The feasibility of mirror surface hydrodynamic polishing by using the ring shaped tool is studied. This novel polishing process is expected to apply to the precise fabrication of molds and optics. In order to reduce the tool wear effect, the semi-spherical tool is replaced by the ring shaped one. The experimental results show that the machining rate is not affected by the tool wear, that is, this new process provides excellent machining repeatability. On the other hand, the mirror surface with R_a 4.4 nm was yielded in the larger area polishing.
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