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Lesson
11: Drawing the Spool in Ortho, Iso and 3d |
FIG. 11a (the Spool)
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In lesson 11 you will be drawing the spool, which
after viewing the model it is easy to see its function.
Spools are used to wrap cable in a wench, and thread
in sewing machines.
Its basic construction has its application in many
areas of manufacturing.
This part is rather easy to draw both orthographically,
Isometrically and in 3d.
Only two views are necessary to describe this model
and in this particular lesson we will use the side
view not illustrated as a sectional but illustrated
with hidden lines instead of hatched regioned areas.
The History of the wheel which is essentially what
the spool represents goes back 5500 years in Mesopotamia,
considered the birthplace of civilization. The area
now is Iraq and Syria. The Garden of Eden is supposedly
was in this area.
Connecting Your Learning
As you work your way through this lesson, you should
reflect on the following questions:
How did the spool get its name?
What is an ellipse and how is it used in this model?
What is an Iso ellipse and how can it be rotated in
ACAD and used in this model?
How will the spool model be created in 3d?
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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
spool and dimension the model.
2. Identify the isometric angles used to create isometric
views (30, 90 and 150 degrees)
3. Scale down the orthographic view and create an Isometric
view.
4. Adjust the dimscale overall and linear to reflect
full scale dimensions in the ortho/iso drawing.
5. Create the 3d model of the Spool from the top orthographic
view.
6. Working with colors for visualization enhancement.
7. Using 2 views to illustrate a model.
8. Create and locate the accurate use of center lines
in orthographic drawings.
9. Be able to distinguish when a model line takes precedence
over a hidden line.
Key
Terms
"click
on the key on any of these terms and it will hyperlink
to the course glossary" |
The 11th
model you will be drawing is called the Spool and it is
a model where only the front and top view are necessary
to completely illustrate the model and its attributes.
The illustration of the spool isometrically involves 3
circles that need to be located on the Z axis. Its front
view will be illustrated with hidden and center lines
and not as a full sectional. A full sectional is a model
that is cut completely in half (check your glossary).
Insert your
Lesson 11 media disk into your CD drive and begin listening
to the avi file: lesson 11a. 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.
Below 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 11b you will be
creating the Isometric view of the spool.This is not a difficult
object to create isometrically having mastered the Iso-ellipse
command and the ability to rotate the ellipse into the correct
perpsective.You will half scale the orthographic/sectional
and move as you have done thus far with all the models.
Using the dimensions of the half scale orthographic's, whose
linear scale has been doubled to maintain full scale dimension
aspect, you will draw the isometric view. below is what
your completed assignment should look like when complete.
Please Insert the Media Disk labeled Lesson
11 into your CD drive of your computer and begin listening
how to draw the 3d model of the spool. The lesson avi is
titled Lesson 11c and below is an example of a completed
accurate model of the Spool. You will submit your drawing
in South East Isometric. This is what your completed 3d
assignment 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 email.
email:
losimilar@yahoo.com
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 11 assessment comprises:
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Lesson 11a submitted as a dwg. file
(10 pts.)
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Lesson 11b submitted as a dwg. file.(10
pts.)
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Lesson 11c 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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