The following data relate to ascrew jack:Pitch of the threaded screw8 mm%3DDiameter of the threaded screw= 40 mmCoefficient of friction between screw andr =0.1LoadAsstfing that the load rotates with the screw,determine theA KNf(i) ratio of torques required to raise andlower the load(ii) efficiency of the machine.

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Answered: The following data relate to a screw…

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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The following parameters are given for the journal bearing. u = 4 ureyn, N = 651 rev/min, W = 851 Ibf (bearing load), d = 3.0 in, c = 0.0025 in, and I = 1.5 in. Determine the following design parameters. (a) Minimum film thickness (ho) (b) Coefficient of friction (f) (c) The torque to overcome friction (T) (d) The power loss to friction (e) Maximum film pressure (pmax)?
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A square thread power screw without a collar is designed to require a torque TR = 16.15 Nm for raising the load while a torque TL = - 0.5 Nm is required to lower the load. Which of the statements is true? %3D The design can be self-locking if a collar is added with T > 0.5 Nm The system is self-locking even without collar friction O The design cab be self-locking if a collar is added with Tc = 0.5 Nm The design cannot be modified to be made self-locking
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Two parts of a machine, both made from steel, are held together by 7 equally-spaced M6 x 1.0 grade 8.8 bolts that are uniformly tightened to provide a total initial clamping force of 60 kN. What wrench torque is required to set the preload on these bolts? Assume a torque factor of 0.18 in your calculations. Express your answer in units of newton meters to a resolution of 0.1 N-m.
a single-start, square-threaded power screw with the following parameters: PARTS A - D circle final answers for each part A - A weight of 1500 N must be lifted. What is the total required torque necessary to lift this weight? Give your answer in units of N m. Part B - if the available power to drive the screw is 1,011 Watts, determine the fastest speed at which the weight can rise. Give your answer in units of mm/s, Part C - The efficiency of the preceding power screw (expressed as a number between 0 and 1, not as a percentage) is ? Part D - Suppose a high-quality thrust bearing was used to eliminate the collar friction. The efficiency of the screw would now be?
5. What do you understand by 'fluctuation of energy' and 'maximum fluctuation of energy'. 6. Define 'coefficient of fluctuation of energy'. 7. Discuss the various types of stresses induced in a flywheel rim. 8. Explain the procedure for determining the size and mass of a flywheel with the help of a turning moment diagram.
The machine component has been fabricated using machining and is made of stainless steel (Sy= 276 MPa, Sut= 568 MPa and f= 0.9). The required reliability is 95% and r= 1 mm. a) If the part is loaded by a cyclic bending moment (Ma = 250 N.m and Mm = 0), determine d for an infinite life with n = 2. b) If a fluctuating torque varying between 50 N.m and 80 N.m is also added to the previous load, determine d for an infinite life with n = 1.2 using Soderberg criterion. 1.2d
Describe the failure of a hollow torque tube. Calculate the forces creating the failure
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