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Your comments, feedback and suggestions: I can improve on the definition for 'Gears : Zero Backlash Planetary Gear': A planetary gear system consists of at least one outer gear that “orbits” around a central gear of an epicyclic train. When a planetary gear system is considered to have zero backlash it does not have any free room in the mated gear teeth. A tooth and a tooth slot are perfectly matched to each other.

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