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Effect of rotational speed on preload

Using strain gauges, SKF has determined that preload changes with rotational speed and that there is a marked increase in preload at very high rotational speeds. This is mainly attributable to the heavy centrifugal forces on the balls causing them to change their position in the raceways.

When compared to a bearing with steel balls, a hybrid bearing (bearing with ceramic balls) can attain much higher rotational speeds, without significantly increasing preload, as a result of the lower mass of the balls.

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