Watch this video on YouTube. “Motor voltage: 24 VDC, 38 VDC (E-type). In my case, I used 12VDC power supply to the motor because this voltage level is compatible with L293D Motor Arduino Shield.

Although the stepper claimed to have a 1:64 reduction gear, the actual ratio wasn’t that precise ( [Rjeuch] estimates it as 1:63.876. The steps he took to fix this are worth a read.