I was invited by Tom Astrene of TLT to write a response to the July 2010 TLT article (Ref. 1). My rebuttal — “In Search of a Fatigue Limit: A Critique of ISO Standard 281:2007” — was published in Tribology and Lubrication Engineering, TLT, August 2010 edition (Ref. 10). While this article is also available online, I will attempt to summarize the essence of my response.

For the lubrication of open gear drives used in different industrial applications such as cement and coal mills, rotary furnaces, or where the sealing conditions are difficult, semi-fluid greases are often used in preference to fluid oils. For girth gear applications the greases are used with a splash or spray lubrication system. The selection of such greases influences pitting lifetime and the load-carrying capacity of the gears, as well as wear behavior

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Although David Korins had an impressive resume of Broadway, film, television and music credits, the New York-based production designer had something to prove when interviewing for the pop culture phenomenon Hamilton. “I prepped for the interview like crazy, sketching out my ideas, presenting a scene breakdown, basically doing everything I could short of begging for the job,” Korins said. “Lin Manuel Miranda (the show’s creator and star) had developed an incredibly effective blueprint. I just wanted the opportunity to help tell his story.”

Referencing a June 2014 Article, “High Gear Ratio Epicyclic Drives Analysis,” by Dr. Alex Kapelevich: I have designed a small compound epicyclic gearbox with common planets. Sun = 10 teeth Planet = 14 teeth Ring Gear stationary = 38 teeth Ring gear output = 41 teeth profile shifted onto a 38 tooth pitch diameter. Carriers are simply cages for the planet alignment and location. According to your article, and according to my calculations and the prototype I have built, my inputto- output ratio is a reduction of 65.6:1. I am using a ~ VG1 viscosity grease and Nylatron materials for the gears and carriers.

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Almost daily I’m asked about the switched reluctance motor (SRM) — a motor that was invented more than 100 years ago. But only in the 1980s did it ...