NSK Bearing Doctor

When a rolling bearing is damaged during machine operation, the entire machine or equipment may seize or malfunction. Since bearings that fail prematurely or unexpectedly cause trouble, it is important to be able to identify and predict failure beforehand, if possible, so that preventive measures can be adopted.
You can find the information about correct bearing handling, mounting, lubrication, and maintenance to prevent premature failure together with color photos of bearing failures.

ContentsBearing Damages by imagesFlaking, Peeling, Scoring, Smearing, Fracture, Cracks, Cage Damage, Denting, Pitting, Wear, Fretting, False Brinelling, Creep, Seizure, Electrical Corrosion, Rust and Corrosion, Mounting Flaws, Discoloration

Bearing Damages by soundsRace Noise, Roller Clicking Noise, Case Noise, Squeal Noise, Ball Flaw Noise, Contamination Noise, Ball Flaw Noise in Motor Bearing, Case Noise in Motor Bearing, Resonating Noise of Motor Bracket

The details of handling and maintenance of bearings are introduced in the web site (www.nsk.com).