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The complete Industry News section from the January/February 2014 issue of Gear Technology.
Gear Technology's complete back issue archive is now available online. Read more about the archive in this issue's GT Extras. Also highlighted are a new video from Koepfer and the Gear Technology e-mail newsletter.
We are well into an odd-number year, so it must be just about time for another Gear Expo. Indeed, the big show -- Gear Expo 2013 -- kicks off in Indianapolis at 9:00 a.m. Tuesday, September 17, wrapping up Thursday the 19th at 4:00 p.m. And whether you are exhibiting or attending, the bottom line is you are going -- a good thing for you, your company and the tightly knit U.S. gear industry.
The complete Industry News section from the August 2013 issue of Gear Technology.
An in-depth look at the major booths with the latest technology used in gear manufacturing.
The latest video from Koepfer America, Sandvik's Gear Up event and IMTS product previews
This is the second in our series of interviews with the leaders in the gear industry. This interview is with Dennis Gimpert, president of Koepfer America, South Elgin, IL.
The complete Product News section from the May 2009 issue of Gear Technology.
Gears are manufactured with thin rims for several reasons. Steel gears are manufactured with thin rims and webs where low weight is important. Nonmetallic gears, manufactured by injection molding, are designed with thin rims as part of the general design rule to maintain uniform thickness to ensure even post-mold cooling. When a thin-rimmed gear fails, the fracture is thought the root of the gear, as shown in Fig. 1a, rather than the usual fillet failure shown in Fig. 1b.
Arrow Gear Company of Downers Grove, IL, has implemented a computer system that fully integrates exchange between all of its computer applications. The ELIMS (Electronic Linkage of Information Management Systems) project has increased manufacturing productivity and reduced lead times.
A common design goal for gears in helicopter or turboprop power transmission is reduced weight. To help meet this goal, some gear designs use thin rims. Rims that are too thin, however, may lead to bending fatigue problems and cracks. The most common methods of gear design and analysis are based on standards published by the American Gear Manufacturers Association. Included in the standards are rating formulas for gear tooth bending to prevent crack initiation (Ref. 1). These standards can include the effect of rim thickness on tooth bending fatigue (Ref 2.). The standards, however, do not indicate the crack propagation path or the remaining life once a crack has started. Fracture mechanics has developed into a useful discipline for predicting strength and life of cracked structures.
This article discusses the relationships among the fillet stress on a thin rim planet gear, the radial clearance between the gear rim and the gear shaft, the tooth load, the rim thickness, the radius of curvature of the center line of the rim, the face width and the module.
Bevel gears must be assembled in a specific way to ensure smooth running and optimum load distribution between gears. While it is certainly true that the "setting" or "laying out" of a pair of bevel gears is more complicated than laying out a pair of spur gears, it is also true that following the correct procedure can make the task much easier. You cannot install bevel gears in the same manner as spur and helical gears and expect them to behave and perform as well; to optimize the performance of any two bevel gears, the gears must be positioned together so that they run smoothly without binding and/or excessive backlash.
Publisher Michael Goldstein sat down with Dr. Thomas Koepfer, whose family company, Josef Koepfer & Söhne GmbH, was founded in 1867. Over the years, the Koepfer name has become one of the best-known in the gear industry, with company operations including the manufacture of gear machines, cutting tools and gears.
News Items About IMS Koepfer
1 Gleason to Acquire IMS Koepfer Cutting Tools GmbH (December 2, 2013)
Gleason Corporation has announced the signing of a definitive agreement to acquire IMS Koepfer Cutting Tools GmbH of Eisenbach, Germany f... Read News