![]() ![]() The major difference between metric and imperial gearing is in length units, however, while tools such as hobs and shafts, etc. ![]() Also, while Module is internationally widely used, DP is still heavily used in the US, but DP can be approximated to Module by the formula, Module = 25.4/DP.Īs mentioned before, gears using Module as the unit of Pitch are called Metric Gears, conversely, gears using DP as the unit of Pitch are called Imperial Gears. The module is set to be the unit to indicate the pitch of the gear teeth by ISO, but there are other units such as DP (diametral pitch). For example, if the module is 2, the pitch is 6.2832mm, and if the module is 3, the pitch is 9.4248mm. When the unit of Module is used, the pitch can be computed as the multiple of π. Traditionally metric means a measurement method based on meter, but when used in sentences as metric gears, it means the sizes of gears are based on the pitch (size) in the unit called module (m).
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