The clear majority of published knowledge about gear manufacturing relates to two main subjects; material quality and tooth accuracy. In most cases, the mechanical accuracy of the gear blank is taken for granted and, after all, preparing a gear blank normally consists of applying basic machine shop skill's taught in high school level vocational technical courses. However, 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.
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