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 4.3, Problem 11RQ
Calculate feed depth for an 82-degree countersink used to machine a l/2"-diameter countersink on an existing 9/32"-diameter hole.
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1.1 Consider the fireclay brick wall of Example 1.1 that is
operating under different thermal conditions. The tem-
perature distribution, at an instant in time, is T(x) = a+
bx where a 1400 K and b = -1000 K/m. Determine
the heat fluxes, q", and heat rates, q, at x = 0 and x = L.
Do steady-state conditions exist?
2.4 To determine the effect of the temperature dependence
of the thermal conductivity on the temperature dis-
tribution in a solid, consider a material for which this
dependence may be represented as
k = k₁ + aT
where k, is a positive constant and a is a coefficient that
may be positive or negative. Sketch the steady-state
temperature distribution associated with heat transfer
in a plane wall for three cases corresponding to a > 0,
a = 0, and a < 0.
1.21 A one-dimensional plane wall is exposed to convective
and radiative conditions at x = 0. The ambient and sur-
rounding temperatures are T = 20°C and Tur = 40°C,
respectively. The convection heat transfer coefficient is
h=20 W/m² K, and the absorptivity of the exposed sur-
face is α=0.78. Determine the convective and radiative
heat fluxes to the wall at x = 0 if the wall surface tem-
perature is T, = 24°C. Assume the exposed wall surface
is gray, and the surroundings are large.
Chapter 4 Solutions
Student Workbook and Project Manual for Hoffman/Hopewell's Precision Machining Technology
Ch. 4.1 - Upright drill presses are available in _______ and...Ch. 4.1 - List two general types of upright drill press...Ch. 4.1 - Explain how the size of an upright drill press is...Ch. 4.1 - Briefly describe the term sensitive drill press.Ch. 4.1 - Briefly describe a gang drill press and its...Ch. 4.1 - When would a radial-arm drill press most likely be...Ch. 4.1 - Briefly describe a micro drill press and its...Ch. 4.2 - What are the two main materials used to make...Ch. 4.2 - What two types of shanks are commonly found on...Ch. 4.2 - Name three functions of the flutes on a twist...
Ch. 4.2 - Name two types of flute styles for machine...Ch. 4.2 - Prob. 5RQCh. 4.2 - What is the major difference between counterboring...Ch. 4.2 - What must be used to secure a workpiece to an...Ch. 4.2 - What devices are used to elevate a workpiece to...Ch. 4.2 - If 50 parts measuring 1" I" 3" each needed a...Ch. 4.2 - Which would be the best workholding device for...Ch. 4.2 - Which would be the best workholding device for...Ch. 4.2 - Which would be the best workholding device for...Ch. 4.3 - List five drill press safety guidelines.Ch. 4.3 - Briefly define the term cutting speed.Ch. 4.3 - What unit of measure is used to define cutting...Ch. 4.3 - What is feed, and how is feed stated for drill...Ch. 4.3 - Briefly describe two methods for locating hole...Ch. 4.3 - What is spotting and why is it performed?Ch. 4.3 - What is pecking, or peck drilling?Ch. 4.3 - Briefly contrast the speed and feed differences...Ch. 4.3 - What drill press component can be used to control...Ch. 4.3 - Calculate feed depth for a 90-degree countersink...Ch. 4.3 - Calculate feed depth for an 82-degree countersink...Ch. 4.3 - What benefit does tapping on the drill press offer...Ch. 4.3 - How many turns must a 1/4-20 tap be turned into a...Ch. 4.3 - Prob. 14RQ
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