Expansion Clamp
Nerio Cintron
You'll find the crimp fittings are a lot more available. I have found no local retail plumbing stores in my entire metropolis which sell the expansion style of anything. Also, there is no warranty on the expansion type unless you're certified so I'm told. Not that warranty claims on any plumbing install are that common or plausible anyway.
A lot of plumbers prefer expansion because it's more reliable to install. They claim, they have fewer leaks and they don't even check their fittings. Some plumbers claim it's more durable against things like frozen pipes etc. And, you get less friction due to the interior size of the fittings being larger - that is obvious due to the nature of how they are designed. However, I personally have never had issues with restricted flow anyway.
I've put in thousands of miles of crimp style pex and never once had one of my fittings fail. Never the first time, and never later to my knowledge save a couple of cases where someone's house heating failed and the pipes froze (still not as many issues as I've seen with copper pipes failing due to freezing.) Some of those installs are approaching 10 years old, I've heard of no issues. I use the cinch style clamps, not the copper rings. Mostly because if I have to remove something, it's easier. They are easier to work with in cramped areas as well and from what i've heard, they hold up better than copper.
As I understand it, the expander only works on PEX-A tubing which is more expensive and not as durable/chemical resistant. I have found that in many instances I had to make a connection in a tight space and needed the compact compression ring tool. The expander has the advantage of working before the connection is made, so I suppose if you plan ahead you can avoid using the tool in a tight space, but the tool looks a bit more difficult to use in, say, a crawlspace where you'll be lugging around an extension cord everywhere you go.
Mitee-Bite ID Xpansion Clamps or Expansion Clamps as they are also known, are low profile clamps. They are an ideal way to hold parts on an inside diameter for multiple machining on a vertical machining centre.
The customer machines the mild steel clamp to match the bore of the part ensuring proper fit. Frequently, the clamps can be re-machined for different-sized jobs. One of the benefits of these low-profile clamps is holding many lathe parts, for secondary machining, on one compact set-up. They are quickly tightened with a hex key, and torque driver or can be mated to hydraulic pull cylinders for automation.
Expand clamp approximately 0.1 mm over relaxed diameter and machine to fit workpiece bore, either on lathe or mill. If machining the clamp on a lathe use the nut provided, on the back of the clamp, to tighten the tapered screw. This nut is used only to machine the clamp.
Machine a pocket, in the fixture, for the close Tolerance "E" dimension and drill and tap mounting holes per "H" column. Drill and tap a hole from the "I" column in the centre of the pocket for the tapered screw. A recessed dowel pin may be installed into the flange for additional rigidity if required.
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The flange diameter, the same dimension as the #8 ID Xpansion clamp, is held to a close tolerance for precision mounting of multiple parts on a workcube or fixture plate. Once machined, these lowprofile clamps can be tightened with a hex key or hydraulic pull cylinder. The screw, with the tapered head, goes through the clamp and mounts directly into the fixture plate or pull cylinder for additional rigidity.
Dosage compensation is an essential process that equalizes transcript levels of X-linked genes between sexes by forming a domain of coordinated gene expression. Throughout the evolution of Diptera, many different X-chromosomes acquired the ability to be dosage compensated. Once each newly evolved X-chromosome is targeted for dosage compensation in XY males, its active genes are upregulated two-fold to equalize gene expression with XX females. In Drosophila melanogaster, the CLAMP zinc finger protein links the dosage compensation complex to the X-chromosome. However, the mechanism for X-chromosome identification has remained unknown. Here, we combine biochemical, genomic and evolutionary approaches to reveal that expansion of GA-dinucleotide repeats likely accumulated on the X-chromosome over evolutionary time to increase the density of CLAMP binding sites, thereby driving the evolution of dosage compensation. Overall, we present new insight into how subtle changes in genomic architecture, such as expansions of a simple sequence repeat, promote the evolution of coordinated gene expression.
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