# Question

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?

## Answer to relevant Questions

A screw clamp similar to the one shown in the figure has a handle with diameter 3/16 in made of cold-drawn AISI 1006 steel. The overall length is 3 in. The screw is 7/16 in-14 UNC and is 5 ¾ in long, overall. Distance A is ...A bolted joint is to have a grip consisting of two 14-mm steel plates and one 14R metric plain washer to fit under the head of the M14 ?2 hex-head bolt, 50 mm long. (a) What is the length of the thread LT for this diameter ...A joint has the same geometry as Ex. 8–4, but the lower member is steel. Use Eq. (8–23) to find the spring rate of the members in the grip. Hint: Equation (8–23) applies to the stiffness of two sections of a joint of ...Bolts distributed about a bolt circle are often called upon to resist an external bending moment as shown in the figure. The external moment is 12 kip? In and the bolt circle has a diameter of 8 in. The neutral axis for ...An M30 X 3.5 ISO 8.8 bolt is used in a joint at recommended preload, and the joint is subject to a repeated tensile fatigue load of P = 80 kN per bolt. The joint constant is C = 0.33. Find the load factors and the factor of ...Post your question

0