A 12 hp motor is used to raise and lower a load W = 5000 lbf using a single threaded Acme screw(Course series-UNF) with a nominal major diameter of 1.5 inches that rotates during actuation asshown below. The coefficient of friction for the screw is f = 0.06 and friction due to the collar isnegligible f≈ 0.(a) The lead (1), the lead angle (2) and the mean diameter (dm)(b) Determine the rate in inches per second that the load can be raised and the torque required(T[lb-ft]) (rpm)to prevent overhauling of the screw. Note: hp=5252(c) Assuming a collar diameter of d = 1.75 in., what coefficient of collar friction (fc) wouldbe required to prevent overhauling and how much would this reduce the efficiency ofraising the load?(d) Determine the von Mises's stress at the thread root critical location during lifting of theload.W = 5000 lbfMotor

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shown below. The coefficient of friction for the screw is f = 0.06 and friction du negligible f≈ 0. (a) The lead (1), the lead angle (2) and the mean diameter (dm) (b) Determine the rate in inches per second that the load can be raised and the (T[lb-ft]) (rpm) to prevent overhauling of the screw. Note: hp = 5252 (c) Assuming a collar diameter of de = 1.75 in., what coefficient of collar fric be required to prevent overhauling and how much would this reduce th raising the load? (d) Determine the von Mises's stress at the thread root critical location durin load.

shown below. The coefficient of friction for the screw is f = 0.06 and friction du negligible f≈ 0. (a) The lead (1), the lead angle (2) and the mean diameter (dm) (b) Determine the rate in inches per second that the load can be raised and the (T[lb-ft]) (rpm) to prevent overhauling of the screw. Note: hp = 5252 (c) Assuming a collar diameter of de = 1.75 in., what coefficient of collar fric be required to prevent overhauling and how much would this reduce th raising the load? (d) Determine the von Mises's stress at the thread root critical location durin load.

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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Clutches, Brakes, Couplings, and Flywheels

The clutch is described as a machine element used to connect or disconnect two shafts together to transmit torque or power. The clutch works on the principles of friction. The clutch is commonly used in automobiles to transfer power from the driving shaft to the driven shaft.

Question

A 12 hp motor is used to raise and lower a load W = 5000 lbf using a single threaded Acme screw
(Course series-UNF) with a nominal major diameter of 1.5 inches that rotates during actuation as
shown below. The coefficient of friction for the screw is f = 0.06 and friction due to the collar is
negligible f≈ 0.
(a) The lead (1), the lead angle (2) and the mean diameter (dm)
(b) Determine the rate in inches per second that the load can be raised and the torque required
(T[lb-ft]) (rpm)
to prevent overhauling of the screw. Note: hp
=
5252
(c) Assuming a collar diameter of d = 1.75 in., what coefficient of collar friction (fc) would
be required to prevent overhauling and how much would this reduce the efficiency of
raising the load?
(d) Determine the von Mises's stress at the thread root critical location during lifting of the
load.
W = 5000 lbf
Motor

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