A four-strand no. 40 roller chain transmits power from a 21-tooth driving sprocket to an 84-tooth driven sprocket. The angular speed of the driving sprocket is 2000 rev/min.
(a) Estimate the chain length if the center-to-center distance has to be about 20 in.
(b) Estimate the tabulated horsepower entry H′tab for a 20 000-h life goal.
(c) Estimate the rated (allowable) horsepower that would appear in Table 17–20 for a 20 000-h life.
(d) Estimate the tension in the chain at the allowable power.