#8: What are V-belt pitch length and datum length?
The length of a V-belt can be specified in several ways, including outside length, effective length, and pitch (or datum) length. Outside length is measured around the belt’s outer diameter with no tension, but is only an approximation and is not useful for sizing or selection. Effective length is measured at the effective outside diameter of the sheaves (pulleys), which is the location on the sheave where the groove’s top width is measured. Alternatively, the pitch length is measured at the pitch diameter of the sheaves.
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