Dave wrote: > There were/are some manufacturers of hydraulic cylinder driven milling > machines. > > I forget who made them in the USA - Cincinnati Milacron perhaps. > > Cincinnatti made the machine, Moog made the control. The control was all pneumatic, no interpolation, not even linear. It used a wide paper tape where rows of holes defined the position, and the machine would move until a matching pattern of holes appeared in a plate on the machine slide. Awesome to do this with pneumatics, but really CRUDE. It was called the hydra-point.
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