Page 15 of catalogue Precision rail guides of SKF Linearsysteme GmbH

Ball and crossed roller assemblies for LWR rail guides Ball assemblies Where moderate loads are to be supported by a rail guide and greater priority is given to smooth operation and low friction, the use of ball assemblies is recommended. LWJK ball assemblies are provided with a plastic ball-retaining cage. These are available for sizes 1 and 2. Crossed roller assemblies Where greater stiffness is required, crossed roller assemblies are recommended. Various cage types are available, depending on the size of the rollers. LWAK crossed roller assemblies are fitted as standard for size 3 with a plastic cage to retain the cylindrical rollers. LWAL crossed roller assemblies are available in sizes 6 to 12 with aluminium cages. They comprise retained rollers. End pieces for LWR rail guides End pieces prevent the drift of the cage away from the loaded zone. LWERA end pieces fulfil these requirements in low-load conditions combined with horizontal mounting. Attachment Screws for LWR rail guides In particular in the case of long rail guides, heat treatment can lead to thermal expansion which will also influence the distance between the tap holes. Special attachment screws compensate for this longitudinal expansion. LWGD special attachment screws can be used for all rails within the Modular Range.

SKF modular range The LWR rail guides form the basis for the whole Modular Range system. All guides with designations commencing LWR... included in this catalogue are interchangeable with each other within a given dimension series. All external and attachment dimensions correspond with those of the LWR series. LWR rail guides are available in a total of nine sizes. The “Modular Range” includes sizes 3, 6 and 9 which, according to experience, cover 80 % of the normal market requirements. To enable prompt delivery from stock, certain standard rail lengths have been defined. SKF Modular Range rail guides are specially highlighted in the Tables. For further information, please refer to pages 5 to 7.

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