Make: Easy 1+2+3 Projects

Two-Cent Wobbler

By George W. Hart

You will need

2 identical coins or other disk-shaped objects that a slot can be cut into, such as a CD

Dremel tool or saw to cut slots

NOTE: In some countries it is illegal to damage coins.

I recently returned home from Japan with some leftover coins and decided to make them into “wobblers.” Two orthogonally interlocked disks will roll together with an amusing left-right wiggle. If the spacing between the disks is just right, the wobbler’s center of gravity remains at a fixed height so it will wobble down the slightest incline. It is surprisingly addictive to roll these and race them, and you can’t ...