Faller First World's Biggest Cuckoo Clock 130389
This model is based on a real 50x scale Cuckoo Clock in Schonach, Germany
The gear that turns the water wheel also turns the rachet which will move the lever that will be connected to the woodcutter's arm.
The clock is battery operated.
The cuckoo sound & mechanism, waterwheel and woodcutter will all be powered by a 16vAC motor.
The circuit board receives a signal from the battery operated clock "on the hour" to start the motor.
The cuckoo only sounds 4 times, regardless of the current time.
A button on the base (lower right) allows the mechanism to be activated at any time.
Here's brief video showing the Cuckoo Clock operating: