Shigley's Mechanical Engineering Design (McGraw-Hill Series in Mechanical Engineering)
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 1, Problem 31P

Generally, final design results are rounded to or fixed to three digits because the given data cannot justify a greater display. In addition, prefixes should be selected so as to limit number strings to no more than four digits to the left of the decimal point. Using these rules, as well as those for the choice of prefixes, solve the following relations:

(a)    σ = M/Z, where M = 1770 lbf · in and Z = 0.934 in3.

(b)    σ = F/A, where F = 9440 lbf and A = 23.8 in2.

(c)    y = Fl3/3EI, where F = 270 lbf, l = 31.5 in, E = 30 Mpsi, and I = 0.154 in4.

(d)    θ = Tl/GJ, where T = 9 740 lbf · in, l = 9.85 in, G = 11.3 Mpsi, and J = πd4/32 with d = 1.00 in.

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2:01 ul 4G 4. A sulms.su.edu.om While constructing a building, an engineer need to fix two steel beams together using a bracket as shown in Figure 1. Using absolute coordinate system, construct a G-code program for drilling hole number 3 only. To remove the metal chips the hole should be done in three equal steps. During the drilling, coolant should be on before spindle starts and stop after spindle stops. The spindle speed set to 1750 RPM. Drilling bit in rack number 2 and it should be 1 mm over the work piece. Drilling feed rate is 20 mm/min. Explain each code used in the program in a column 57.5- 12.5 Hole (4) Hole (3) 30 Hole (1) Hole (2) ΧΟ Υ0ΖΟ All dimensions shown are in mm Figure 1 B. -> 28 •..

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Shigley's Mechanical Engineering Design (McGraw-Hill Series in Mechanical Engineering)

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