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Generally speaking, the service life of a bearing can be defined as the number of revolutions or hours of operation that a bearing can perform before it requires replacement or maintenance.

Bearing lifecalculator

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SKFbearing lifeCalculator

The industry standard for measuring bearing life is the L10 life, which is defined as the number of revolutions or hours of operation that 90% of a large population of bearings will complete before failure, assuming they are all operating under the same conditions. This means that 10% of the bearings in the population may fail earlier than the L10 life, while 90% will last as long or longer.

Bearing lifecalculation pdf

Regular maintenance and proper lubrication can help to extend the effective service life of a bearing and prevent premature failure.

The basic dynamic load rating (C) of a bearing is the load that a bearing can theoretically last for  one million revolutions without experiencing fatigue failure. This rating is determined by the size and design of the bearing and is provided by the bearing manufacturer.

Bearing lifemeaning

Selecting the correct bearing will be determined by its life calculation. It’s not just a matter of selecting the right bearing, but also understanding how long it will be in service. Calculating bearing life enables engineers to predict its useful life. Engineers can be confident that the bearings selected will remain in service providing the optimal  performance.

Bearing lifein hours

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Bearing lifechart

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The scale of bearing life refers to the expected duration of time that a bearing can operate effectively before it needs to be replaced due to wear or failure. Bearing life is typically measured in terms of the number of revolutions or hours of operation before the bearing fails.

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In general, a bearing’s useful service life is the amount of time during which it can continue to function properly without suffering excessive wear or damage. The number of hours of operation, rotations, or cycles that a bearing operates is used to express the bearing’s effective service life.

One way to estimate the effective service life of a bearing is to use the basic rating life calculation taking into account the load and speeds present. The basic rating life is the number of revolutions or operating hours that a group of identical bearings can last before failure.  A failed bearing is evident  when material fatigue occurs on one or both of the rings or rolling elements .

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The speed factor is an important consideration when calculating the expected life of a bearing. The speed factor is a function of the bearing’s operating speed.

Ballbearing lifein hours

Where X and Y are coefficients that depend on the bearing type and size, Fr is the radial load, and Fa is the axial load. The equivalent dynamic load rating is then compared to the basic dynamic load rating to determine the expected life of the bearing.

The basic principle of bearing life calculations is to conclude that 90% of the bearings will meet or exceed the calculated life while 10 % may not.

The operating  conditions,  loads , speeds, and  lubrication and bearing precision affect the effective service life of a bearing.

SKFbearing lifechart

To use this formula, the dynamic load capacity and applied load on the bearing must be known. Once these values are determined, they can be used in the bearing life formula to calculate the expected life of the bearing. It is important to note that this formula provides an estimate of the bearing life, and other factors such as lubrication, contamination, and operating temperature can affect the actual life of the bearing.

Bearings are crucial components in machinery and equipment that require rotational motion. Bearings are incorporated into rotating parts to reduce friction. The expected life of a bearing under particular operating circumstances can be determined by doing  life calculations.

The speed factor (n x dm) is the product of the bearing’s operating speed (n) and the mean diameter of the bearing (dm). The mean diameter is calculated as the average of the bearing’s inner and outer diameters. The speed factor is expressed in units of mm/min.

The speed factor is used to calculate the bearing’s equivalent dynamic load rating (P). The equivalent dynamic load rating is the load that a bearing can theoretically withstand for a million revolutions at the given operating speed. The equivalent dynamic load rating is calculated using the following equation:

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Bearing life is a key factor to consider when selecting the right bearing for an application. Depending upon the application, the bearing may be exposed to different  loads, temperatures, and speeds. This means that different bearings will provide different levels of life expectancy. It is important to consider the expected life of a bearing before making a selection to ensure it will meet the requirements of the application.

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