What does the resulting bearing clearance after a machine has reached operating temperature and lubrication is supplied refer to?

Running clearance refers to the gap between the bearing surfaces that occurs after the machine has reached its operating temperature and proper lubrication is established. At this point, thermal expansion occurs, causing components such as shafts and housings to expand. If the lubrication is adequate, it will form a film that maintains the clearance necessary for effective operation. This clearance is crucial for ensuring smooth rotation and minimizing friction.

Understanding running clearance is essential as it directly impacts the bearing's performance, durability, and risk of failure. The other terms pertain to different stages or conditions of clearance in the bearing's lifecycle. Initial clearance would refer to the gap when it is first installed, without accounting for thermal effects or lubrication. Installed clearance would be the measured clearance before the machine is in operation, and optimal clearance signifies the ideal clearance for efficient operation, but it does not necessarily reflect the state once operating conditions are reached.