What is meant by "film thickness" in lubrication?

Film thickness refers to the layer of lubricant that exists between two contacting surfaces in a mechanical system. This thin layer is crucial for preventing direct metal-to-metal contact, which can lead to wear and increased friction. A sufficient film thickness ensures that the mechanical components are protected from damage during operation. It plays a vital role in the overall performance of machinery, as it helps to maintain efficiency and extend the life of the equipment.

In various operational conditions, the film thickness can be influenced by factors such as the viscosity of the lubricant, the load applied to the surfaces, and the speed at which the components are moving relative to each other. Understanding the concept of film thickness is pivotal for lubrication technicians since it directly impacts the selection of lubricants and lubrication techniques used in different applications.