SKF Precision Technologies does not sell bearings. This is an educational site for the application of precision rotary motion bearings typical in the design of machine tool spindles. You can register and download the "Yellow Book" (Angular contact ball bearings catalog 5002/E) for immediate information. For complete information about the full line of SKF bearings, view SKF's Interactive Engineering Catalog: http://www.skf.com/portal/skf/home/products?newlink=first&lang=en or contact your local representative or distributor.

Bearing systems
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Machine tool bearings for metal cutting spindles, vertical boring mill tables, pallet fixtures or other specialized machine tool applications are a special knowledge base offered by SKF.

For a general overview on Machine tool bearings read Thomas J. Wenck's article on, "Bearing System for High-Performance Machine Tools. Many of the latest advances in the design and development of machine tools have been driven, in part, by a universal need to reduce costs and improve productivity. Today's machine tools offer enhanced capabilities promoting greater accuracy, higher speed, and greater stability, which promise to deliver production benefits. As a few examples, CNC lathes now feature four linear axes enabling two tools to work simultaneously; modularly designed and computer-controlled grinding machines adapt easily to perform different and multiple tasks; spindles are frequently designed as separate units to allow for quick interchangeability to reduce potential downtime."

For machine tool bearing specifications go to SKF's Interactive Engineering Catalog: http://www.skf.com/portal/skf/home/products?newlink=first&lang=en

The acquisition of SNFA Precision Bearings was finalized July 4th, 2006. SNFA is now part of the SKF Group. The combination of SKF and SNFA will create a full assortment supplier of high precision angular contact ball bearings and high precision cylindrical roller bearings. The combined entity will have access to a very strong product development and application engineering support.

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Silicone nitride cylindrical roller bearings (SNCRB)

These bearings are some of the best and simplest solutions for high-speed spindles where the capability to withstand heavy radial loads together with high rigidity is required.

SNCRB have been specifically designed to achieve a running speed much higher than conventional cylindrical roller bearings through the adoption of advanced ceramic rolling elements and a high-speed, high-tech plastic cage.

NITROALLOY® Series

SKF’s recent research and development activities in the field of materials have given birth to the Nitroalloy® bearings series. The demand for nitrogen alloyed stainless steel bearings originated in aerospace, an industry where there is no compromise when it comes to performance and reliability.

In addition to the special steel properties that make these bearings particularly suitable for aggressive environments and severe application conditions (such as, contaminated lubrication or high speeds), this new bearing series is equipped with silicon nitrite rolling elements that improve dynamic performance.

Magnetic

SKF’s magnetic bearings are a non-contacting technology, which means they have negligible friction loss, no wear and higher reliability. This allows the bearings to reach previously unachievable surface speeds. Lubrication and wear particles are eliminated, so these bearings can be incorporated into clean environment processes that are sensitive to contamination, such as the vacuum chambers where many semiconductor manufacturing processes take place.

Sealed high-precision angular contact ball bearings series

Polluted environments? What causes bearing failure?

Analysis of the origins of bearing failures showed about 40% of total cases were caused by contamination, such as particles and fibers accessing the area where rolling contact takes place: lubrication problems like polluted lubricant or loss of lubricant and corrosion due to inefficient bearing seals.

The new sealed high-precision angular contact ball bearings series is SKF’s solution to these problems and permits end users to minimize machine downtime for maintenance operations. Low friction seals, correct grease quantity and type enable high-speed ratings and at the same time act as a strong barrier to pollution and contamination agents, thereby extending the service life of the bearings.

KMT and KMTA locknuts

Accurate axial location of mechanical components

KMT and KMTA locknuts are precision-locking devices with a unique design. The three brass locking pins, which are equally spaced around the circumference, ensure effective locking and allow accurate adjustment to eliminate shaft runouts induced by the tightening torque.

KMT locknuts permit bearings and other components to be simply and reliably located in the axial direction on shafts. High-accuracy mounting and dismounting are also fast and easy. Moreover, KMT locknuts are reusable.