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Very economical and reliable method of speed change
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Allows the user to find the ideal speed without changing sheaves and belts; especially important on applications where final driven speed is critical and difficult to attain with two fixed-diameter sheave
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Speed range within the ratio is infinite, and speed change is accomplished quickly, while the drive is running
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Can be used as a highly efficient belt tensioner, with no adjustment necessary
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Offers a form of “soft start,” eliminating belt slip and premature wear
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On belt drives with inherent high torque start-up requirements