What is the first step to be completed when fitting a mandrel or journal to a newly poured babbitt bearing?

When fitting a mandrel or journal to a newly poured babbitt bearing, the first step is to relieve the edges. This step is crucial as it helps to ensure that the newly poured babbitt can accommodate the mandrel or journal properly. By relieving the edges, you create a slight bevel or chamfer around the edge of the bearing surface. This action can help in preventing any binding or excessive wear during the initial fitting process.

Relieving the edges also facilitates easier entry of the mandrel into the bearing by reducing any sharp edges that could cause damage to either the bearing surface or the mandrel. Once the edges are relieved, you can accurately fit the mandrel, ensuring a secure and proper alignment before moving on to other necessary steps like measuring the diameter, applying lubrication, and finally installing the journal. These subsequent activities depend on having the proper edge preparation in place first.