HMC Gears creates giant gear set for power plant

Highway Machine Company's facility south of Princeton features high-tech machining technologies that serve clients across the globe, according to the company.

photo provided

PRINCETON—Highway Machine Company Gears has completed manufacturing a large gear set and pinions for the U.S. Army Corps of Engineers for installation to produce electricity for Ozark Hydroelectric Power Plant in Ozark, Arkansas.

HMC Gears spokesman Ryan Parke said the components are for a speed increaser that connects the turbine to the generator. “The gear and shaft assembly weigh roughly 125,000 pounds and consist of a 174-inch diameter low speed gear and a 143-inch long low speed shaft.

“We also manufactured two low speed pinion shafts, each weighing over 26,000 pounds,” he said. The speed increasers are rated at 33,800 horsepower. “The project presented many challenges, including: the sheer size and weight of the components, the dynamic balancing required of gears and pinions and the mesh testing of these large parts,” he said. “This was a very precise and demanding project that all of us at HMC are proud to have been a part of.”

HMC Gears, founded in 1921 in Gibson County, is family-owned and operated, using state-of-the-art technology and equipment to manufacture large precision components and gearing for clients worldwide. For more information visit

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