New modular linear profile rail guides have been developed by SKF with improved self-aligning capabilities and high precision applications in mind.
The new LLT profile rail guides combine high operating speeds with heavy load capacities, while offering excellent rigidity, repeatability and accuracy.
“The modular design concept of the new range of LLT profile rail guides provides design and production engineers with a wide range of system build options, in terms of rail length, carriage size and profile, as well as for factors such as levels of accuracy, stiffness and preloading,” explains Vikesh Harikaran, SKF’s mechatronics manager. “For example, systems can be supplied for loads between 8400 N and 128 500 N, operating at speeds of up to 3,0 m/sec, with a choice of six types of carriage and unlimited stroke length.”
Raceways
The arrangement of four raceways with a 45° contact angle between rolling elements and raceways ensures equal load-carrying capacity in all four load directions while reducing frictional losses to a minimum and offering with low break-away forces. This helps to produce smooth, easily controlled operation, even at extremely slow speeds, and plays a crucial role in providing extended operating life with minimal maintenance.
The X-shaped raceway configuration offers superior self-aligning properties, combined with the ability to virtually eliminate variations between the rail and carriage, even under preload conditions. For example, lateral deviation between carriage and rail is within plus or minus 10 microns. This makes the new guides ideal for use in high performance single and multi-axis applications.
Seals and lubrication
The carriages are fully sealed and incorporate specially developed double-lipped seals at either end as well as longitudinal side and inner seals to ensure that lubricants are retained and to prevent the ingress of contaminants. Carriages are supplied pre-lubricated and have integral grease cylinders to ensure ongoing re-lubrication, helping to lower lubrication costs and improve reliability.
Construction
The robust LLT profile rail guides are manufactured from inductive and case hardened steel with the main dimension in accordance with DIN 645-1. Various accuracy and preload classes are available to suit different precision and stiffness requirements. Operating temperatures range from -20°C to +80°C, although the units can withstand temperatures of up to 100°C for short periods.
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