Gear - The Module System

The Module System

Countries which have adopted the metric system generally use the module system. As a result, the term module is usually understood to mean the pitch diameter in millimeters divided by the number of teeth. When the module is based upon inch measurements, it is known as the English module to avoid confusion with the metric module. Module is a direct dimension, whereas diametral pitch is an inverse dimension (like "threads per inch"). Thus, if the pitch diameter of a gear is 40 mm and the number of teeth 20, the module is 2, which means that there are 2 mm of pitch diameter for each tooth.

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Geared - The Module System
... Countries which have adopted the metric system generally use the module system ... As a result, the term module is usually understood to mean the pitch diameter in millimeters divided by the number of teeth ... When the module is based upon inch measurements, it is known as the English module to avoid confusion with the metric module ...

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