Gear Technology Magazine
www.geartechnology.com/articles/20186-gear-tooth-scoring-design-considerations-for-spur-and-helical-gearing

Gear Tooth Scoring Design Considerations for Spur and Helical Gearing

May 1, 1985
High speed gearing, operating with low viscosity lubricants, is prone to a failure mode called scoring. In contrast to the classic failure modes, pitting and breakage, which generally take time to develop, scoring occurs early in the operation of a gear set and can be the limiting factor in the gear's power capability.