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  • Comparison Table of Module, Diametral Pitch and Circular Pitch (.pdf)
    Gear pitch can be defined as Diametral Pitch, Module or Circular Pitch. The enclosed table details the common sizes for all three pitch profiles and their equivalency to the other pitch profiles.
  • Gear Tooth Form
    Gear tooth geometry is determined primarily by pitch, depth, and pressure angle. Standard pitches are usually whole numbers when measured as diametral pitch , the ratio of the number of teeth to the pitch diameter in inches. Coarse-pitch gearing has teeth larger than 20 diametral pitch -- usually
  • Gear Design: Breaking the status quo
    with different numbers of teeth. And gears made by the same tool work together, which provides interchangeability and low tool inventory. Hobbing also simplifies gear design. Parameters such as diametral pitch or module, profile angle, addendum, whole depth, and fillet-radius proportions define

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