Pulleys - Diameters and Speed - Engineering ToolBoxSingle Belt Transmission - one driving pulley and one driven pulley. For a system with two shafts and two pulleys - as indicated with pulley 1 and 2 in the figure above: d1 n1= d2 n2 (1). where. d1 = driving pulley diameter (inch, mm). n1 = revolutions of driving pulley (rpm - rounds per minute). d2 = driven pulley diameter.حزام بكرات rpm,How to Calculate the Speed of Two Different Pulleys | SciencingApr 25, 2017 . For example, suppose the drive-shaft has a diameter of 2.2 inches, and two pulleys driven by the belt have diameters of 4.4 inches and 2.8 inches. . For example, given a drive speed of 750 RPM, the speed of the first pulley = 750/2 = 375 RPM, and the speed of the second pulley = 750/1.27 = 591 RPM.
حزام بكرات rpm