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How to fabricate a hydraulic jack

Updated on October 27, 2008

How hydraulic jack works

The first step in designing and fabricating a hydraulic jack is to understand how a hydraulic jack works. If you already know how a hydraulic jack works you can skip this section.

Hydraulic jacks work on Pascal's law which states that "a change in the pressure of an enclosed incompressible fluid is conveyed undiminished to every part of the fluid and to the surfaces of its container."

Let A1 be the area of larger piston and A2 be the area of smaller piston of a hydraulic jack, while p1 and p2 are the pressures applied on the larger and smaller pistons respectively. In equation form:

In above equation you can easily see that the force F1 is the product of two terms: F2 and A1/A2. We can get force of F1 on the the piston 1by either having a large F2 and small A1/A2 or a large A1/A2 and small F2. The latter case is what is done in case of hydraulic jack.

Lets try to understand it with the help of an example.

Suppose we want to lift a weight of 300 lbs (i.e. F1 = 300) and if we use an area ratio of 3 ( A1/A2 = 3) we will need to apply a force of only 100 lbs at piston 2 ( 300/3 = 100).

Fabrication of hydraulic jack

The following drawing shows the basic idea of things that will be needed to make a hydraulic jack. Note that this is not a drawing of a real hydraulic jack. It simply shows which parts are needed and where they are needed:

We will need the following things:

  • Two cylinders

  • Seals
  • Oil
  • Pistons
  • Non-return valve
  • Pipe

At the outset I would like to clarify that junkyard would be the best place to find the above-mentioned parts.

Moreover choose the maximum load that you will be lifitng with your hydraulic jack. Then choose the area ratio.

Cylinders

They will be filled with the oil that's going to transmit force. You can either choose cylinders of an engine or heavy PVC pipe depending upon the forces involved. The selection of cylinders depends on the chosen area ratio. You will probably never get exactly your desired area ratio but you can get closer if you search the cylinders in

junkyard. Using PVC pipes as cylinders would give you much more flexibility as they are available in various standard sizes.

Pistons

They will be used to transmit the applied force to oil and from oil to the load that needs to be lifted.

Oil

Oil will be the fluid that's going to transmit force. Lubricating oil used for car engines can be used.

Seals

Seals will be required to seal the gap between piston and cylinder.

Non-return valve

When using a conventional jack you must have observed that it is used by applying force for a small amount of time and you keep doing it till the load is completely lifted. For this to happen, you will need a non-return valve.

Pipe

A flexible pipe would connect the two cylinders

Conclusion

Search all the above-mentioned things in junkyard. You will surely find suitable materials to complete your hydraulic jack.

Good Luck!

What are you waiting for? Head to your nearest junkyard. You can turn the junk into something useful.
What are you waiting for? Head to your nearest junkyard. You can turn the junk into something useful.

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      harrison peter. 7 months ago

      Please! Send me afull details on how to make ahydraulic jack step by step. Thank you. Peter.harrisen@gmail.com

    • profile image

      PETER MATHEW 8 months ago

      Please! Send me full details on how to make a hydraulic jack step by step.

      petermubiligi@gmail.com

    • profile image

      steve ewhe 2 years ago

      please im currently working on automated hydraulic press for compressing earthbricks can u please send details and diagrams of the hydraulic jacs to steve316xp@gmail.com.

      thak you very much

    • profile image

      selvakumar 2 years ago

      Hi. i want more details of hydraulic jack and any related videos please send this id:ajithselva96.hihi@gmail.com

    • profile image

      Er.A.GUNA SEKARAN 4 years ago

      EXPLAIN THE RELATIONSHIP BETWEEN TORQUE & SHEAR FORCE

      FROM JSRGI

    • profile image

      ashok 4 years ago

      THANK YOU

    • profile image

      sukriti 4 years ago

      i need the materials required

    • profile image

      sharad sharma 5 years ago

      i need a ppt on automatic hydraulic jack

      so plz send my id sathisharma2008@gmail.com

    • profile image

      Eva 5 years ago

      If you (or someone in these comments) can send me the details for making the hy. jack, that would be awesome! Really interested in how you impose the pressure? And how you'll connect the pump etc. Details for the whole thing please!

      eva_ik@hotmail.com

    • profile image

      franciseffah26@yahoo.com 5 years ago

      dateil of design calculation, meatrial selection and type of maintenance fo hydraulic car jack

    • profile image

      sahil 5 years ago

      plz tel all detials how we make as in a project

    • profile image

      raj 5 years ago

      i want how to build the hy.jack

    • profile image

      Amit kumar singh 5 years ago

      My final year project is motorized hydraulic jack so need all the details about motorized hydraulic jack .Plz help me

      my id is amitcrajput@gmail.com

    • profile image

      p.nagaraju 5 years ago

      please i need alll the detall on how to fabricate an hydraulic jack

    • profile image

      kau 5 years ago

      i wants info. about how to construct it with procedure....plz help

      my id....kaustubhb4@gmail.com

    • profile image

      Garage Tools 6 years ago

      Informational, but there's no instructions on how to build a jack with the materials

    • profile image

      akhila 6 years ago

      the information is better u can add up more

    • profile image

      sameer 7 years ago

      hi buddy ....can u plz send the whole details of making hydraulic jack

      thanks

      sameer

    • profile image

      Musa 7 years ago

      Informational, but there's no instructions on how to build a jack with the materials

    • profile image

      Dominic 7 years ago

      nice work!! but i did not clearly understand the whole diagram........ pls make it more neat

    • profile image

      suhaimi 7 years ago

      interesting - but could u pls upload the complete fabricated sample of these task.

      how do u imposed the pressure? a pump shall be required and how they are connected. appreciate yr next steps and great articles

    • profile image

      hiren gajera 7 years ago

      im doing aproject on motorised hydraulic jack

      plse give me full details of fabrication of above or recommend some addreses where i can get yhe details

      my email id

      shagird1_atif2rediffmail.com

    • profile image

      manish thukral 7 years ago

      hey can u give me all the complete detall about the hydraulic jack or u can mail me on "hellboy.thukral@gmail.com"

      I'm waiting for ur rpy..!!!!!!!!!!!!!!1

    • profile image

      pastorjite 7 years ago

      please i need all the detall on how to fabricate an hydraulic jack

    • profile image

      pastorjite 7 years ago

      please i need alll the detall on how to fabricate an hyraulic jack

    • profile image

      pastorjite 7 years ago

      please i need alll the detall on how to fabricate a hydraulic jack