A power screw assembly with single acme threads is to be used to raise a load of 3000 lbf at an axial displacement rate of 2.5 in/s. The steel screw has a nominal diameter of 2 inches and its threads are oil lubricated. The screw is paired with a bronze nut; axial support is provided by a thrust collar with a bronze thrust washer that is secured to the frame. The mean radius of the collar is 1.1 inches. A gear motor is utilized to drive the power screw assembly. a. What is the minimum power requirement for the motor? b. Do you expect the power screw assembly to be self-locking? c. Calculate the efficiency of the screw assembly.
A power screw assembly with single acme threads is to be used to raise a load of 3000 lbf at an axial displacement rate of 2.5 in/s. The steel screw has a nominal diameter of 2 inches and its threads are oil lubricated. The screw is paired with a bronze nut; axial support is provided by a thrust collar with a bronze thrust washer that is secured to the frame. The mean radius of the collar is 1.1 inches. A gear motor is utilized to drive the power screw assembly. a. What is the minimum power requirement for the motor? b. Do you expect the power screw assembly to be self-locking? c. Calculate the efficiency of the screw assembly.
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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A power screw assembly with single acme threads is to be used to raise a load of 3000 lbf at an axial displacement rate of 2.5 in/s. The steel screw has a nominal diameter of 2 inches and its threads are oil lubricated. The screw is paired with a bronze nut; axial support is provided by a thrust collar with a bronze thrust washer that is secured to the frame. The mean radius of the collar is 1.1 inches. A gear motor is utilized to drive the power screw assembly.
a. What is the minimum power requirement for the motor?
b. Do you expect the power screw assembly to be self-locking?
c. Calculate the efficiency of the screw assembly.
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