The Gearbox That Reversed Into Position: Backlash and Positioning Accuracy A rotary actuator with a gearbox. It oscillates (rotates back and forth). The position accuracy was off by 2 degrees. The customer thought the motor was losing steps. The motor was fine. The gearbox backlash was 1.5 degrees. The oscillation (reversing direction) amplified the backlash. …

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