3 The press shown below has a rated load of 25 kN The twin screws have Acme threads, a diameter of 56 mm, and a pitch of 5.5 mm. Coefficients of friction are 0.05 for the threads and 0.08 for the collar bearings. Collar diameters are 88 mm. The gears have an efficiency of 95 percent and a speed ratio of 60: 1. The full-load motor speed is 1750 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? Motor Bearings Spur gears Bronze bushings Foot Worm Collar bearing

3 The press shown below has a rated load of 25 kN The twin screws have Acme threads, a diameter of 56 mm, and a pitch of 5.5 mm. Coefficients of friction are 0.05 for the threads and 0.08 for the collar bearings. Collar diameters are 88 mm. The gears have an efficiency of 95 percent and a speed ratio of 60: 1. The full-load motor speed is 1750 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? Motor Bearings Spur gears Bronze bushings Foot Worm Collar bearing

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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Concept explainers

Metrology of Screw Threads

Screw threads are a series of ridges having the profile of a helix. This helix profile runs continuously along the length of a uniform solid or a hollow bar of a circular cross-section at periodic intervals. These helix ridges are also formed over a conical bar. These continuous helical ridges are termed threads.

Question

3
The press
shown below has a rated load of 25 kN The twin screws have Acme
threads, a diameter of 56 mm, and a pitch of 5.5 mm. Coefficients of friction are
0.05 for the threads and 0.08 for the collar bearings. Collar diameters are
88 mm. The gears have an efficiency of 95 percent and a speed ratio of 60: 1.
The full-load motor speed is 1750 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?
Bearings
Motor
Spur gears
Bronze
bushings
(مزدوج)
Foot
Worm
Collar
bearing

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