Page 10 of catalogue Precision rail guides of SKF Linearsysteme GmbH

Grading Precision rail guides with limited travel are generally mounted in pairs. In order to obtain the same assembly height T (Fig. 7), the rails are graded and supplied in pairs. This ensures that any two similar rail guides in a system will have the same height. If two or more rolling element assemblies are to be mounted immediately behind each other in a rail guide, the rolling elements must have the same tolerance grade. On request, graded rolling element assemblies can be supplied. Rails of the same profile for recirculating roller assemblies, which are to be mounted immediately adjacent to each other or immediately behind each other should be ordered in graded condition. Depending on their type, they will be graded in height or in height and width and delivered as a single package. Rail guide sets are always matched so that it is not necessary to request this when ordering. Tolerance of distance between attachment holes The maximum deviation in the distance between the attachment holes measured from centre to centre is ± 0,8 ‰ of the rail length L for onepiece rails (Fig. 8). Where the rail consists of several sections, the tolerance is also ± 0,8 ‰, related to the length of the longest section. Rails having tighter tolerances for the distance between the holes can be supplied on request. Marking of matched sets Matched Components are marked with consecutive numbers as indicated in Fig. 8a.

Fig. 7

(=B1+B2)

Fig. 8

Fig. 8a

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