Gear Technology Magazine
www.geartechnology.com/articles/22335-girth-gears-more-than-just-metal-and-teeth

Girth Gears - More than Just Metal and Teeth

May 1, 2017
Large, multi-segmented girth gears do not behave like the relatively compact, rigid, monolithic structures we typically envision when discussing gear manufacturing. Girth gears are very large, non-rigid structures that require special care during the machining of individual mating segments as well as the assembled gear blank itself.