THE DURO-A.
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Catalog excerpts

THE DURO-A. - 1

THE DURO-A. FROM RÖHM. The DURO-A is a three-jaw chuck with through-hole. It is most commonly used for turning of cylindrical and disc-shaped unfinished parts, and can be activated automatically (e.g. hydraulically). The DURO-A effortlessly handles high speeds, has formidable clamping force, and was designed with a reduced interference contour, making it ideal for automated machining. The DURO-A replaces the Röhm KFD-HE power chuck, as well as the majority of the KFD-HS sizes. This chuck comes at a reduced purchase price and is backed by a 36-month warranty. The jaws of the KFD-HE and KFDHS fit on the DURO-A. STRENGTH AND DURABILITY DOWN TO A SCIENCE. STREAMLINED FOR SPEED DESIGNED FOR Automated machine tools APPLICATION Machining bars, tools, flanges, and discs BENEFITS High clamping forces (up to 250 kN, in the 400-version) High speeds (up to 8.000 turns per min. in the 165-version) Reduced interference contour Big through-hole WHEN RÖHM HOLDS FOREVER, 36 MONTHS IS NO BIG DEAL Get up to 8,000 rpms The elegant, scalloped design of the DURO-A reduces the mass moment of inertia, allowing the chuck to reach speeds up to 8,000 turns per minute in the 165 mm version. The DURO-A delivers up to 10% weight reduction, improved interference contours for easier live tool access. When your grippers, automatization devices, and power-driven tools have a smaller interference contour, they have more space to do their work. With a Röhm chuck you actually have to talk about precision? Not really. But maybe it is good for you to know that the repeat clamping accuracy is just ± 0.02 mm. Or the concentricity: two hundredths, that‘s a whole 20 µm. Even in the design of the chuck body of the DURO-A there are many aspects to be discovered. There is a grind band on the OD of the body to indicate the chuck precisely to the centerline of the spindle. This was done so you can measure the radial run-out of the chuck on the machine. They say the devil is in the details, and this is one detail we couldn’t overlook. The DURO-A not only offers high clamping force, it’s also made to go the distance. Even after 500,000 cycles the chuck keeps the 250 kN clamp force almost unchanged on the jaws. Give it a try and you’ll see that the DURO-A is the best option out there. clamping force over 500.000 cycles (e.g. Ø 254) 180 The through-hole accommodates hollow and partially hollow clamping The DURO-A is designed for hollow and partially hollow clamping, which means that the blanks can be pushed through the chuck. The bigger through-hole allows you to process bar and large-diameter raw materials. If you need this functionality, then look no further. Precision matters in modern manufacturing, and that’s why we developed the Röhm F-senso chuck to measure clamping force. The F-senso chuck is completely stable and simple to use - all you have to do is switch it on, clamp it in, and check your reading. FEWER LEAKS, CLEANER HANDS Our lubrication system gets the job done 2 Basic body 3 Center sleeve 4 Threaded ring/draw tube adapter 5 Annular piston 6 Base jaws HOW THE DURO-A BY RÖHM WORKS SIZE MATTERS Always know how hard you’re clamping: cylindrical centre mount Our production process is informed by a simple maxim. It goes “Röhm holds forever”. That’s why a 36-month warranty is something we’re happy to offer. We only have one request: every 12 months you have to schedule fee-based maintenance with one of our support specialists. A smart design that accommodates up to 250 kN Superior durability Backed by a 36-month warranty Competitive pricing The 400 mm chucks of the DURO-A family have a clamping force of up to 250 kN. There is no comparable chuck on the market that matches the DURO-A’s clamping force or gives you the same level of cutting performance. The DURO-A’s world-class engineering also saves you valuable machine time, essentially putting money back in your pocket. Image 1: the large through-hole lets you process raw material with big diameters via partially hollow clamping ... Image 2: ... when used with a hollow clamping cylinder the large through-hole supports completely hollow clamping, allowing you to process the bar materials. The DURO-A utilizes a smart system consisting of lubrication nipples, lubrication drilling and lubrication bags, giving you seamless operation and a longer life cycle. Every slot and drilling to the lubrication system is designed to remain tight when the chuck is under pressure. The DURO-A wastes less lubricant, creates fewer spills, and doesn’t get your service technician’s hands as dirty when it’s time to do disassembly work on the machine. The DURO-A has a steel base body (2) to receive and protect its components. Toward the machine body, the cylindrical centre mount (1) closes the chuck using screws and a cylindrical opening. The clamping function is exercised by the three base jaws (6) in connection with the piston (5). The piston is tightly connected with the cylinder of the machine through a thread. If the cylinder is hydraulically activated, it pushes the piston into the base body of the chuck. Via the wedge hook inserted in the base jaws – this component is called a “wedge hook system” – the jaws radially move outward and release the material. To clamp material the cylinder moves in the opposite direction. For internal clamping, where the parts are clamped from the inside, the process is reversed. The center For further information about DURO-A visit our website: sleeve (3) seals the chuck and protects it from chips. The threaded ring (4) ensures a stable connection with the cylinder. Röhm also offers a threaded blank (draw tube adapter). Here, the unit uses fitted adapter rings to connect to a machine shaft with a short cone. The base jaws (6) are optional

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THE DURO-A. - 2

MAYBE YOU NEED SOMETHING DIFFERENT… THE DURO-A. FROM RÖHM. The DURO-A chuck is a real powerhouse. Why stop there though, when you can bring in the whole system? You can… We designed the DURO-A power chuck to give you the most out of your machine tool. We realize, however, that you may have unique requirements. Here are a few alternative Röhm clamping solutions that might just fit your needs. DURO-A SIZES AND SPECS … enter long rotating c parts with Röhm’s live centers. … easure clamping m force with the Röhm F-senso chuck. Simply clamp it into the lathe chucks and measure the clamping...

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