Shigley's Mechanical Engineering Design (McGraw-Hill Series in Mechanical Engineering)
10th Edition
ISBN: 9780073398204
Author: Richard G Budynas, Keith J Nisbett
Publisher: McGraw-Hill Education
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Chapter 17, Problem 16P
To determine
The belt, pulley sizes, and initial tension at installation..
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Homework Question:
Design a compression coupling for a shaft to transmit 1300 N-m. The
allowable shear stress for the shaft and key is 40 MPa and the number of
bolts connecting the two halves are 4. The permissible tensile stress for the
bolt material is 70 MPa. The coefficient of friction between the muff and the
shaft surface may be taken as 0.3.
RB&W11 recommends turn-of-nut from snug fit to preload as follows: 1/3 turn for bolt grips of 1-4 diameters, 1/2 turn for bolt
grips 4-8 diameters, and 2/3 turn for grips of 8-12 diameters. These recommendations are for structural steel fabrication
(permanent joints), producing preloads of 100 percent of proof strength and beyond. Machinery fabricators with fatigue
loadings and possible joint disassembly have much smaller turns-of-nut. The RB&W recommendation enters the nonlinear
plastic deformation zone. The figure shows a cross section of a grade 25 cast-iron pressure vessel, with a torque factor K
of 0.09. Use Eq. (8-27) to estimate the torque necessary to establish the desired preload given that preload F;= 14.4 kip,
bolt stiffness kb = 5.21 x 106 lbf/in, number of threads N=11, and material stiffness km = 8.95 × 106 lbf/in.
in-11 UNCX 2 in grade 5
finished hex head bolt
in
in
162
No. 25 CI
Determine the torque necessary to establish the desired preload and the turn of the nut in…
RB&W¹1 recommends turn-of-nut from snug fit to preload as follows: 1/3 turn for bolt grips of 1-4 diameters, 1/2 turn for bolt
grips 4-8 diameters, and 2/3 turn for grips of 8-12 diameters. These recommendations are for structural steel fabrication
(permanent joints), producing preloads of 100 percent of proof strength and beyond. Machinery fabricators with fatigue
loadings and possible joint disassembly have much smaller turns-of-nut. The RB&W recommendation enters the nonlinear
plastic deformation zone. The figure shows a cross section of a grade 25 cast-iron pressure vessel, with a torque factor K
of 0.09. Use Eq. (8-27) to estimate the torque necessary to establish the desired preload given that preload F; = 14.4 kip,
bolt stiffness kb = 5.21 x 106 lbf/in, number of threads N = 11, and material stiffness km = 8.95 × 106 lbf/in.
in-11 UNCX 2+ in grade 5
finished hex head bolt
in
No. 25 CI
Determine the torque necessary to establish the desired preload and the turn of the nut in…
Chapter 17 Solutions
Shigley's Mechanical Engineering Design (McGraw-Hill Series in Mechanical Engineering)
Ch. 17 - Example 17-2 resulted in selection of a 10-in-wide...Ch. 17 - A 6-in-widc polyamide F-l flat belt is used to...Ch. 17 - Prob. 3PCh. 17 - A flat-belt drive is to consist of two...Ch. 17 - In solving problems and examining examples, you...Ch. 17 - Return to Ex. 17-1 and complete the following. (a)...Ch. 17 - Prob. 7PCh. 17 - Prob. 8PCh. 17 - Prob. 9PCh. 17 - Two shafts 20 ft apart, with axes in the same...
Ch. 17 - Prob. 11PCh. 17 - Prob. 12PCh. 17 - A designer has to select a metal-belt drive to...Ch. 17 - Prob. 14PCh. 17 - Prob. 15PCh. 17 - Prob. 16PCh. 17 - Prob. 17PCh. 17 - Two B85 V belts are used in a drive composed of a...Ch. 17 - Prob. 19PCh. 17 - Prob. 20PCh. 17 - The geometric implications of a V-flat drive are...Ch. 17 - A 2-hp electric motor running at 1720 rev/min is...Ch. 17 - The standard roller-chain number indicates the...Ch. 17 - Prob. 24PCh. 17 - A double-strand no. 60 roller chain is used to...Ch. 17 - A four-strand no. 40 roller chain transmits power...Ch. 17 - Prob. 27PCh. 17 - Prob. 28PCh. 17 - Prob. 29PCh. 17 - Prob. 30PCh. 17 - Prob. 31PCh. 17 - Prob. 32PCh. 17 - Prob. 33PCh. 17 - For Prob. 17-29 estimate the elongation of the...
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