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Lesson
9: Drawing the Step Flange in Ortho, Iso and 3d |
FIG. 9a
(the Step Flange)
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In lesson 9 you will be drawing the step flange.
This part is found in machinery where there are bearings
and shafts and where seals are used to keep oil and
grease in and dirt and water out. The steps of the
flange often are used to locate not only a seal but
a gear or sprocket.
This is a fairly simple model to draw in ortho, iso
and in 3d. There are certain strategies working in
the Z axis for locating areas to extrude, move and
subtract. You will be challenged by these strategies.
Also in the orthographic view we are using a sectional
view to illustrate the side view, which is also the
front view with circular models.
Its benefit is a clear understanding of what the
part looks like internally. In this lesson we will
be introducing hatch marks that are used to illustrate
the cut away area of a sectional; as if the model
had been cut in half.
Connecting Your Learning
As you work your way through this lesson, you should
reflect on the following questions:
How did the step flange 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 step flange 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
Step Flange 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 Step Flange from the top
orthographic view.
6. Working with colors for visualization enhancement.
7. Maintain approximate proportions using "boxing
in" also called the "Glass box Technique"
8. Create and locate the accurate use of center lines
in orthographic drawings.
9. Create a region and use the hatch command to create
the machine marks of a saw therefore illustrating a
sectional view.
Key
Terms
"click
on the key on any of these terms and it will hyperlink
to the course glossary" |
The 9th model
you will be drawing is called the Step Flange and it is
a model where only the front and top view are necessary
to completely illustrate the model. necessary to illustrate
its attributes.
The illustration of the Switch bracket isometrically involves
one circle, but it has several non isometric lines and this
requires creating regions from certain parts of the orthographic
models.
Insert your
Lesson 8 media disk into your CD drive and begin listening
to the avi file: lesson 9a. 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.
The next part of Lesson 9b you will be creating the Isometric
view of the Step Flange.This is a challenging object to
do Isometrically, because you need to create a series
of construction lines on the Z-axis to locate the steps
by the use of ellipses.
The following is what your completed assignment should
look like when completed.You will also illustrate the
half scale orthographic/sectional view within this illustration.Notice
the straight line rendering used to illustrate the hole
of this part.
Please Insert the Media Disk labeled Lesson
9 into your CD drive of your computer and begin listening
how to draw the 3d model of the Step Flange. The lesson
avi is titled Lesson 9c and below is an example of a completed
accurate model of the Step Flange. 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 9 assessment comprises:
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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