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Home » Authors » Robert Errichello
Robert Errichello

Robert Errichello

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.
Articles

ARTICLES

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Defining the Tooth Flank Temperature in High-Speed Gears

May 19, 2022
Robert Errichello, John B. Amendola, and John B. Amendola III

The objective of this paper is to improve the methodology for determining the tooth flank temperature. Two methods are proposed for assessing scuffing risk when applying AGMA 925 for high-speed gears. Both methods provide similar results.


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The “Metallurgical Notch” in Type B Induction Hardened Gears

November 1, 2021
Robert Errichello
Advantages of induction hardening over carburizing, as prepared for the AGMA Metallurgy Committee.
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History of the AGMA J-FACTOR

September 1, 2020
Robert Errichello
I felt a tap on my shoulder. Turning, I saw the chief draftsman who said, "You're in charge of gears." And he walked away. Dumbfounded, I stared at the back of his head, and sat down at my drafting board. It was November, 1963, shortly after JFK was assassinated, and after I was discharged from the U.S. Army.
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Ten Top Books for Gear Failure Analysis

June 1, 2020
Robert Errichello
The purpose of this article is to provide an overview of proven books or standards dealing with failure analysis. Following you will find a short description of ten books or standards. At the end of the document you will find an overview and a detailed reference list.
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Lubrication: Viscosity and Macropitting

September 1, 2018
Robert Errichello
A reader asks: Is the ISO VG 320 adequate, or should a higher viscosity grade be used? How can we stop macropitting in gear teeth?
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Critique of the ISO 15144-1 Method to Predict the Risk of Micropitting

March 1, 2016
Robert Errichello
There exists an ongoing, urgent need for a rating method to assess micropitting risk, as AGMA considers it a "a very significant failure mode for rolling element bearings and gear teeth - especially in gearbox applications such as wind turbines."
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Elastohydrodynamic Lubrication (EHL): A Review

July 1, 2015
Robert Errichello
This review of elastohydrodynamic lubrication (EHL) was derived from many excellent sources (Refs. 1–5). The review of Blok’s flash temperature theory was derived from his publications (Refs. 6–9). An excellent general reference on all aspects of tribology is the Encyclopedia of Tribology (Ref. 10).
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Measuring Residual Stress in Gears

March 1, 2015
Robert Errichello
I have heard that X-ray diffraction does not tell the whole story and that I should really run a fatigue test. I understand this may be the best way, but is there another method that gives a high degree of confidence in the residual stress measurement?
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Lubrication Lexicon

September 1, 2014
Robert Errichello
I must confess I sometimes find myself a bit dazed when discussing lubrication issues with either staff or vendors. The terminology seems to be all over the lot, with some terms having double meanings. Can you help cut through the confusion?
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The Pros and Cons of Fully Ground Root Fillets

August 1, 2014
Robert Errichello
For maximum life in carburized and ground gearing, I have been advised that fully grinding a radius into the root gives maximum resistance against fatigue failures. Others have advised that a hobbed and unground radius root form is best. Which is best, and why?
Read More
View All Articles by Robert Errichello
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