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Sunday, March 21, 2010
The logic Of Science Behind Vastu
Tuesday, March 2, 2010
Ball Bearing Information
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Bearing TypesThere are two basic types of mechanical bearings used in machinery: sleeve bearings and rolling bearings. Bronze sleeve bearings are simple and inexpensive, but tend to be limited in the shaft velocities they will support. They also have considerable coefficients of friction that may consume a large proportion of the energy available to turn the shaft. Ball bearings, however, are almost limitless in the velocities they will tolerate as long as their lubrication is sustained.
Bearing Components
Ball bearings consist of three main sections, all of which are uniform and hardened for long wear: The inner bearing race fits snugly on the turning shaft. The outer race is a collar that fits snugly inside the bearing holder bore. Finally, there is a single or double row of uniform balls that may be touching one another or spaced at intervals between inner and outer races and retained by a ball cage. These bearings will last almost indefinitely if sealed, kept very clean and lubricated with a high film strength bearing lubricant.
Applications
Ideal applications for ball bearings are industrial machines that present both radial and axial loads, and moderate to high shaft velocities. On vehicles, they are preferred for moderate load bearings for motors, gear cases, and turbochargers. Modelers often use miniature ball bearings to extract the most performance from their cars, boats and planes.
Making Ball Bearings
The secret of caged ball bearing making is that the inner race is first inserted inside the outer race, and pushed to one side so it contacts the outer race. The balls are inserted into the large gap on the opposite side until about half of the space is filled. Then the balls are evenly interspersed and subsequently retained by stamped metal cages, making the inner and outer races concentric. The cage halves are then riveted together and the bearing seals, if any, added. This assembly configuration is the Conrad method and is by far the most widely used because of the ability of the finished bearing to handle both radial and axial or thrust loads. Other less-used methods are slot fill and split race which allow a higher ball density, but compromise axial loads.
Variations
Single row deep groove ball bearings are the most common, followed by double row, and self-aligning. Bearings may be shielded, sealed or double sealed. Some have grease fittings, some come permanently lubricated, and in the case of turbochargers, are continuously pressure lubricated with motor oil.
How Are Ball Bearings Assembled?
Parts
A finished ball bearing is comprised of four parts, which are manufactured separately before being assembled together--the inner race, the outer race, the balls and the cage.
Races
The inner race and outer race are the easiest parts to make, each consisting of a simple cylinder of steel. They are cut from steel pipes, a narrow band which is then smoothed and heat treated. The outer race is larger than the inner race, so that when the inner race is fitted within the outer, there is enough room for the balls to fit in between them.
Balls
The balls are formed from cut wire, which is shaped in a spherical press. The imperfections are smoothed and the balls are heat treated.
Cage
The cage is the mechanism that holds the balls in place in between the inner and outer race. It consists of one frame for each ball in the ball bearing assembly. In a metal cage, the frames are created separately and then fused together. In a plastic cage, they are formed with one mold.
Assembly
The balls are placed inside the cage and the outer race, and then the inner race is inserted into the middle. The balls, held in place by the cage, each have one point of contact with the outer race and one point of contact with the inner race.
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4 Key Ways To Maximize Bearing Life In Food Processing
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How can you maximize bearing life so that downtime is less costly, clean-ups are quicker and maintenance is easier? There are four key factors to keep in mind when selecting and maintaining bearings for the food industry:PROPER LUBRICATION
Using the correct lubrication in the correct quantity can extend bearing life.Lubricants used in the food industry are classified asFDA/USDA H1 or H2 approved. Over lubricating or under lubricating bearings can increase friction and cause bearing failure. It is necessary to identify the right amount of lubrication for the particular environment. Additionally, there are a wide variety of greases available and not all greases are compatible. Consult ARB Bearings Limited to determine the correct type and amount of lubrication to maximize bearing performance and lifespan in your work environment.
BEARING TYPE AND STYLE
Selecting the correct bearing type and style makes all the difference to a bearings lifespan. Stainless steel bearings provide corrosion resistance in wet environments.
CORRECT HOUSING FOR THE APPLICATION
For food applications, look for non-toxic, thermo-plastic reinforced with stainless steel. The advantage of these is that their smooth finish helps prevent bacteria from lodging in gaps or cracks. They are also chemical resistant for less chipping or flaking during washdowns with detergents. Look for a solid base to prevent water and contamination from collecting to inhibit bacterial growth.
SEALS AND END COVERS
Other components that can help prolong bearing life include:
Seals - these provide extra protection for bearing lubrication while preventing contaminant entry.
End covers for housed units - food grade units are made of thermo-plastic and non-food grade bearings are made of pressed steel. End covers solve issues related to exposed shaft ends, such as Workplace Health and Safety concerns as well as possible contamination.
ARB Bearings Limited specializes in precision machine technology, refined through years of bearing manufacturing. Our extensive list of products includes high temperature bearings, mounted units complete with end covers designed to easily clip on without requiring special housings and more. For more information on how ARB Bearings Limitedcan help maximize bearing lifespan and performance, minimize downtime and reduce costs in your facility, contact at http://www.arb-bearings.com










