Review on Gearbox NMRV 030 Speed Reducer Ratio Power Transmission Products by Brian Page

The holes for the NEMA 23 stepper motor were drilled in the wrong place. The distance between the motor bores should be 47 mm. The picture of this gearbox shows the hole spacing is 47mm, but the holes were drilled in increments of approximately 48.5mm. So there is no way to add a motor to this gearbox.