DESIGN OF MACHINERY-CONNECT ACCESS
6th Edition
ISBN: 9781260431261
Author: Norton
Publisher: MCG
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Textbook Question
Chapter 2, Problem 2.8P
Identify the items in Figure P2-1 as
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Chapter 5 Shearing Forces and Bending Moments in Beams
Problems for Figures P5-77 through P5-84
Each figure shows a mechanical device in which one or more
forces are applied parallel to and away from the axis of the
main, beam-like part. The devices are supported by bearings
at the locations marked with an x, which can provide reaction
forces in any direction perpendicular to the axis of the beam.
One of the bearings has the capability of resisting horizon-
tally directed forces. For each figure, the objectives are the
following:
1. Break the compound beam into parts consisting of each
of the straight components.
2. Show the complete free-body diagram of each com-
ponent part including all external loads and internal
forces and bending moments required to keep the part in
equilibrium.
3. For the main, horizontal part only, draw the complete
shearing force and bending moment diagrams. Refer to
Section 5-10 for examples.
Dimensions in mm
-425
- 250
800 N
150
Project 5:
Jack screw works on principle that thread is rotating and screws are lifting/lowering a load, whereas lead screw
is used to convert rotational motion into linear motion as in 3D printers (see Figure.7). You are working in
company that designs screw jack and lead screw for 3D printers and your role is to determine operating
efficiency of both mechanisms and provide detailed report of your work.
Lead Seren
Figure.7: Screw Jack (left) and 3D printer's lead screw (right)
You have been given the following information;
Lead screw has square threads with a pitch of 2.3 mm and a mean diameter of 16 mm. The
coefficient of friction is 0.25 and the lead screw is loaded at 5 kN and assume the motor torque input
is 25 N.m.
A screw jack has a thread with a 6. 5 mm and a mean diameter of 30 mm. The coefficient of friction is
0.20 and jack is loaded at8 kN upward with a handle of 700 mm.
500 mm
B
B2
A2
O2,
61.9292
X-line
The slider-crank mechanism has a stroke of 500 mm. The required advance-to-return ratio is 1.80.
The crank angle during the advance stroke (a), crank angle during the return stroke (B), crank link
length (r2), and coupler length (ra) is. (See Theory of Machines and Mechanism, 5th Edition, Problem
1.31) (NOTE: Use the angle for the X-Line as shown)
(a) a=231.43°, B=128.57°, r2-301.872 mm, r3=412.751 mm
(b) a=128.57°, B=231.43°, r2=223.875 mm, r3=340.409 mm
(c) a=231.43°, B=128.57°, r2-223.875 mm, r3-340.409 mm
(d) a=128.57°, B=231.43°, r2=191.751 mm, r3-387.233 mm
Chapter 2 Solutions
DESIGN OF MACHINERY-CONNECT ACCESS
Ch. 2 - Find three (or other number as assigned) of the...Ch. 2 - How many DOF do you have in your wrist and hand...Ch. 2 - How many DOF do the following joints have? Your...Ch. 2 - How many DOF do the following have in their normal...Ch. 2 - Are the joints in Problem 2-3 force closed or form...Ch. 2 - Describe the motion of the following items as pure...Ch. 2 - Calculate the mobility of the linkages assigned...Ch. 2 - Identify the items in Figure P2-1 as mechanisms,...Ch. 2 - Use linkage transformation on the linkage of...Ch. 2 - Prob. 2.10P
Ch. 2 - Use number synthesis to find all the possible link...Ch. 2 - Prob. 2.12PCh. 2 - Use linkage transformation to create a 1-DOF...Ch. 2 - Use linkage transformation to create a 1-DOF...Ch. 2 - Calculate the Grashof condition of the fourbar...Ch. 2 - Prob. 2.16PCh. 2 - Describe the difference between a cam-follower...Ch. 2 - Examine an automobile hood hinge mechanism of the...Ch. 2 - Find an adjustable arm desk lamp of the type shown...Ch. 2 - The torque-speed curve for a 1/8 hp permanent...Ch. 2 - Find the mobility of the mechanisms in Figure...Ch. 2 - Find the Grashof condition and Barker...Ch. 2 - Find the rotatability of each loop of the...Ch. 2 - Find the mobility of the mechanisms in Figure...Ch. 2 - Find the mobility of the ice tongs in Figure P2-6:...Ch. 2 - Prob. 2.26PCh. 2 - Prob. 2.27PCh. 2 - Find the mobility of the corkscrew in Figure P2-9.Ch. 2 - Figure P2-10 shows Watts sun and planet drive that...Ch. 2 - Figure P2-11 shows a bicycle handbrake lever...Ch. 2 - Figure P2-12 shows a bicycle brake caliper...Ch. 2 - Find the mobility, the Grashof condition, and the...Ch. 2 - The approximate torque-speed curve and its...Ch. 2 - Prob. 2.34PCh. 2 - Prob. 2.35PCh. 2 - Sketch the equivalent linkage for the cam and...Ch. 2 - Describe the motion of the following rides,...Ch. 2 - For the mechanism in Figure P2-1 a, number the...Ch. 2 - Repeat Problem 2-38 for Figure P2-1b.Ch. 2 - Repeat Problem 2-38 for Figure P2-1c.Ch. 2 - Prob. 2.41PCh. 2 - Find the mobility, the Grashof condition, and the...Ch. 2 - Find the mobility, the Grashof condition, and the...Ch. 2 - Figure P2-20 shows a Rube Goldberg mechanism that...Ch. 2 - All the eightbar linkages in Figure 2-11 part 2...Ch. 2 - Prob. 2.46PCh. 2 - Prob. 2.47PCh. 2 - Find the mobility of the mechanism shown in Figure...Ch. 2 - Find the mobility of the mechanism shown in Figure...Ch. 2 - Find the mobility of the mechanism shown in Figure...Ch. 2 - Find the mobility of the mechanism shown in Figure...Ch. 2 - Prob. 2.52PCh. 2 - Prob. 2.53PCh. 2 - Repeat Problem 2-38 for Figure P2-1f.Ch. 2 - Repeat Problem 2-38 for Figure P2-1g.Ch. 2 - For the example linkage shown in Figure 2-4 find...Ch. 2 - For the linkage shown in Figure 2-5b find the...Ch. 2 - Prob. 2.58PCh. 2 - Figure P2-21b shows a mechanism. Find its mobility...Ch. 2 - Prob. 2.60PCh. 2 - Figure P2-21 d shows a log transporter. Draw a...Ch. 2 - Figure P2-21e shows a plow mechanism attached to a...Ch. 2 - Figure P2-22 shows a Hart inversor sixbar linkage....Ch. 2 - Figure P2-23 shows the top view of the partially...Ch. 2 - Figure P2-24a shows the seat and seat-back of a...Ch. 2 - Figure P2-24b shows the mechanism used to extend...Ch. 2 - Figure P2-24b shows the mechanism used to extend...Ch. 2 - Figure P2-25 shows a sixbar linkage. Is it a Watt...Ch. 2 - Use number synthesis o find all the possible link...Ch. 2 - Use number synthesis to find all the possible link...Ch. 2 - Prob. 2.71PCh. 2 - For the mechanism in Figure P2-26, number the...Ch. 2 - Figure P2-27 shows a schematic of an exercise...Ch. 2 - Calculate the mobility of the linkage in Figure...Ch. 2 - Calculate the Grashof condition of the fourbar...Ch. 2 - The drum brake mechanism in Figure P2-4g is a...
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- Please solve 4 (a and b) (subject - machine design 3)arrow_forwardAim: To conduct a full kinematic analysis and calculate dynamic reaction forces in a linkage mechanism, calculate instantaneous torque, required to drive the mechanism and to present the results of the case study in a clear reporting format. Introduction: Figure 1 shows a pumpjack operating at an oil well. Its representation as a linkage is also shown in Figure 1. The pumpjack is driven by a motor attached to crank OA. A constant torque T is applied to the crank and the crank rotates at a constant angular velocity ???. A force P is applied vertically downwards at the end of the walking beam BD, which has its centre of mass at point G. To design the mechanism, a careful kinematic analysis of the mechanism needs to be conducted. To avoid mechanical failure and to provide adequate support to the mechanism, the engineer needs to analyse the reaction forces in the joints. Masses of links OA and AB are assumed to be smaller in comparison with the mass of BD and are ignored in the analysis.…arrow_forwardPlease answer this Thanks!An important property in mechanism analysis is the number of degrees of freedom of the linkage? BLANK is the number of independent inputs required to precisely position all links of the mechanism with respect to the ground.arrow_forward
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