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  1. Mitchell21

    Hi folks, We're working on the d

    The cylinders are custom designed for this application. They have good overlap between rod and barrel at full extension, and plenty of bearing area on the wearbands.
  2. Mitchell21

    Hi folks, We're working on the d

    Thanks Oldhydroman. I appreciate your advice. I was thinking about sealed pilot pistons as the way to go. I'll make sure we have a way to bleed those pilot lines. I know that the piston seals we will use are very good at holding pressure. If they ever leaked enough to upset the control...
  3. Mitchell21

    Hi folks, We're working on the d

    Thanks for the replies. I appreciate the good suggestions. I agree that an open loop system will not give reliable performance. We are setting up a test system, so we will close the loop and try both the flow measurement and position measurement options. The rest of the system and the method...
  4. Mitchell21

    Hi folks, We're working on the d

    Thanks for your reply Oldhydroman. Sorry, I unintentionally misled when I mentioned it was an industrial application. It's actually a mobile application and each pump will be driven by a small 50cc internal combustion engine. We looked into DC motors for the HPU, but the electric-to-hydraulic...
  5. Mitchell21

    Hi folks, We're working on the d

    Hi folks, We're working on the design of a system that uses four hydraulic cylinders for lifting a payload. The cylinders stand on the ground and the payload is not otherwise guided. Because of the distance between the cylinders, they're not hydraulicaly coupled - each is driven by its own...
  6. Mitchell21

    Efficiency of DC motor + pump

    Thanks Wayne440 and LiteYear for your comments. I hadn't realised how inefficient these drives were...
  7. Mitchell21

    Efficiency of DC motor + pump

    I'm sizing a hydraulic pump and DC motor and I'm surprised about the electrical power in v's hydraulic power out I get in my calculation. I'd apperciate if someone could confirm if this is right. I have been given motor data at 24V DC: 4950 rpm using 6 Amps when 0 Nm torque 3150 rpm using 90...
  8. Mitchell21

    Power supply for mobile hydraulic system

    Thanks for the suggestions. The gas-powered chargers look good. I guess I wasn't searching with quite the right terms. There are actually several HPUs to power and I want to avoid the cost of an ICE for each, so that's why an ICE/hydraulic unit won't suit this application. The responses are...
  9. Mitchell21

    Power supply for mobile hydraulic system

    Hi guys - I'm looking for some comments / suggestions. We are designing a mobile hydraulic system that's used around trucks. The obvious power source to drive the hydraulic power unit (HPU) is the 24V DC supply on the truck, drawing max. 100 Amps. However there are cases when it might be...

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