As specified in AGMA , you can use this input window to define the probability of scuffing and wear as well as susceptibility to micropitting (frosting). Find the most up-to-date version of AGMA at Engineering AGMA A03 (R) Effect of Lubrication on Gear Surface Distress The purpose of this information sheet is to provide the user with information pertinent to.

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The equations provided herein allow the user to calculate specific oil film thickness and instantaneous contact flash temperature for gears in service.

The need for a “level playing field” in the critical arena was one of the reasons the association was formed in the first place. The following method expands upon the concepts described in AGMA A06 to allow the user to calculate not only the top-land thickness, but the more general case as well, i. This analysis uses the same base data Blok’s equations as the calculation of scuffing according to the flash temperature criteria given in DINPart 4.

These points can be utilized in any modern computer-aided design software package to assist in the generation of a 3D solid model; all pertinent tooth macrogeometry can be closely simulated using this technique. This paper explains how this algorithm can be applied for gear rating procedures.

Search by Author here. As always, the annual meeting was a agmma opportunity to network and meet with other AGMA members. SCOPE This information sheet is designed to provide currently available tribological information pertaining to oil lubrication of industrial gears for power transmission applications. These two parameters are considered critical in defining areas of operation that may lead to unwanted surface distress.

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In addition, it added several improvements including: This could change come the census, but there’s no denying Buckeye Nation is going places. Furthermore, there seems to be no tolerancing on the major and minor diameters of a gear. It went relatively unnoticed in the U. Gear Expo has always been a family reunion of sorts, but it’s first and foremost an opportunity to show off the latest and greatest technologies that are impacting the gear industry today. Gear Expo provides you with the greatest collection of gear expertise, know-how and experience you can find.


All the people attending the Gear Expo in Detroit have an interest. However, in response to the growing interest in a global marketplace, AGMA became involved with the International Standards Organization ISO several years ago, first as an observer in the late s and then as a participant, starting in the early s. The centennial kicked off in October with a dinner at the AGMA Gear Expo in Detroit and will continue throughout with a number of exciting events scheduled to celebrate this milestone anniversary.

The semi-width of the Hertzian contact band was calculated based on the normal relative radius of curvature; Derating factors for application, misalignment and dynamics were explicit input data; Options for coefficient of friction were part of input data, including a constant 0. However, defining the permitted scuffing temperature according to AGMA presents more of a problem, because of the lack of comprehensive or generally applicable information.

But there is a connection of sorts. Who cares about it?

The lack of industry-wide gear standards meant there were no standard gear tooth sizes, ratings, quality definition or consistent manufacturing methods” Celebrating Years of Gearing, pg. This should be considered a work in progress as more is learned about the theories and understanding of the various parameters and how they affect the life of the gear. The points of interest that AGMA A06 address consist of toe, mean, heel, and point of involute lengthwise curvature. The purpose of this information sheet is to provide the user with information pertinent to the lubrication of industrial metal gears for power transmission applications.


It has been introduced as an aid to the gear manufacturing and user community. No attempt is made to qualify or judge the standards other than to comment on the facilities or lack of them in each standard reviewed.

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But the greatest problem lies with the authors’ use of older versions of these documents. InKelley [4] changed his surface roughness term slightly. Please note included photos – it seems that the crack has started at the root fillet. The information would also provide the user with more tools to help make a more informed decision about the performance of a geared system. Moore of Burgess-Norton Mfg. AGMA A06 — Calculation of Bevel Gear Top Land and Guidance on Cutter Edge Radius — lays out a practical approach for predicting the approximate top-land thicknesses at certain points of interest — regardless of the exact machine settings that will generate the tooth form.

There is therefore a tendency to underevaluate oils that have effective EP additives. Firstly, the way to calculate the tooth thickness tolerance seems to need a “manufacturing profile shift coefficient” that isn’t specified in the standard; neither is another standard referred to for this coefficient.

The incredible advances in industrialization and transportation that occurred at the turn of the 20th century resulted in incredible growth for gear makers, but there were significant technical issues.

Giving people the educational tools they need to do their jobs is a necessary ingredient for success. The standard does not give any indications about safety against micropitting frosting. An association is an organization of persons having a common interest. The debate is about what to do.

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