1. A line shaft runs at 360 rpm. An 18" pulley on the shaft is belt connected to a 12" pulley on the counter shaft. From a 15" pulley on the counter shaft, motion is transmitted to the machine. Compute the required diameter of the pulley on the machine to give a spindle speed of 660 rpm.
a. D1N1 = N2D2
D1 = line shaft pulley diameter
N1 = line shaft rpm
D2 = counter shaft pulley #1 diameter
N2 = counter shaft rpm
18(360) = 12N2
N2 = 540 rpm
b. D3N3 = D4N4
D3 = counter shaft pulley #2 diameter
N2 = N3 = counter shaft rpm
D4 = machine pulley diameter
N4 = machine rpm
15(540) = D4(660)
D4 = 12.27 inches answer
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