Stuart Stevenson wrote: > I had two MHP machines. MHP = M(oog) H(ydra) P(oint) > They ran gcode just like any NC/CNC machine. Each linear axis had two > cylinders opposing one another. A hydraulic servo valve released pressure > from one or another cylinder to allow the table to move away from the high > pressure side. > The positioning was high resolution Heidenhain glass scales. > OK, that was a much later version. There was an original one that had a pneumatic encoder, holes in one plate lined up with tubes in another plate to encode position pneumatically. And, I'm pretty sure it wasn't able to execute G-code. Moog made a number of versions of the hydra-point control. > Large hydraulic pump beside the machine. > Very smooth, very accurate, howling, oily mess. > Yeah, hydraulics is certainly old-school. Inefficient, noisy and messy.
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