Definitions:

Nn3 is narrow gauge in N scale, primarily, but not exclusively using Z scale standards to represent 3ft narrow gauge railroads.While it’s obviously a minority interest, it’s followed by an increasing number of modellers worldwide. N scale uses 9mm track. Z scale use 6.5mm. So, Nn3 is N scale rolling stock on Z scale track. In other words VERY small.

Stepper motors-The stepper motor is an electromagnetic device that converts digital pulses into mechanical shaft rotation. Advantages of step motors are low cost, high reliability, high torque at low speeds and a simple, rugged construction that operates in almost any environment.

Ok, you got your mind around that.

Here’s the stepper motor that is being used to operate the sawmill carriage of Joe DuViviers diorama of the Caspar mill:

Stepper motor alongside a penny

If that didn’t freak you out look at what it takes to control the little beast:

Stepper motor control board

That’s Joe’s finger in the pic. And, he did all the soldering.