1. Introduction Gears are one of the most common used machine elements. The wear of gears is highly dependent on the loads, speed and environment it experiences during its life cycle [1]. The geometric changes in the gears due to wear result in a transmission error, which in turn leads to additional transmission losses and noise [2,3,4]. If the machine is not properly maintained, this wear can cause gear failure, a loss of function and further damage to the machine [3].
