Hunting Ratio for parallel axis, locked train reduction system

The advantage of a hunting tooth gear ratio design is that every tooth on the bull gear engages every tooth on the pinion. This makes it unnecessary to match mark the gears. In designs that are not of a hunting tooth arrangement, specific wear patterns develop because particular teeth on the pinion only engage with particular teeth on the bull gear. These gears are match marked because if they are not reassembled with exactly the same teeth engaged, the result is high wear and vibration.