From Sumitomo Machinery Corp. of America
This paper provides basic lubrication information for industrial gearbox oils and examples of specific recommendations for Sumitomo Drive Technologies (SDT) products. Basic properties, terms from specifications sheets, and maintenance information are also included.
The purpose of lubrication is to reduce friction, transfer heat from bearings and gears, remove dirt and contaminants and prevent wear. There are three basic lubrication regimes: hydrodynamic, boundary, and mixed film lubrication. Film thickness is a function of viscosity, surface roughness, and relative velocity between load-bearing surfaces.
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