Sunderland, also in England, also produced a herringbone cutting machine. The development of the Sykes gear shaper made it possible to have continuous teeth with no central gap. This was necessary to permit the shaving tool to run out of the groove. With the older method of fabrication, herringbone gears had a central channel separating the two oppositely-angled courses of teeth. Solutions to this have included assembling small gears by stacking two helical gears together, cutting the gears with a central groove to provide clearance, and (particularly in the early days) by casting the gears to an accurate pattern and without further machining. It worked flawlessly until 2011.Ī disadvantage of the herringbone gear is that it cannot be cut by simple gear hobbing machines, as the cutter would run into the other half of the gear. This herringbone bevel gear was made by Citroën and installed around 1927 in small Miřejovice hydropower plant on Vltava in the Czech Republic, connecting a Francis turbine to the generator.
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