Variable speed pulleys: A simple and economical solution for rapidly and continuously varying the speed of two shafts, without the need to stop the transmission. The purpose of a variable speed pulley is to change the speed of a rotating shaft. The drive system requires two pulleys: the variable speed pulley mounted on the drive shaft and a fixed diameter pulley mounted on the driven shaft. The drive shaft is the source of power, like an engine, and the driven shaft is the one that requires a gear change. A belt is used to transfer power from the drive shaft to the driven shaft.
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