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Maintenance depends on the type of enclosures and lubricants your bearings have. Rubber sealed or Ultra sealed bearings require no maintenance and the lube is good for the life of the bearing. Metal shielded bearings that use either grease or oil should be constantly maintained and frequency level with vary depending on your application. Oil dissipates faster than grease, so typically shielded bearings using oil as lubrication will require constant care. Developing a regular maintenance schedule will substantially add to the life of your bearing.
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Hybrid ceramic bearings use silicon nitride material to make precision balls. The ceramic balls, when used in an Angular contact ball bearing, offer distinct advantages over typical bearing-steel balls. Ceramic balls allow the spindle to achieve up to 50% more RPM, dissipate heat quicker have a much lower rate of thermal expansion.
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The contact angle determines the ratio of axial to radial loading possible, with radial loading being the primary benefit. Typically, contact angles of 12, 15, and 25º are available. The lower the contact angle, the greater the radial load-carrying capacity. Conversely, the higher the contact angle the higher the axial loading capacity.
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The termperature that a bearing can opperate in is determined by all of its components. If the races and rolling elements can withstand 200 degreec Celsius, but the retainer can only operate in 150 degrees, then the bearing can only operate in 150 degrees.
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There is no true water proof seal for bearings. Bearing seals are primarily designed to retain the lubrication inside the bearing. Most bearing seals are considered water repellant and will keep moisture out of the internal components, but they will not prevent water from entering the bearing if it is submerged. If you require a bearing that can operate submerged in a liquid, we would suggest a ceramic hybrid or full ceramic bearing depending on the operating environment.
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Angular contact ball bearings provide precision, load-carrying capacity, and the speed needed for cutting metal. Angular contact ball bearings also provide both axial and radial load-carrying capacity when properly preloaded.
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First you need to know your regreasing interval. This can be found by consulting your pillow block manufacturer. Obviously factors such as speed, load cycle, load values, environment etc will be required in order to work out regreasing intervals. Once this has been established, you can use of one of many auto-pot style greasing dispensers which deliver pre-set amounts of grease over set periods of time.
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No, full ceramic bearings can be run completely dry. They do not need lubrication to run. Ceramic is non-porous, unlike steel, as a result it is virtually frictionless. Ceramic also dissipates heat very quickly, which is the same reason they use it on the underside of the space shuttle. Because there is no heat buildup and virtually no friction, full ceramic bearings can be run completely dry. They can be cleaned out with regular tap water or any cleaner, they are impervious to corrosion and can operate in a vacuum environment.
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It is the nominal angle between the ball-to-race contact line and a plane through the ball centers, perpendicular to the bearing axis.
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All of our sealed bearings are considered maintenance free and lubed for the life of the bearing. This is because they are packed with a heavy duty, lithium based grease. When the lube fully dissipates it is generally time to replace the bearing. However this does not mean that you cannot extend the life of the bearing. When they start to feel gritty you can remove the seals and soak the bearings in our Clean Touch overnight. Then you can re-lube them with your lube of choice. Just keep in mind that the thinner the lube is, such as oil vs. grease, the quicker it will dissipate and need to be reapplied.
