This pencil works on the principle of magnetic repulsion and spins forever.
It needs a pointed pencil though.
It works on the principle of magnetic repulsion.The magnetic field lines will oppse each others force and thus levitate the pencil.
Step 1: Adding the Magnet to the Pencil..
1.Insert a rubber ring followed by first ring magnet.
2.Slide it almost 3/4th length of the pencil
3.Slide another rubber ring.Place it close to the magnet.
4.Insert one more set of rubber ring and magnets.
Step 2: Materials Required
2.A soft board
3.six ring magnets
4.a plastic piece with dots
Step 3: THE FOAM..
1.Make three slits on the foam as illustrated in the image.
2.One slit on one side of the foam is smaller.Insert plastic strip vertically in this slit deep and form.
3.Make sure that the dots made on this strip and from foam side.
Step 4: The Two Magnets..
1.Insert the magnets in the foam in such a way that the front two magnets attract the front pencil magnet.
2.Insert the rear magnets in such a way that the rear magnets repel the rear pencil magnets as illustrated in the image.
In short,front magnets attract the front 2 magnets of foam and backside magnet of pencil repels backside magnets of the foam.
Step 5: Now Add the Slit and Pencil..
1.Now adjust positions of magnets in pencil.When pencil tip rests on acrylic strip,front magnet should be alighned little behind front magnets of the foam and back magnet must come exactly on top of the back side magnets on the foam.
2.Once done properly,pencil will levitate.Finally ,sharpen the pencil from backsede and spin it ..it will spin almost forever.
Step 6: Final
Now you have an amazing spinning pencil.Take care of the pointed edges.