Minimum Backlash
Minimum backlash is the minimum transverse backlash at the operating pitch circle allowable when the gear tooth with the greatest allowable functional tooth thickness is in mesh with the pinion tooth having its greatest allowable functional tooth thickness, at the tightest allowable center distance, under static conditions.
Difference between the maximum and minimum backlash occurring in a whole revolution of the larger of a pair of mating gears.
Read more about this topic: Backlash (engineering)
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