Using a standard gear system, design a pair of spur gears to connect a 100-hp, 3600-rpm motor to a 900-rpm load shaft. Shock loading from the motor and driven machine is negligible. The center...

Using a standard gear system, design a pair of spur gears to connect a 100-hp, 3600-rpm motor to a 900-rpm load shaft. Shock loading from the motor and driven machine is negligible. The center distance is to be as small as reasonably possible. A life of 5 years of 2000 hours/year operation is desired, but full power will be transmitted only about 10% of the time, with half power the other 90%. Likelihood of failure during the 5 years should not exceed 10%.