For medium-sized external cylindrical grinding machines, the total hydrostatic spindle unit stiffness J should reach of 300–500 N/μm . Experiment results pointed out that, with viscosity of 2 mPas, the stiffness of a whole hydrostatic spindle is in a range of 300–500 N/μm. So, the oil viscosity of 2 mPas should be the most feasible for ...
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