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This podcast episode dives deep into the persistent and often misunderstood issue of micropitting in gears, guided by expert insights from Ben Wainwright. The conversation begins by defining micropitting and examining how it manifests in real-world applications, asking whether it remains a practical concern in modern gear systems and what fundamental factors—such as lambda ratio, surface roughness, and contact conditions—drive its formation. We explore how micropitting should be properly characterized, which surface finishes are most effective at reducing risk, and the complex role lubricants play, including whether antiwear and EP additives mitigate or inadvertently promote damage. The discussion then turns to testing: how micropitting is currently evaluated, whether today’s tests truly reflect field failures, and what an ideal test might look like if designed from first principles. The episode closes with practical guidance for gearbox designers, common misconceptions still seen in industry, trusted rules of thumb, and a forward-looking question on whether micropitting is something we will ultimately engineer out—or simply continue to manage. 

Our Guest:

Benjamin Wainwright completed his studies in mechanical engineering at Imperial college London in 2017. During his undergraduate studies he was heavily involved in the maintenance of the 1902 Car mascot of the City and Guilds. This along with a keen interest in the fundamentals of engineering inspired Ben to take on a PhD in the Imperial College Tribology Group focusing on surface fatigue of gear and bearing applications. Ben was awarded his PhD in 2022 and shortly after continued his career within the R&D department of PCS Instruments. Here, together with his fellow R&D engineers, he has contributed to the development and release of a system to allow research of electrified contacts as well as high speed twin disc machine focusing on high speed EHL.

Marc Ingram has over 10 years experience working in Tribology.  His masters degree in Chemistry and PhD in Engineering (Tribology) helps him easily bridge the gap that so often exists between lubricant formulator and field/test engineer.  He has worked with all major oil and additive companies after a successful career at Imperial College, PCS Instruments and Afton Chemical.  Marc has extensive knowledge of all tribology test methods inc

For more information on STLE, please visit https://www.stle.org/ If you have an idea for our podcast, or interested in being a guest, please Email STLE Director of Professional Development Robert Morowczynski at [email protected] . Also, we love your feedback, please take a minute to provide us with your thoughts at Perfecting Motion Podcast Feedback or Email us at [email protected].