Several common mistakes can lead to premature bearing failure.

Choosing Based Only on Load

A bearing may have sufficient load capacity but still fail because of excessive wear, poor lubrication, contamination, or misalignment.

Ignoring Oscillating Motion

A bearing designed for continuous rotation may not perform the same way under frequent oscillation.

Using the Wrong Shaft Material

The bearing and mating shaft form a tribological system. Shaft hardness, surface finish, and material compatibility can significantly affect bearing life.

Underestimating Contamination

Dust and abrasive particles can dramatically accelerate wear, especially in mining and construction environments.

Focusing Only on Initial Cost

A lower-cost bearing may become more expensive over its service life if it requires frequent replacement or lubrication.

The total cost of ownership should include bearing price, installation, lubrication, maintenance labor, downtime, and replacement costs.

A Practical Plain Bearing Selection Checklist

Before choosing a heavy-duty plain bearing, engineers should collect the following information:

1. Load: What are the radial, axial, static, and dynamic loads?
2. Motion: Is the movement rotational, oscillating, or reciprocating?
3. Speed: What are the minimum, average, and maximum speeds?
4. Temperature: What is the complete operating temperature range?
5. Lubrication: Is external lubrication available?
6. Environment: Is the bearing exposed to dust, water, chemicals, or salt?
7. Shaft: What are the shaft material, hardness, diameter, and surface finish?
8. Housing: What are the housing dimensions and tolerances?
9. Maintenance: How frequently can the machine be serviced?
10. Service life: What operating life is required?

Once these parameters are established, the appropriate bearing material and design can be selected with much greater confidence.

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