Gears General

A summary of typical gear data:

  • Pitch circle is the theoretical circle of a gear, the circle that rolls without slipping at the same linear speed with the pitch circle of the mating gear.
  • Gear Ratio is number of teeth driven_gear/drive_gear. For example 20/10 is gear ratio 2:1.
  • Involute is the shape of the teeth. It is the curve described by the end of a chord, when the chord is un-winded from a base circle.
  • Base circle, see involute.
  • Module = pitch diameter / number of teeth. The module of mating gears should be the same value.

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