A circle tangent to the bottom of the spaces between teeth on a gear wheel. |

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A circle tangent to the bottom of the spaces between teeth on a gear wheel. |

## Related Terms |

## BASE CIRCLEThe circle on a gear such that each tooth-profile curve is an involute of it. |

## INCIDENCEl. Partial coincidence, as a circle and a tangent line. 2. The impingement of a ray on a surface |

## ADDENDUM CIRCLEThe circle on a gear passing through the tops of the teeth. |

## ANGULAR PITCHThe angle determined by the length along the pitch circle of a gear between successive teeth. |

## TANGENTA line that touches but does not cut the circumference of a circle. |

## OBLIQUE EQUATORA great circle the plane of which is perpendicular to the axis of an oblique projection. An oblique equator serves as the origin for measurement of oblique latitude. On an oblique Mercator map projection, the oblique equator is the tangent great circle. |

## DEDENDUMThe difference between the radius of the pitch circle of a gear and the radius of its root circle. |

## DIAMETRAL PITCHA gear tooth design factor expressed as the ratio of the number of teeth to the diameter of the pitch circle measured in inches. |

## CYCLOIDAL GEAR TEETHGear teeth whose profile is formed by the trace of a point on a circle rolling without slippage on the outside or inside of the pitch circle of a gear; now used only for clockwork and timer gears. |

## SIMPLE HARMONIC MOTIONThe projection of uniform circular motion on a diameter of the circle of such motion. The combination of two or more simple harmonic motions results in COMPOUND HARMONIC MOTION. |

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