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Butting rails together in 5 easy steps

Linear rails typically come in lengths
between six and 12 feet (1829-3650
millimeters), but customers often ask:

is it possible to make rails longer by
butting them together?
The answer is yes and linear plain
bearings, like igus®’ line of DryLin®
linear bearings and guides, are ideal

for these types of applications.
Since linear plain bearings slide on a plane and “bridge” the gap in between the two rails, they are a better choice than a rolling-element At the onset, this task may seem simple – how difficult could lining up the ends of a few pieces of aluminum really be? However, it is very important that the rails are butted together correctly. Follow these five steps to make joining long lengths of rail a simple and easy task. Step 1

together rails that differ in height or width by more than challenging if you are trying to match a brand new rail with one purchased years ago because manufacturing tolerances vary from lot to lot between aluminum extrusions. In addition, there might be a variation in color. So, ideally, it is best to use rails from the same manufacturing lot, or alternatively, use precision ground aluminum or steel shafting that have much tighter machined tolerances. Step 2

Cut the rails so that the bore spacing is symmetrical throughout the travel. For example, if the nominal distance between mounting bores is 120 millimeters (c4), then the distance from the end to the first holes on each end mating should be 60 millimeters (c5 or c6). Step 3

At the ends of each rail that will be joined, file a 30 - 45° x 0.5mm chamfer in all the surfaces that the bearing could contact. The filing can be done by hand. Make sure to de-burr afterwards. Please contact igus® if you would like us to quote this operation. Step 4

Align each length of rail and fix loosely with screws. igus Inc. | 1-800-521-2747 | | Step 5
Clamp and check

Before permanently fixing the rail assembly, align the rails with the help of clamps at the seam line and butt up against a straight-edge, if possible. Fix the screws and check the butt-joint to ensure the carriage(s) run smoothly over each joint. If the carriage does not run smoothly, you will need to realign the rails. igus Inc. | 1-800-521-2747 | |


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