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Lesson
9: Techniques, Intersections and Sections
"Holes" |
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There are many techniques used in technical illustration.
In this lesson you will be practicing the methods of
drawing various types of holes in models: countersunk,
counter bore, bead up or flanged out holes. There are
various commands in Autocad for accomplishing drawing
these kinds of holes both isometrically and three dimensionally.
The ellipse is used extensively in illustrating these
various kinds of holes. In this lesson you will be drawing
various models that illustrate the aforementioned hole
styles.
Connecting Your Learning
As you work your way through this lesson, you should
reflect on the following questions:
Why are counter bores used?
What parts illustrate countersunk holes?
Does the chamfer command in autocad produce countersunk
holes ?
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The State of Arizona has assembled Drafting
standards to make sure that Instruction is thorough
and well thought out by the instructor. By clicking
on the hyperlink below will upload to your browser window
the entirety of these standards. The standards that
are addressed in this lesson are below the hyperlink.
1.0 USE BOARD DRAFTING EQUIPMENT,
INSTRUMENTS AND MEDIA.
2.0 DEMONSTRATE SKETCHING, LETTERING,
AND LINE SKILLS.
- 2.1 Demonstrate freehand sketching skills for drafting
applications.
- 2.2 Demonstrate lettering skills.
- 2.3 Demonstrate line work.
6.0 DEMONSTRATE GEOMETRIC CONSTRUCTIONS
- 6.1 Measure Geometric Constructions.
- 6.2 Develop Geometric Constructions.
8.0 APPLY BOARD DRAFTING SKILLS TO COMPUTER-AIDED
DESIGN/DRAFTING (CADD)
- 8.1 Demonstrate computer skills for a CADD system.
- 8.2 Create dimensional CADD entities.
- 8.3 Create 3 dimensional CADD drawings.
The State of Arizona has also assembled Math
standards and many of these apply directly to
the vocational subject area of Drafting. Drafting
is a very precise discipline and the use of mathematics
is integral to design and manufacturing. Below are
the math standards that are involved in this lesson
1M-P1. Compare and contrast
the real number system and its various subsystems
with
regard to their structural characteristics
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PO 2. Compare subsets of the
real number system with regard to their properties
(commutative, associative, distributive, identity,
inverse and closure properties)
1M-P2. Construct, interpret and
demonstrate meaning for real numbers and absolute
- PO 3. Solve real-world distance problems using
absolute value
- PO 4. Determine, among the solutions to a real-world
problem, which, if any, is reasonable
- PO 2. Define absolute value as the distance from
the origin
4M-P1. Interpret and draw three-dimensional
objects
- PO 1. Sketch prisms, pyramids, cones, cylinders
and spheres
- PO 2. Classify prisms, pyramids, cones, cylinders
and spheres by base shape and lateral surface shape.
- PO 3. Recognize the three-dimensional figure represented
by a two-dimensional drawing.
- PO 5. Make a model of a three-dimensional figure
from a two-dimensional drawing and make a two-dimensional
representation of a three-dimensional object (models
and representations include scale drawings, perspective
drawings, blueprints or computer simulations)
4M-P4. Deduce properties of,
and relationships between, figures from given
assumptions
- PO 1. Find similarities and differences among
geometric shapes and designs using a given attribute
(e.g., height, area, perimeter, diagonals and angle
measurements)
- PO 2. Identify arcs, chords, tangents and secants
of a circle
- PO 3. State valid conclusions using given geometric
definitions, postulates and theorems
- PO 4. Represent pi as the ratio of circumference
to diameter
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Lesson
Objectives
By the end of this lesson you should be
able to:
1. Draw a counter bore isometrically and
in 3d..
2. Use the chamfer command in CADD to create a countersunk
ho le..
3. Section a sphere.
5. Orient a 3d image to an isometric perspective.
Key
Terms
"click
on the key on any of these terms and it will hyperlink
to the course glossary" |
The following
are the models that will be used for Lesson 9:
*Note:
The Lessons are best viewed with real player and you
can download the latest version by clicking on the
words real
player.
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The following is the orthographic top view
and full sectional of the 'pulley base': Lesson 9a. This is
what your completed assignment should look like.
Lesson 9b example of half scale orthographic's
with full Isometric Sectional showing the details of the a
counter bore and countersunk holes.
Lesson 9c is an example of a 3d image slice
in half using ACAD and oriented in isometric perspective,
rendered by applying materials and setting the lights.
Your
Text Book and Reading Assignments
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Text:
Technical Illustration by Thomas
Use
Chapter 5"Basic Techniques, Intersections
and Sections''
Pages 56-80, as a reading reference.
Lesson 9 assessment comprises:
-
Lesson 9a As viewed in the lesson
9 web page.(10 pts.)
- Lesson 9b As viewed in the lesson 9 web page (10
pts.)
- Lesson 9c As viewed in the lesson 9 web page.(20
pts.)
Rubrics for Grading: The drafting
standards for assessing the quality and accuracy of your drawings
are as follows: Neatness, Accuracy and Lines and Lettering.
One half of one point (.5) will be taking off your score in
relation to NALL.
Submit by email attachment all of
the above lessons as dwg. files and send to your Instructor whose
mail address is. losimilar@yahoo.com
Your Instructor will grade your
drawings within 24 hours and email you back the grade/assessment
of your work. You should take allot of pride in your work.
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