Precision Machining Technology
3rd Edition
ISBN: 9781337795302
Author: Peter, Hoffman.
Publisher: Cengage Learning,
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Textbook Question
Chapter 8.6, Problem 12RQ
A G98 in a canned cycle sets the return point to the ____ _____ and a G99 sets the return point to the _____ _______.
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cutting
Instructions:
Do not copy the drawing.
Draw In third-angle orthographic projection, and to scale 1:1,
the following views of the hinge:
A sectional front view on A-A
A top view
⚫ A right view (Show all hidden detail)
Show the cutting plane in the top view
. Label the sectioned view
Note:
All views must comply with the SABS 0111 Code of Practice for
Engineering Drawing.
Galaxy A05s
Assessment criteria:
⚫ Sectional front view
026
12
042
66
[30]
11
10
1. Plot the moment (M), axial (N), and shear (S) diagrams as functions of z.
a)
b)
F₁ = 1250 N
F₁ = 600 N
M₁ = 350 000 N mm
F2 = 500 N
200 N
a = 600 mm
b=1000 mm
a=750 mm
b = 1000 mm
d)
M₁ = 350 000 N mm
F₁ = 600 N
F₂ =200 N
a = 600 mm
b = 1000 mm
M₁ 175 000 Nmm
F = 900 N
a-250 mm
b-1000 mm
-250 mm.
Figure 1: Schematics problem 1.
Given the following cross-sections (with units in mm):
b)
t=2
b=25
h=25
t = 1.5
b=20
b=25
t=2
I
t = 1.5
a=10
b=15
h-25
b=15
t=3
T
h=25
Figure 3: Cross-sections for problem 2.
1. For each of them, calculate the position of the centroid of area with respect to the given coordinate system
and report them in the table below.
2. For each of them, calculate the second moments of inertia I...
and I, around their respective centroid
of area and report them in the table below. Note: use the parallel axes theorem as much as possible to
minimize the need to solve integrals.
Centroid position
x
y
box
Moment of inertia
lyy
by
a)
b)
c)
d)
e)
Chapter 8 Solutions
Precision Machining Technology
Ch. 8.1 - What is an ATC?Ch. 8.1 - What is an MCU and what is its function?Ch. 8.1 - Briefly describe a ball screw and a linear guide.Ch. 8.1 - Explain the benefits of using the absolute...Ch. 8.1 - Explain the benefits of using the incremental...Ch. 8.1 - Which coordinate system uses an angle and a...Ch. 8.1 - What is the name for the type of motor used to...Ch. 8.1 - Supposing a programmer, using absolute mode,...Ch. 8.1 - What is a modal code?Ch. 8.1 - What is another name for the Cartesian coordinate...
Ch. 8.1 - List four G-codes and describe their functions. a....Ch. 8.1 - List four M-codes and describe their functions. a....Ch. 8.1 - What is the name of the character that ends each...Ch. 8.1 - Explain the purpose of the safe-start portion of a...Ch. 8.2 - Name the two primary machine axes on most CNC...Ch. 8.2 - Explain the difference between a turning center...Ch. 8.2 - List the three common types of live toolholders....Ch. 8.2 - Name three major collet styles used in...Ch. 8.2 - Name three types of workholding devices for...Ch. 8.2 - Name three major styles of turning machines....Ch. 8.2 - Explain why some workholding devices can be run at...Ch. 8.2 - Explain the difference between an OD grooving tool...Ch. 8.2 - When machining workpieces made from bar stock,...Ch. 8.2 - Describe how a sub-spindle can be used to increase...Ch. 8.2 - How does a Swiss turning center differ from a...Ch. 8.3 - Write the X- and Z-axis coordinates for the part...Ch. 8.3 - To perform a facing cut using a tool with a nose...Ch. 8.3 - Explain the difference between rigid tapping and...Ch. 8.3 - How must the feed rate for tapping using a...Ch. 8.3 - Describe what happens to a concave radius (fillet)...Ch. 8.3 - Describe what happens to an outside chamfer when...Ch. 8.3 - If a G1 code command is programmed partway through...Ch. 8.3 - List and briefly describe the two methods for...Ch. 8.3 - Explain in your own words the difference between...Ch. 8.3 - In your own words, describe a canned cycle.Ch. 8.3 - List two types of canned cycles besides roughing...Ch. 8.4 - What machine mode is generally used to manually...Ch. 8.4 - MDI stands for _________ ___________ ________.Ch. 8.4 - Which must be set first, the tool geometry offset...Ch. 8.4 - What is the process called where a program is sent...Ch. 8.4 - Explain the purpose of homing.Ch. 8.4 - What is the process called when a new program is...Ch. 8.4 - When setting up a machine to run a program that...Ch. 8.4 - What does MCS stand for?Ch. 8.4 - What is used to adjust the clamping pressure of...Ch. 8.4 - What does MCS stand for?Ch. 8.4 - What does WCS stand for?Ch. 8.4 - A workpiece offset is the distance from __________...Ch. 8.5 - Explain the difference between a machining center...Ch. 8.5 - Name the two major types of ATCs and briefly...Ch. 8.5 - What are the two basic types of tapping...Ch. 8.5 - What are the three most common styles of collets...Ch. 8.5 - What are the two basic types of tapping...Ch. 8.5 - Prob. 6RQCh. 8.5 - A programmable indexing fixture creates a fourth...Ch. 8.5 - A _______ ________ uses interchangeable tooling...Ch. 8.5 - Briefly describe a tombstone used for CNC...Ch. 8.5 - A custom ______ can be designed and built to hold...Ch. 8.5 - The combination of the machining operations...Ch. 8.6 - What are the three major axes used during CNC mill...Ch. 8.6 - What command would be given to turn on the spindle...Ch. 8.6 - What G-code designates IPM feed rate mode? IPR...Ch. 8.6 - What is the purpose of a clearance plane in CNC...Ch. 8.6 - What is the purpose of work coordinate systems?Ch. 8.6 - Briefly define linear interpolation.Ch. 8.6 - If during the last operation on a part, a G1 code...Ch. 8.6 - Briefly describe the use of I and J for the arc...Ch. 8.6 - Write two blocks of code that could be used to...Ch. 8.6 - Briefly explain the difference between rigid and...Ch. 8.6 - Define the initial plane for a canned drilling or...Ch. 8.6 - A G98 in a canned cycle sets the return point to...Ch. 8.6 - A _____ code is used to cancel a canned cycle.Ch. 8.6 - What two codes are used to activate automatic...Ch. 8.6 - What two codes are used to activate automatic...Ch. 8.6 - What code is used to cancel automatic cutter...Ch. 8.7 - Which must be set first, a work offset or a tool...Ch. 8.7 - What mode is used to manually enter programs into...Ch. 8.7 - What is the process called when a program is sent...Ch. 8.7 - Explain what may occur that makes it necessary to...Ch. 8.7 - Explain the purpose of homing.Ch. 8.7 - What is the process called when a new program is...Ch. 8.7 - What are two actions that can be taken during the...Ch. 8.7 - When automatic cutter radius compensation is used...Ch. 8.7 - Which machine mode allows short, temporary program...Ch. 8.7 - Which machine mode is used to run the machine...Ch. 8.7 - What are the two controls on the machine's control...Ch. 8.7 - What control panel feature can be used to slow a...Ch. 8.8 - Prob. 1RQCh. 8.8 - Prob. 2RQCh. 8.8 - What are the three primary steps in creating a CNC...Ch. 8.8 - Prob. 4RQCh. 8.8 - What is the definition of entity?Ch. 8.8 - Why should a toolpath be verified on the screen of...Ch. 8.8 - What is a post-processor used for?Ch. 8.8 - What is it called when mutiple touching entities...Ch. 8.8 - What type of cutting tool is usually used for...
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