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Thread: how to build a hydraulic press?

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  1. #1

    Default how to build a hydraulic press?

    will be building a hydraulic press.
    using a hydraulic cylinder that i've acquired.
    it's from a back hoe boom
    the dimensions are 60" stroke 5" or 5.5" piston. and the rod is 2.75"
    i believe the machine had a working pressure of 2500 psi
    the Questions i have are
    what force will it produce at 2500 psi.
    second how heavy should the frame work be
    third i would like it to be a c frame

  2. #2

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    With a 5" piston, with pressure on the piston side it will develop 49087lbs (22 ton) of force at 2500psi
    If the piston is 5 1/2" it will be 59396lbs (26 ton) at 2500psi

    See http://www.engineeringtoolbox.com/hy...or-d_1369.html

    Chris
    Brisbane Australia.

  3. #3
    Join Date
    Feb 2010
    Posts
    408

    Default

    5.0" bore will make 49,087 pounds of force (Just under 25 tons)on the side opposite the piston rod.

    5.5" bore = 59,395 or just under 30 tons.

  4. #4
    Join Date
    Jan 2005
    Location
    Buffalo NY
    Posts
    2,084

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    The stroke is really too long to be useful, unless you want to pull broaches. Perhaps you could cut it down.

    --Doozer

  5. #5
    Join Date
    Jan 2010
    Location
    Palmdale,Ca.
    Posts
    106

    Default

    60 inch stroke??? Got something that needs to be pressed over in the next
    county?
    Seriously, you might want to consider a ram in the 15 to 20 inch range as
    hydraulic shifts will bend when side loading occurs which is easy to do in
    a press application( big bucks to get straightened also).
    Just a thought. Have fun and be safe.
    JIM : You don't get a 2nd chance to make a 1st impression.

  6. #6
    Join Date
    Feb 2007
    Posts
    2,078

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    I made a very effective press with a 50 ton bottle jack from Northern. It will put out enough force to coin things from silver the size of a 50 cent piece,if I press,anneal,and press again. I now have a 100 ton Enerpac,but need a separate pump and reservoir for it.
    Last edited by gwilson; 08-10-2010 at 10:03 AM.

  7. #7

    Default

    You can buy a pretty decent 20-ton press at Harbor Freight for less than $150. My friend got his for $137 by using a coupon off the website in conjunction with a 20%-off store coupon. You can't even start to buy the materials to build one for that money.

    http://www.harborfreight.com/20-ton-...ess-32879.html



    The plates shown in the ad aren't what comes with the press. His came with larger plates with several Vs in them. They're the ones shown in this ad.


  8. #8

    Default

    ok cutting it dn. to a 24" isn't a big deal. i am quite proficient in the welding field. i am certified in structural welding all position with 7018 ac rod and iron core mig. the reference was just an over statement on my part. the real question was and i most likely failed to articulate the metal requirement to build a adequate c frame and how much tonnage the piston will produce at my given pressure. i will build it as a c frame, i was just hoping for a consensus of sizes of the materiel required to build a sturdy unit.
    this is my thought. what do you guys think?

    1" plate cut down to a 6" cross section for the sides of the c frame
    for the inside and out side of the c frame i can have a shop role a1" X 6" flat bar
    and for the welding it is quite simple tack it together and then preheat it to 250 deg. F. with a good hard wood fire. and then lay the wire and wire to it.

    since i am not an engineer the overbuild it is my montra.

    i own all but the 1" sheet of metal. and hoses.
    pump, ram, control valve, drive motor 1 x 6 flat bar are all under control in my humble shed.

  9. #9
    Join Date
    Dec 2004
    Location
    where the Snake swallows the Salmon
    Posts
    793

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    Quote Originally Posted by wrenchbender
    how heavy should the frame work be
    third i would like it to be a c frame
    A c-frame will be springy.

    The design process will be fairly complicated for a c-frame. Several hours, if not days, engineering work.

    Do you really need a 60" stroke ? Because if not, you can buy a standard 20 ton press for less than you can build one.

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