In a Babbitt bearing, the corners of the bottom half must be?

In a Babbitt bearing, the corners of the bottom half must be relieved to allow for proper lubrication and to accommodate thermal expansion. Relieving the corners helps to create a space where oil can accumulate, ensuring that there is sufficient lubrication around the bearing surfaces. This is crucial because it helps minimize wear and prevents metal-to-metal contact that could lead to premature failure of the bearing.

Additionally, relieving the corners assists in the alignment of the bearing when it is installed and can aid in the distribution of load across the bearing surface. This practice is essential to maintaining the longevity and efficiency of machinery components that rely on Babbitt bearings for smooth operation. Sanding or filing smooth might create a flat surface but would not provide the necessary clearance and lubrication pathways essential for the effective functioning of the bearings.