Trying to build a rx hydraulic excavator but I noticed that hydraulic cylinders cost 10 times more than pneumatic ones!

Trying to build a rx hydraulic excavator but I noticed that hydraulic cylinders cost 10 times more than pneumatic ones! That’s too much for me

Can I convert a stainless steel pneumatic cylinder to hydrolic, ot need to be able to have a push/pull force of around 20kg

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  1. 11 months ago
    Anonymous

    There's a few vids on youtube of 3rd worlders making toy hydraulic cylinders with junk. They seem pretty powerful, one guy made a bucket loader I think that was powerful enough to lift him

  2. 11 months ago
    Anonymous

    Maybe I'm moronic, but I think as long as you stay in the pressure ranges of the cylinder, you can run them with oil, provided the oil is compatible with the seals and tubing.

    • 11 months ago
      Anonymous

      Most are rated under 1mpa but I don’t know if using oil instead of air would provide better seal and allow higher pressure

      • 11 months ago
        Anonymous

        I think I've seen somebody do this once and it involved drilling out the holes a little bigger to improve flow. It could only go up to about 1/10th of real hydraulic pressures but still lifted like 50 lbs

        • 11 months ago
          Anonymous

          Sounds good enough to me what was the cylinder size he used ?

          • 11 months ago
            Anonymous

            A small one sized for a (large) remote control toy. Maybe like 3/4 inch diameter I guess? Been a while since I saw it

      • 11 months ago
        Anonymous

        most pneumatics are made for 6-8 bar, since thats what gear runs on.
        i think before you blow a seal you will deform the barrel, only one way to find out how overbuild these toy cylinders are. put them in a box and stresstest em.
        what kinda pump are you planing for?

        • 11 months ago
          Anonymous

          One of those 12 hydraulic pump for trailers

          • 11 months ago
            Anonymous

            Don't risk somebody's life on a homemade rig that if fails could crush a hand or worse.

            • 11 months ago
              Anonymous

              I’m pretty sure hydraulic pumps don’t explode as liquide is not compressible

              • 11 months ago
                Anonymous

                lol, lmao
                you are sounding like a darwin award contender

  3. 11 months ago
    Anonymous

    Just buy a used cylinder or a wrecked piece of equipment to pillage. Getting an injection of hydraulic oil is not something you want to mess with. I don’t think pneumatic cylinders are rated for the same pressure generally.

  4. 11 months ago
    Anonymous

    Remember when messing with hydraulics if you start loosening a bolt or a screw and it doesn’t start immediately getting easier to loosen stop and think about what you’re doing.

  5. 11 months ago
    Anonymous

    Tolerances of 0.001mm on a lathe should be doable, but only if youre not a moronic gorilla Black person.

  6. 11 months ago
    Anonymous

    https://hydraulic-hobbies.com/products/16mm-cat-hydraulic-cylinders

  7. 11 months ago
    Anonymous

    When you can't even tell why you shouldn't then you would be much better off buying or renovate a escavator as suposed to build one. Don't try and remake something into something it was not intended to. Hydraulic's can kill you in more ways then you can ever immagine.

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