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I have purchased 6 of these. They appear to be of good quality and finish. However there is an internal problem in the gearbox of all of them. I tested them all horizontally and they run remarkably well. However while each one was running I tilted them in every direction. If the moror is tilted to 30 degrees off vertical while it is running the gearbox will jam. The only way I could restart them is to reverse them in the horizontal position. This would indicate that at least two of the internal gears have no thrust control and actually float to interference. This does pose a problem for me in that it restricts the appplication of these units. If they are used horizontally only they should provide good service. If required for a vertical or variable aspect they are not reliable at all.
Verified purchase: Yes | Condition: New
Verified purchase: Yes | Condition: New
Great little stepper. Good torque.
Verified purchase: Yes | Condition: New