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  1. Tenaja

    Hydraulic servo valves--where to start?

    I have a different early 90's machine (probably designed in the 70's) where it pressurizes both sides to balance and control pressures. I guess I presumed that since valving and regulation technology has improved so much that it was an "old fashioned" way of doing things. (Experience with this...
  2. Tenaja

    Hydraulic servo valves--where to start?

    Is it reasonable to have electronic control over the hydraulic pressures as low as 15 psi? That's pretty close to what it would take to be able to get the 2" cylinder down to 40lbs max force. Thanks again.
  3. Tenaja

    Hydraulic servo valves--where to start?

    I have no doubt a hydraulic steering system will be plenty strong. I would be surprised if they have a suitably fast response time or sufficient precision though, because "real time" in a car controlled by human hands is vastly different than in a manufacturing machine controlled by a computer...
  4. Tenaja

    Hydraulic servo valves--where to start?

    Thanks, Peter! Are these things really $4k each? That is expensive.
  5. Tenaja

    Hydraulic servo valves--where to start?

    If Moog is expensive, then who are the affordable choices? Thanks for the link, btw, it was helpful. Seems like direct drive servo valves are fastest, and proportional and pilot are slowest. Is that about right? Unfortunately, the place I was referred to by my local supplier only deals with...
  6. Tenaja

    Hydraulic servo valves--where to start?

    Thanks for the notes, Peter. I've dealt with +/-10v and 0-20mA signals before, so that's easy. The plan was to install an external absolute encoder--probably something simple like a Gefran, because I don't need 1 mil accuracy. I'd welcome other thoughts. The air cylinder has a 3.15" (60mm)...
  7. Tenaja

    Hydraulic servo valves--where to start?

    Unfortunately, this machine preceded me, and as I said, it was originally designed with a pneumatic cylinder, so there is no room for a motor that can apply 1,000 lbs of force. OTOH, a hydraulic system will be a relative a drop-in fit. At about 1,000 lbs of force, with 6" per second travel, that...
  8. Tenaja

    Hydraulic servo valves--where to start?

    I want to convert a pneumatic cylinder to hydraulic, for more positive control. I need to tightly control the cylinder pressure and speed, which may vary at different points on the stroke depending on the needs at the time. It would be simple with a motor and screw, had it been designed that...

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