What undesired contact can occur if lubrication is inadequate on a rolling element bearing?

Inadequate lubrication on a rolling element bearing primarily leads to sliding or skidding. Rolling element bearings are designed to support loads while facilitating smooth motion through the rolling of the elements, such as balls or rollers. When lubrication is insufficient, the friction between the bearing surfaces increases significantly.

This heightened friction can negate the intended rolling action and cause the elements to start sliding against each other instead. This sliding or skidding creates undesirable wear patterns and can lead to overheating, significantly reducing the bearing's life and efficiency.

Thus, achieving proper lubrication is critical in maintaining the intended operation of rolling element bearings and preventing these detrimental effects.