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Bearing
acoustical noise is a function of both the bearing itself and the
way in which it is used. Bearings can be specified as 100% noise-tested
during manufacture. Bearing noise is not generally influenced by ABEC
precision, but rather by manufacturers’ internal quality standards,
particularly raceway finish. There are no fixed reference standards
among manufacturers for noise testing.
|
| DYNAROLL
CODE |
NOISE TESTING LEVEL |
| No Code |
Standard bearing - not noise tested |
| E |
Noise tested to meet electric motor quality
quietness standards. |
| ER |
Ultra low noise tested to spindle motor quietness
standards. |
External factors affecting bearing noise include lubricant type, excessive
load, improper fitting, preload method, and other factors. In particular,
it is recommended that the stationary ring always be securely immobilized
during high speed rotation.
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