Here under the assembled steppermotor in action!

Details steppermotor:
– 12 steps per rotation
– 5V to 16V, designed for 10V
– Amps 0,24 free running with the opto
– RPM free running with the opto: 2500 (2 msec per step)
– the 20:1 gear with worm wheel gives 240 steps per rotation
– The GT2 12 for thooth belt give 0.1458 mm per step (35 mm per rotation and in ca. 0.5 sec)