TRAPEZOIDAL THREADS, NUTS, SPECIAL THREADS, FEEDSCREWS
2Pages

As a SPEi with high offshore a ntAPEZOIDAL THREADS, NUTS, "iCIAL THREADS, FEEDSCREWS MALIST for CUSTOM MADE threaded parts we have more than 25 years of experience in industries quality requirements such as the drive technology sector, medical technology, food processing, pplications, the defense industry, heavy lifting machinery or special purpose machinery. applications we provide threaded parts with a very high degree of CUSTOMIZATION - this is our 0:h. We focus on your individual requirements not just on the norm. We can manufacture your thread out of any material including all turning, milling and drilling operations as well as subsequent end machining and surface finishing. Also SPECIAL THREAD DIMENSIONS with unusual threads depths, forms, THREAD PITCHES or THREADED ANGLES can be realized by us on short notice. Challenge us - we look forward to receive your request for quotation. - SPECIAL SCREW THREADS-WE CAN MANUFACTURE ANY TYPE OF THREADS ■ Multi start threading with 1, 2, 3 or 50 threads ■ Variable pitch threads ■ Lengths - 10 mm to 20 meter ■ Diameter - 10 to 300 mm ■ Internal threads up to 2.000 mm ■ Complex end machining ■ Standard, tempered and special materials (alubronze, special bronze, stainless steels, aluminum, hardened steels, plastics, non-magnetic steels...) ■ Heat treatments up to 8 meter length (annealing, hardening, tempering.) ■ Surface coatings / treatments (corrosion protection, galvanizing, pickling, electropolishing, phosphating.) ■ Prototyping, small series or mass production ■ Short lead times (2-3 weeks) GREAT PERFORMANCE UNDER HEAVY LOADS NO STICK-SLIP EFFECT The thread surface of a 121 lifting jack after the initial “running-in”of the screw with load nut and lubricant Clearly visible: no mechanical flattening in the valleys of the micro pockets where the lubricant is being stored. These excellent lubrication characteristics are typical for screws that are manufactured by Bornemann Gewindetechnik. The surface quality of the thread is a critical factor to avoid the Stick-Slip effect and therefore the seizure of the thread. Gewindetechnik Bornemann Gewindetechnik GmbH & Co., KG Klus 3, 31073 Delligsen Tel.: + 49 (0) 5187 - 94 22 0, Fax: + 49 (0) 5187 - 94 22 74, info@bornemann.de, www.bornemann.de made in Germany BORNEMANN GEWINDETECHNIK SPECIALISES IN FOR OFFSHORE APPLICATIONS IN LARGE OFFSHORE WINCHES, the reverse threaded spindles or diamond screws of Bornemann Gewindetechnik play a critical role in winding expensive special cables. The diamond screws are used in hoisting winches in spooling equipment known as level winders for neatly winding layer upon layer of extremely heavy cables that are often thousands of metres long. This special level winding equipment is used to maintain optimum fleet angle of the rope, which is a prerequisite when spooling cables in multiple layers. The cable is supported by a sheave that is slowly moved back and forth on aspooling system so that with each turn of the cable drum the cable is accurately placed tightly alongside the previous wrap. The lateral movement of the sheave is coordinated with the speed of the winch. This 16. April 2015 1

back and forth movement is performed by the Bornemann diamond screws, also called a reverse thread or diamond thread. As the sheave reaches each end of the spooling device, the reverse threaded screw automatically induces it to change direction and go back again. Thus no end switch and no speed reversing units are required at the spindle.. SPOOLING SYSTEMS WORK BEST WHEN THE LEVEL WINDER AND ITS THREAD ARE DESIGNED IN CONJUNCTION WITH THE PARALLEL GROOVING ON THE DRUM. THE TWO ELEMENTS SHOULD GO HAND-IN-HAND. OFFSHORE WINCHES ARE OFTEN EQUIPPED with the parallel Lebus grooving on the drum....