Some old notes
I was browsing around some of my files on the clock and figured I'd post some of the notes I took on the drive components. From my notes on 3/16/2011: Servos/motors: I thought about using stepper motors to drive the hands but gave up because the Arduino motor shield can only drive 3 steppers. I need 5. This is the model of sail winch servo I used: GWS Sail Winch Servo S125-1T. Most places have them for $20-30 each. After the fact, I think that steppers would be possible with the Arduino using some custom mux/demux circuits to select one of the multiple steppers to drive and an external driver board like this one: http://www.sparkfun.com/products/10267 The mux/demux circuit could use this chip: http://search.digikey.com/us/en/products/HEF4051BP,652/568-1689-5-ND/763293 Gears: I used these two types of gears: A 1T 2-Y32048 from https://sdp-si.com/index.asp drive gear on servo: 48 pitch, 96 teeth, 2" pitch dia hand shaft gear: 48 pitch, 72 teeth,