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Lesson
2: Drawing the Guide in Ortho, Iso and 3d |
FIG.2a (the
guide)
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In this lesson you will drawing the orthographic views
of the Guide.
As you can imagine by its name, the guide, guides
other objects in machinery. Guides are found in power
equipment and table saws to name but a few devices
we might find this device.
Although not any more complicated than the holder
it has a hidden line on its top view..
Hidden lines are important to understand as a Draftsman
because they demonstrate a unseen attribute of an
object in one of its useful views.
Connecting Your Learning
As you work your way through this lesson, you should
reflect on the following questions:
Where you might find a guide in your everyday life?
When are hidden lines used in Drafting ?
What view is the best to create regions and then extrude
a 3d model?
The necessity of creating a "Glass Box"?
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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 the orthographic views of the
guide.
2. Identify the isometric angles used to create isometric
views (30, 90 and 150 degrees)
3. Draw the Isometric view of the guide within a "glass
box".
4. Scale the orthographic's to use as a reference in
layout-c to draw the isometric view.
5. Identify the working view of a model.
6. Create the 3d model of the guide from extruding parts
of the orthographic views.
7. Submit your assignment as an attachment in email.
Key
Terms
"click
on the key on any of these terms and it will hyperlink
to the course glossary" |
The 2nd model
you will be drawing is called the guide because its function
is to guide another object. Guides are found in automobile
engines and in many other kinds of equipment. This part
could be made from materials including metals, ceramics,
plastics and wood.
Insert your
Lesson 2a media disk into your CD drive and begin listening
to the avi file: lesson 2a. You can open up both software
programs: ACAD and your media player at the same time
and toggle back and forth between screens, and be able
to draw and listen simultaneously.
Beow is an
example of what your completed drawing should look like.
Pay attention to details so you can obtain all your points
for this assignment. It is always better to get it right
the first time, especially when you have what the finished
product should look like. I will mention in the media
files about the Dim-scale of the dimension text.
The next part of Lesson 2b is creating the
Isometric view of these flat 2 dimensional images of the
guide. This is where our talent begins to develop in conceptualizing
what this model really looks like. In this lesson you will
be scaling your orthographic views and adjusting the linear
dimscale accordingly. When scaling a model with dimensions
to half of its original size requires an adjustment in the
linear and the dimscale of those dimensions.The linear scale
needs to doubled and the dimscale needs to reduced by half
its original value. I will explain this in the lesson disk
titled Lesson 2b. The following is what your completed assignment
should look like when completed.
Please Insert the Media Disk labeled Lesson
2c into your CD drive of your computer and begin listening
how to draw the 3d model of the Guide. The lesson avi is
titled Lesson 2c and below is an example of a completed
accurate model of the holder. You will submit your drawing
in North West Isometric. This is what that Isometric view
and model looks like.
*Note:
The Lessons are best viewed with real player, or Windows
Media Player 9 for 2000
Professional and Version 10 for XP.
After
completing each lesson attach your drawing to an email and
send to your Instructor's.
Your Text Book and Reading Assignments
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Text:
Autocad Drafting by
Grout, Resetarits and James
Use
this text as a reference to the media disks that you
are using for the Semester.
Lesson 2 assessment comprises:
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Lesson 2a submitted as a dwg. file
(10 pts.)
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Lesson 2b submitted as a dwg. file.(10
pts.)
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Lesson 2c submitted as a dwg. file.(10
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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