What inspection method is best for ensuring proper contact in bearings?

The blueing method is particularly effective for ensuring proper contact in bearings. This technique involves applying a thin layer of blue dye or bluing compound to the surface of one of the components, typically the bearing or the shaft. When the component is reassembled and functioned, the contact points will transfer the dye onto the mating surface. Inspecting the pattern of the blue dye allows technicians to identify where contact is being made, indicating proper alignment and fit.

This method helps in evaluating the adequacy of bearing surfaces and can reveal issues such as misalignment or insufficient load distribution. The visual pattern left by the blue dye provides clear feedback on contact areas, facilitating adjustments if necessary. The clarity and specificity that the blueing method offers make it a preferred choice for ensuring proper contact in bearings.