSF) errors in magnetorheological jet polishing processing. To control the path effect, extended methods and part-constrained paths are presented in this paper. The extended methods, Zernike extension and Neighbor–Gerchberg extension, are developed for building an extended surface with a weak edge effect in simulation. Under the constraint of the pitch principle, the unicursal part-constrained path is presented to enhance the randomness of the tool path, including path turns and dwell-point positions. Experiments are executed to validate the effectiveness of these measures for diminishing MSF errors. The peak to valley and root mean square of the surface are improved from $0.220\lambda$ and $0.047\lambda$ ($\lambda =632.8\mathrm{nm}$) to $0.064\lambda$ and $0.007\lambda$, respectively, while simultaneously restricting the path effect.

© 2016 Optical Society of America

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