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Butting rails together in 5 easy steps
TECHTALK DESIGN ADVICE SERIES YOUR CONTACT BUTTING RAILS TOGETHER IN 5 EASY 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 Measure
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
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 File
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
Align each length of rail and fix loosely with screws.
igus Inc. | 1-800-521-2747 | [email protected] | www.igus.com
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 | [email protected] | www.igus.com
What tells Routine Urine Examination Specific gravity Animals producing large volume of urine have low specific gravity where as very small volume of urine has high specific gravity (animal with oliguric acute intrarenal failure that has a low urine volume and low specific gravity) . Fluid therapy, diuretics, glucocorticoids and diet affect urine specific gravity. Sp. gr. is higher in
Fatigue: An Overview Thomas C. RosenThal, mD; BaRBaRa a. majeRoni, mD; RiChaRD PReToRius, mD, mPh, and KhaliD maliK, mD, mBa, Department of Family Medicine, University at Buffalo, Buffalo, New York Fatigue, a common presenting symptom in primary care, negatively impacts work performance, family life, and social relationships. The differential diagnosis of fatigue includes lifestyle issu
TECHTALK DESIGN 
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 
Step 5