Mini stepper driven clock

thingiverse

This is a compact stepper-driven timepiece mechanism, devoid of a clock face. The files include some rudimentary hands, but it's better to add your own. I initially attempted [this clock](https://www.thingiverse.com/thing:2555644), but wanted to see if I could create something significantly smaller. This design measures 7cm X 6.5cm X 5cm (including the stepper motor). It utilizes brass tubing for bearings, ranging from 2mm to 5mm in size. In the end, I wrote some Python code that leverages SolidPython and Scad Gears 5.1 to handle the complex tasks. The base plate is designed for a 28BYJ-48 stepper motor, which I converted to bipolar mode and drive from a Raspberry Pi using a smart driver chip (TMC5130). The stepper drives an intermediate stage between the second hand and the minute hand, allowing the clock to almost run at 4 hours per minute. At normal speed, the stepper provides a slight tick to the movement of the second hand. [Python gearbox code](https://github.com/pootle/gearbox)