Hydraulic Arm by Live Science


Introduction: Hydraulic Arm by Live Science


The hydraulic arm is a simple machine; it’s a mechanical artifact that transforms a force that is being applied to another resulting force, modifying different magnitures (force, direction, length of movement or a combination of them).


Pascal’s law: Is a principle in fluid mechanics that states that a pressure change occurring anywhere in a confined, incompressible fluid is transmitted throughout the fluid such that the same change occurs everywhere. With this, we know that the pressure of exit-entry is going to be the same.


-STEP 1 • Assemble the small sticks and the rectangular chunks of cardboard to create joints; Make sure that the syringes can fit in between the cardboard chunks. In addition, use a small quadrangular piece of wood as a base. That's the basic structure of the arm.

-STEP 2 • Proceed to place the syringes in between the cardboard chunks with help of the bridles of plastic and the small sticks. The movements of the syringes are coordinated with the ones of the joints.

-STEP 3 • Construct the claw using the small ice cream sticks. Assemble the structure two times in opposite directions in order for them to work as the fingers of the claw. Use two wires to pull the fingers and it is joined by another syringe.

-STEP 4 • Assemble the rectangular base of wood. Introduce a small stick in the wood, it works as support of the hydraulic arm so that it can perform movements on its specific axis (axle).

-STEP 5 • Stick the small system of the small ice cream sticks directly to the base of the arm, with the syringe, so that when it gets stretched it does not overcome 180 degrees. In addition, insert four syringes (to control the arm)in the end of the base with the help of the U-shaped wires.

-STEP 6 • Connect the syringes with the hose and fill the system with water to finish the process. Now the hydraulic arm realizes the movements wished.


• The movement of the arm was obtained thanks to the syringes, since the syringes would come to be the joints of the hydraulic arm.

• If the hoses become obstructed with something such asair, the liquid will not be able to flow through the hoses. Because of this, thick materials shouldn’t be used, for example: oil, glycerin, etc.

• Since the syringes have the same height they exercise the same amount of pressure.



    • Creative Misuse Contest

      Creative Misuse Contest
    • Water Contest

      Water Contest
    • Clocks Contest

      Clocks Contest


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