See also: Spiral Valve

The spiral gear is a Hammerite innovation first successfully developed by Master Forger Dovetail. Its application with "winding machines" suggests that it is a type of worm screw: A gear meshed with such a device is incapable of movement unless the screw is turned and can thus retain tremendous pressure without unwinding.[1][2]

Other real-world spiral gears include the spiral bevel gear (however, this is designed for cars),[3] and Crossed helical gear, designed to be used with a gear that works on a crossed axis.[4]


  1. Unused38
  2. Worm drive
  3. Spiral bevel gear
  4. Crossed helical gear

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