The reason for the problem of CNC machine tool bearing

一、Improper installation

1、Use brute force during installation. Directly hitting the bearing with a hammer will cause the most damage to the bearing; it is the main cause of deformation.

2、The installation is not in place, the installation is biased or not installed in the bearing position, resulting in too small bearing clearance. The inner and outer rings are not at the same center of rotation, causing disagreement.

Recommendation: Select an appropriate or professional bearing installation tool, and use a special instrument to detect it after installation.

二、Poor lubrication

According to the survey, poor lubrication is one of the main causes of premature bearing damage. The main reasons include: not adding lubricant or lubricating oil in time; lubricant or lubricating oil is not filled in place; improper selection of lubricant or lubricating oil; incorrect lubrication method, etc.

Recommendation: Choose the right lubricant or lubricant and use the correct lubrication method.


Contamination can also lead to premature bearing damage, which means that dust, metal chips, etc. enter the bearing. The main reasons include: opening the bearing packaging too early before use, causing pollution; the working environment is not clean during installation, causing pollution; the working environment of the bearing is not clean, and the working medium is polluted.

Recommendation: It is best not to disassemble the bearing before use; keep the installation environment clean during installation, clean the bearing to be used; and strengthen the bearing seal.

四、 fatigue

Fatigue damage is a common way of damage to bearings. Common causes of fatigue damage may be: long-term overload operation of bearings; failure to repair in time; improper maintenance; equipment aging.

Recommendation: Select the appropriate bearing type and replace the fatigue bearing regularly.

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