An interesting Arduino project has been published to the Instructables website showing how an Arduino CNC shield and controller has been used to create an awesome 3 axis Arduino CNC plotter.

An Arduino is used to determine the servo’s current position versus the desired position, and it turns the motor accordingly with a BTS7960 motor driver. The result is a sizeable and capable ...

Enter [James Bruton] and his DIY RC servo from a windscreen wiper motor. Windscreen wiper motors ... analog circuitry found inside a servo, an Arduino provides the brains. This means PID control ...