# Question: The press shown for Prob 8 5 has a rated load of 5000

The press shown for Prob. 8–5 has a rated load of 5000 lbf. The twin screws have Acme threads, a diameter of 3 in, and a pitch of ½ in. Coefficients of friction are 0.05 for the threads and 0.06 for the collar bearings. Collar diameters are 5 in. The gears have an efficiency of 95 percent and a speed ratio of 75:1. A slip clutch, on the motor shaft, prevents overloading. The full-load motor speed is 1720 rev/min.

(a) When the motor is turned on, how fast will the press head move?

(b) What should be the horsepower rating of the motor?

(a) When the motor is turned on, how fast will the press head move?

(b) What should be the horsepower rating of the motor?

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