When replacing ball bearings on an electric motor shaft, what is the recommended method?

When replacing ball bearings on an electric motor shaft, applying even force to the inner race is the recommended method because it ensures that the load is distributed uniformly across the bearings. This technique minimizes the risk of damaging the bearing during installation, as excessive force on the outer race can lead to deformation or damage of the bearing or the housing. By focusing the force on the inner race, the bearing can be installed properly without introducing stress that might affect its performance.

This method is especially important because ball bearings have precise tolerances and any misalignment or uneven force can lead to premature wear or failure. When the inner race is pressed onto the shaft, and force is applied evenly, it allows the balls to properly seat within the raceways, ensuring optimal functionality and longevity of the bearing.

Other methods such as heating the outer race may facilitate installation due to thermal expansion, but they can also lead to uneven heating and potential material degradation. Applying torque to the outer race can introduce stress to the balls, causing misalignment or damage. Lubricating before installation is good practice, but it does not address the mechanics of how to properly install the bearings without risking damage. Thus, focusing on even force application to the inner race is the most effective and recommended approach.