Create a working electromagnetic crane using craft sticks, copper wire, batteries, and a homemade electromagnet. This fun STEM engineering project demonstrates electromagnetism, switching magnetic fields ON and OFF, simple machine design, and rotating crane mechanics while lifting paper clips like a real industrial magnetic lifter.
Difficulty Level: Medium
Concepts: Engineering, Electromagnetic Induction, Magnetism, Electromagnet
Materials List
- 2 large craft sticks or popsicle sticks
- Metal sewing machine spool (metallic inner spool)
- 28 or 30 AWG insulated copper wire
- 3 AA batteries
- Battery holder
- On/off switch
- Electrical wires
- Cardboard base
- Plastic bottle cap
- Small nail
- Thumb pin
- Paper clips
- Hot glue gun
- Glue sticks
- Scissors or cutter
Steps
- Build the crane arm
- Take one craft stick as the main crane arm.
- Cut small connector pieces from another stick.
- Create an elbow joint by placing the main stick between the smaller pieces.
- Secure the joint using a thumb pin so the arm can move slightly.
- Create the rotating turret
- Punch a small nail through the center of the bottle cap.
- This bottle cap acts like a rotating turret for the crane.
- Fix the crane arm assembly onto the bottle cap using hot glue.
- Attach the turret to the cardboard base.
- Make the electromagnet
- Wrap insulated copper wire around the metallic sewing machine spool many times.
- Leave wire ends exposed for battery connections.
- This becomes the magnetic lifting head.
- Attach the electromagnet
- Hang the electromagnet from the crane arm using wire or thread.
- Make sure it hangs freely like a real crane hook.
- Connect the electrical circuit
- Connect:
- Battery holder
- Switch
- Electromagnet
- using electrical wires.
- Connect:
- Test the crane
- Turn ON the switch.
- The electromagnet should attract and lift paper clips.
- Rotate the crane arm and move the clips from one plate or container to another. ⚡
- Turn OFF the magnet
- Switch OFF the power.
- The paper clips should drop automatically.
Science Behind It
This project demonstrates electromagnetism and simple mechanical engineering.
How the Electromagnet Works
When electricity flows through the copper wire coil:
- A magnetic field forms around the metal spool.
The metal core strengthens the magnetic field and temporarily becomes magnetic.
This creates an:
- Electromagnet ⚡
Why the Crane Can Pick Up Metal
Paper clips are made from magnetic metal.
When the electromagnet is switched ON:
- The magnetic field attracts the paper clips.
When switched OFF:
- The magnetic field disappears and the clips fall away.
This makes electromagnets extremely useful for lifting metal objects.
Real-World Connection
Electromagnetic cranes are used in:
- Scrapyards
- Factories
- Recycling centers
- Shipyards
They can lift heavy metal objects and release them instantly by switching electricity ON or OFF.
Simple Machine Engineering
This project also demonstrates:
- Rotating turret movement
- Lever arm mechanics
- Load lifting systems
The crane arm acts like a simple lever, helping move objects more easily.
Experiment Ideas 🧪
- Add more wire turns and compare strength
- Test different battery counts
- Try lifting larger metal objects
- Build a taller crane tower
- Measure maximum lifting capacity
- Reverse battery connections and test polarity
Safety Notes
- Do not leave the electromagnet connected for long periods.
- The wire and batteries may become warm.
- Use scissors and hot glue carefully with adult supervision.
- Keep small metal parts away from young children.
Watch the video!
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