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Bearing Lubrication
Grease
The most common form of bearing lubrication, grease is injected into the space between the balls and races. It is permanently sealed and therefore requires minimal maintenance. Grease is not recommended for high-speed operations as the resulting higher temperatures begin to break the grease down over time.
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Oil Jet
When grease is not a viable option, oil can be used. A common method of oil lubrication utilizes a high-pressure pump that delivers oil directly into the bearing race. This system is well suited for spindles that must tolerate high speeds, high loads, and high temperatures. The most complex bearing lubrication system, it is necessary to support high performance spindles.
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Oil Mist
Another method of distributing oil to the bearings involves mixing the oil with air. Oil droplets mix with compressed air and flow to the bearing area where in addition to lubrication, provide cooling and cleaning effects. This method makes it difficult to measure the amount of oil dispensed, so if the quantity of oil delivered must be very accurate another method of bearing lubrication should be selected.
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Air/Oil
A third method for oil distribution is called Air/Oil. In this configuration a drop of oil is pulled apart and distributed by a stream of air. This air current continuously delivers oil droplets and leaves the bearing free of oil residue.
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