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If we take into consideration time, a life can be expressed in terms of hours of operation:<br />
Where: n = RPM<br />
LH10 =<br />
L<br />
10<br />
x<br />
10 6<br />
60 x n<br />
(hours)<br />
In general, bearing life, and ultimately <strong>spindle</strong> life, will depend upon many factors, including<br />
speeds, loading, lubrication, and bearing size. Computer models are often used to forecast life;<br />
however, a typical <strong>spindle</strong> bearing life for very high speed operation should be in the range of<br />
5000 - 7000 hours, assuming the <strong>spindle</strong> is not crashed or misused.<br />
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