Spiroid gears: “A family of gears in which the tooth design is in an intermediate zone between bevel-, worm-, and face-gear design. The Spiroid design is patented by the Spiroid Division of Illinios Tool Works (ITW), Chicago, Illinios.” -Darle W. Dudley’s “Handbook of Practical Gear Design” To those in search of a concise, technical definition of Spiroid gearing, the one [...]