In the life test, a total of eight bearings, or five groups of sixteen bearings,
were made to break down.
Each group in the table shows differences in travel distance between the first
broken bearing and the last one. The average values of five tests, and their
subsequent plotting on a Weibull chart, are shown right. The figure indicates
the presence of a minimum life. for the linear motion ball bearings.
Furthermore, the distribution of bearing's life, taking the minimum life into
account, is found to be nearly equal to a Weibull slope, e=10/9. Thus the
average life Ozak linear motion ball bearings with the breakdown probability of
F=50% proves to be about 430 km, representing extremely high dependability.
Also the reliability of Ozak linear motion ball bearings stands at 0.4, which
means our product in use are guaranteed 100% reliable until they reach 0.4 times
the amount of rated life. In order to further increase the life of the bearing,
Ozak has conducted many experiments.
The methods established in our R&D department are currently under patent
application. |
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