Student Workbook and Project Manual for Hoffman/Hopewell's Precision Machining Technology
3rd Edition
ISBN: 9798214105710
Author: Peter J. Hoffman and Eric S. Hopewell
Publisher: Cengage Learning US
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Textbook Question
Chapter 7.2, Problem 12RQ
Wheel A: 32A60H8V Wheel B: 39C100L6V
Which wheel is harder?
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Problem
A2 long steel tube has a rectangular cross-section with outer dimensions of 20 x 20 mm and a uniform wall
thickness of 2. The tube is twisted along its length with torque, T. The tube material is 1045 CD steel with
shear yield strength of S,, =315 MPa. Assume shear modulus, G = 79.3GPa.
(a) Estimate the maximum torque that can be applied without yielding
(b) Estimate the torque required to produce 5 degrees total angle of twist over the length of the tube.
(c) What is the maximum torque that can be applied without yielding, if a solid rectangular shaft with dimensions
of 20 x 20 is used? You may use the exact solution.
A simply supported beam is loaded as shown. Considering
symmetry, the reactions at supports A and B are
R₁
=
R₂
=
wa
2
Using the singularity method, determine the shear force
V along the length of the beam as a function of
distance x from the support A.
A
B
Ir.
2a
За
W
C
R₁₂
x
2. Using the singularity method, determine the bending M along the length of the beam as a function of
distance x, from the support A.
3. Using the singularity method, determine the beam slope and deflection along the length of the beam
as a function of the distance x, from the support A. Assume the material modulus of elasticity, E and
the moment of inertia of the beam cross-section, I are given.
A steel tube, 2 m long, has a rectangular cross-section with outer dimensions of 20 × 30 mm and a uniform wall
thickness of 1 mm. The tube is twisted along its length with torque, T. The tube material is 1018 CD steel with shear
yield strength of Ssy =185 MPa. Assume shear modulus, G = 79.3GPa.
(a) Estimate the maximum torque that can be applied without yielding.-
(b) Estimate the torque required to produce 3 degrees total angle of twist over the length of the tube.
(c) What is the maximum torque that can be applied without yielding, if a solid rectangular shaft with dimensions
of 20 x 30 mm is used? You may use the exact solution:
Chapter 7 Solutions
Student Workbook and Project Manual for Hoffman/Hopewell's Precision Machining Technology
Ch. 7.1 - What are three benefits of precision grinding?Ch. 7.1 - What is the major use of the surface grinder?Ch. 7.1 - What are the two spindle types used for surface...Ch. 7.1 - What are the two types of table movements used for...Ch. 7.1 - Label the parts of the surface grinder.Ch. 7.1 - What are three types of cylindrical grinders?Ch. 7.1 - Tool and cutter grinders can be used to _______...Ch. 7.2 - What wheel shapes are commonly used for surface...Ch. 7.2 - What abrasive is commonly used to grind steels?Ch. 7.2 - What abrasive is used to grind nonferrous metals,...
Ch. 7.2 - What does CBN stand for?Ch. 7.2 - What superabrasive is a good choice for grinding...Ch. 7.2 - The grade of a wheel describes its __________ on a...Ch. 7.2 - Prob. 7RQCh. 7.2 - Prob. 8RQCh. 7.2 - Generally, harder wheels should be used to grind...Ch. 7.2 - Wheel A: 32A60H8V Wheel B: 39C100L6V What is the...Ch. 7.2 - Wheel A: 32A60H8V Wheel B: 39C100L6V Which wheel...Ch. 7.2 - Wheel A: 32A60H8V Wheel B: 39C100L6V Which wheel...Ch. 7.2 - Wheel A: 32A60H8V Wheel B: 39C100L6V Which wheel...Ch. 7.2 - Wheel A: 32A60H8V Wheel B: 39C100L6V What type of...Ch. 7.3 - List five surface grinder safety guidelines.Ch. 7.3 - What should be done to every grinding wheel before...Ch. 7.3 - When using a magnetic workholding device, the work...Ch. 7.3 - When using a magnetic chuck to hold a workpiece...Ch. 7.3 - Describe the difference between wheel truing and...Ch. 7.3 - What tool is used to true and dress an aluminum...Ch. 7.3 - How is a CBN wheel trued and dressed?Ch. 7.3 - Depth-of-cut range for surface grinding is: a....Ch. 7.3 - What should be done to a magnetic chuck when it...Ch. 7.3 - What workholding device can extend the magnetic...Ch. 7.3 - What workholding device can be used when grinding...Ch. 7.3 - Briefly describe the method for grinding two...Ch. 7.3 - List three types of workpiece features that can be...Ch. 7.3 - List three possible solutions to eliminate bum...Ch. 7.3 - What can cause scratches on the surface of a...
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