Arch Ball Clock

Featured in the July 2009 issue of Nuts and Volts Magazine, the Arch Ball Clock uses two stepper motors to position the two inverted arches. One arch is for hours and another for minutes. Each arch has a steel ball bearing which is allowed to roll freely on the arch. As the motors turn the arch the ball bearing rolls to the lowest point on the arch - displaying the new time.

[Kit from Nuts and Volts Online store]

[Arch Ball Clock Templates Download]