holo clock

thingiverse

Human: update 2(2016/11/25) included printable spacers and a motor mount plate for 20mm npm motors update 1(2015/2/6): added an assembly sequence sheet This is a basic clock driven by a single geared stepper motor found in surplus for $10 each. The motor is essentially a 1:30 geared motor running at 12 volts with a 3mm shaft. One single motor is powered by a tiny2313 and l293dd circuit with coded instructions written in arduino ide. A single gear train drives the minute ring and hour ring as the attiny pulses the motor every minute to move the minute wheel and hour wheel. You can purchase this clock at: https://www.tindie.com/products/ekaggrat/holo-clock-2/ https://www.youtube.com/watch?v=1EtiEFQ4Aqg Instructions Print all the parts at a minimum layer height of 0.2mm bolts: m3 x 45mm: 4 m3 x 25 mm: 2 m3 x 22 mm: 1 m3 x 10 grub screw for motor gear m3 nut x 7 for npm motor (optional): m2 x 10: 2 m2 nuts: 2 for bj25 / bj20 motor: m3 x 15 self-tapping screws: 2 Use pcb spacers or cut brass/copper tubing to fit. Outer diameter is 4.5 mm with an inner diameter of 3.5mm and a length of: 12mm: 2 pieces 8.5.mm: 4 pieces 6.5.mm: 2 pieces Any stepper motor can be used, provided it's a bipolar or unipolar, 20mm or 25mm diameter, geared more than 1:10 ratio.