Precision rail guides

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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
Fig. 8
Fig. 8a
(=B1+B2)
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