Viesturs La-cis wrote: > if that is just a base for machine, I suspect that the machine itself > also will be very massive and very heavy to provide for rigidity and > vibration damping in order to achieve the high precision in > hard-to-machine materials. so the question is - what kind of > bearings/slides are there to be used and what kind of actuators are to > be used for such a machine? the same old Hiwin rails, but 3 or 4 > instead of one and same old ballscrews with some extreme 10" diameter? > Some of the very large machines are hydrostatic. They look very much like conventional box ways, but have an oil port in the center, and and a hydraulic pump provides a steady flow of oil to the bearing pad. There is usually some scheme of bladders or wipers and a scavenge pump to return the oil to the lube system. Stuart Stevenson at MPM has a Gidding and Lewis horizontal boring mill like that, I think the table is about 50 feet long.
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