Linear bearings made even better

New linear ball bearings are said to have improved accuracies and load ratings, smoother performance and reduced noise.



SKF's Mike Naismith explained to Eureka that LBC bearings are segmented linear bearings, but with a smaller steel content than previous and an increased use of plastics. At one time, linear bearings were all machined from steel tube that had to be ground from the inside. Now, such bearings can be made from hardened steel profiles that require much less machining, and are encapsulated in poyoxymethylene (POM), which is easier to form and offers superior performance. The combination of steel and POM reduces both weight and noise.

The range consists of four series. LBCR is a range of non self aligning linear ball bearings with high load rating, stiffness and guidance accuracy, for shaft diameters from 5 to 80mm. The LBCT series is made up of open, non self aligning linear ball bearings for guiding on fully supported shafts from 12 to 80mm in diameter. Type LBCD are closed, self aligning linear ball bearings, that give an adjustment of up to {{plusminus}} 30 minutes of arc, to allow for alignment errors that may, for example, arise when a shaft sags. Sizes are from 12 to 50mm. Completing the series is the LBCF range of open, self aligning linear ball bearings for shafts from 12 to 50mm. These are especially suitable for guidance on supported shafts.

All bearings comply with ISO Norm Series 3 and are available in corrosion resistant versions where required, with or without double lipped seals. TS

Pointers

* New linear ball bearings have improved accuracies and load ratings, smoother performance and produce less noise

* The improved performance arises from optimised, reduced segment sizes, facilitating production processes and increased use of plastic

* The series includes open, closed and self aligning designs with lifetime lubrication when equipped with double lipped seals

Author
Tom Shelley

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