Review on 51 Planetary Gearbox Stepper Precision by Johnny Pigao

It's 50:1 (well, if you want to be a parts expert, it's 51:1) The NEMA 17 gearbox works as advertised. My project needed more torque than speed and that helped. In general I am very satisfied. However, this device has several functions. First, it's quite heavy, much larger than the engine itself. I was surprised (maybe I shouldn't have, but I was). Second, as another reader pointed out, the mounting holes do NOT conform to the standard NEMA 17 design. Read the user manual/spec before final design. I do not consider points (1) or (2) to be incorrect. Third, the motor is hardwired rather than a detachable wiring harness. A small minus. Fourth, there is a slight play / game, but the device is normal. For this price, the performance is more than satisfactory. Overall I'm satisfied and will definitely buy again if I need a geared stepper motor.