Considerations for Calculating the Life of Radial Ball Bearings

Theoretically, under perfect circumstances, radial ball bearings would never have to be replaced, assuming they were used in a correct application at all times. Unfortunately, like everything else in this world, time takes its toll on the usability and continued success of any application of these bearings.

In order to help better calculate the useable lifespan of the radial ball bearing that you are replacing, consider the following contributing factors:

Load

It may go without saying, but because a bearing is designed to reduce friction between two surfaces, the less contact a ball has with the surface of its raceway, the better the bearing will operate, and the longer it will perform.When determining the expected life a of bearing, one must take into consideration both the radial load, and the thrust. By using a radial ball bearing that is appropriate for the radial load and the thrust, one can extend the expected lifespan of said bearing.

Operating Speed

The normal expected operating speed of a radial ball bearing will, of course, vary according to its application. However, generally, smaller bearings can be used at greater speeds, and with better precision. The heavier the load exerted upon the bearing, the less speed the bearing is capable of supporting.

Lubrication

In order to help a radial ball bearing perform in the most expedient manner, lubrication is recommended, and sometimes required. The type of lubricant used will depend on the type material from which your particular bearing is comprised. Generally, good lubricants for radial ball bearings include oils, grease, and dry films.

• Oil - Synthetic oils are commonly used to lubricate most ball bearings. If a bearing is to be subject to high speeds for substantial periods of time, the use of mineral oils may prove more successful, and if a bearing is subject to both high speeds and heavy loads, a petroleum-based lubricant may be optimal. A bearing may be lubricated by dripping the oil in to bearing itself, however many bearings that require an oil lubricant may be fabricated with the lubricant already present. Some metals that comprise the bearings actually absorb oils, allowing for a more successful useable life-span.
• Grease - Grease is an appropriate lubricant for a bearing that is used at moderate to high speeds. Silicone-based greases are best for bearings used at low speeds.
• Dry films - Dry films lubricants, such as graphite, are preferred whenever a "wet" lubricant, such as oil or grease, would be squeezed out of the bearing when subject to use. However, dry film lubricants tend to pick up significant amounts of residue that could impede the continued successful use of that bearing.

Environment

A properly lubricated bearing that is kept free of grime and residue can be expected to last longer than a bearing that is not looked after. Additionally, atmospheric humidity can cause oxidation, which would increase the friction between the surface of a ball and its raceway, thus shorten a bearing's useable life-span.

Replacing damaged or radial ball bearings that are no longer operating properly takes time, effort, and of course, is a financial investment. Whether you are looking for a bearing for recreational uses, such as for inline skates, or your company needs a replacement bearing to repair a private jet, the Big Bearing Store would be happy to help you find what you are looking for, and is able to provide advice on how to keep your replacement bearing in optimum condition for as long as possible. To learn more about how long you can expect your new radial ball bearings to be fully operational, or to find the best replacement bearing for your specific application, contact us.