Digital Crazy Hours and Minutes - WiFi Sync Clock

thingiverse

## Introducing a mechanical digital clock with numbers strangely arranged. ## Technical highlights * Usually, intermittent motion mechanism such as Geneva drive is necessary to decrease the number of the motors of mechanical digital clock. Contrary, this clock has a constant mesh (permanently engaged reduction gear) between tens and ones places of minute numbers. The ratio of the reduction gear is coprime (7 : 10) and 70 numbers can be shown by one motor. * The order of the numbers are not random but optimized to minimize the time to update. Average angle of rotation of the central rotor is less than 360 degrees. * To show the current time correctly when it is powered on, not only the WiFi connection capability but also origin finding mechanism are necessary. This clock has an one-way rotation blocking mechanism. The rotors for minutes are stopped at 00 when it moves backward, but pass through there when rotating forward. * Herringbone gears are used to hold the rotors without central axes. Note : This model needs large (30x30cm) 3D printer to make.