The machining effect of different materials electrodes (quenched steel electrode, stainless steel electrode, brass electrode and graphite electrode) and different electrorheological (ER) fluids on the glass was investigated by fine machining experiments using the ER effect instantaneous tiny grinding wheel. Quenched steel electrode and stainless steel electrode can cause bigger and deeper machining region and uniform material removal, while brass electrode and graphite electrode can lead to lower material removal efficiency and nonuniform material removal. The machining trace of zeolite ER fluid is more integrated and deeper apparently than that of SiO2 ER fluid. The processing mechanisms of ER fluid-assisted ultra-precision polishing are analyzed.

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