Robert Errichello
heads
his own gear consulting firm,
GEARTECH, and is founder
of GEARTECH Software,
Inc. He has over 50 years of
industrial experience. He has
been a consultant to the gear
industry for the past 37 years
and to over 50 wind turbine manufacturers,
purchasers, operators, and researchers.
He has taught courses in material science,
fracture mechanics, vibration, and machine
design at San Francisco State University and
the University of California at Berkeley. He
has presented numerous seminars on design,
analysis, lubrication, and failure analysis of
gears and bearings to professional societies,
technical schools, and the gear, bearing,
and lubrication industries. A graduate of the
University of California at Berkeley, Errichello
holds BS and MS degrees in mechanical
engineering and a Master of Engineering
degree in structural dynamics. He is a member
of several AGMA Committees, including the
AGMA Gear Rating Committee, AGMA/AWEA
Wind Turbine Committee, ASM International,
ASME Power Transmission and Gearing
Committee, STLE, NREL GRC, and the Montana
Society of Engineers. Bob has published over
80 articles on design, analysis, and application
of gears, and is the author of three widely used
computer programs for design and analysis
of gears. He is technical editor for GEAR
TECHNOLOGY and STLE Tribology Transactions.
Errichello is recipient of the AGMA TDEC
Award, the AGMA E.P. Connell Award, the
AGMA Lifetime Achievement Award, the STLE
Wilbur Deutch Memorial Award, the 2015
STLE Edmond E. Bisson Award, and the AWEA
Technical Achievement Award.
Geoffrey Parrish has updated and expanded his previous book: The Influence of Microstructure on the Properties of Case-Carburized Components. It now contains at least twice the material. References and bibliography include 449 citations.
Photography is an essential part of gear failure analysis. It not only provides a fast, convenient way to accurately document the appearance of gear failure, but also is an effective diagnostic tool because the magnification obtained through photographic enlargement and slide projection often discloses evidence that may have been missed if the gears were not photographed.
From time to time, the editors of "Shop Floor" receive correspondence from readers relating to particular articles they have written for past issues. As one of the purposes of this column is to provide a forum for the exchange of ideas, we reproduce here two of these letters and their replies. The subject of the first is the functional measurement of gears. (See Gear Technology, Sept/Oct, 1991, p. 17) Robert E. Smith writes the reply.
When I was new to gear engineering, I found the array of gear literature scare, and the information scattered and conflicting. After investigating the materials available, I set the goal of creating an annotated listing of the references. There are many valuable resources, but for this article I have selected ten of the best. These references, in my opinion, are the most useful, and cover the scope while minimizing redundancy.
A simple, closed-form procedure is presented for designing minimum-weight spur and helical gearsets. The procedure includes methods for optimizing addendum modification for maximum pitting and wear resistance, bending strength, or scuffing resistance.
This is the final part of a three-part series on the basics of gear lubrication. It covers selection of lubricant types and viscosities, the application of lubricants, and a case history
What follows is Part 2 of a three-part article covering the principles of gear lubrication. Part 2 gives an equation for calculating the lubricant film thickness, which determines whether the gears operate in the boundary, elastohydrodynamic, or full-film lubrication regime. An equation for Blok's flash temperature, which is used for predicting the risk of scuffing, is also given.
This is a three-part article explaining the principles of gear lubrication. It reviews current knowledge of the field of gear tribology and is intended for both gear designers and gear operators. Part 1 classifies gear tooth failures into five modes and explains the factors that a gear designer and operator must consider to avoid gear failures. It defines the nomenclature and gives a list of references for those interested in further research. It also contains an in-depth discussion of the gear tooth failure modes that are influenced by lubrication and gives methods for preventing gear tooth failures.