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Lesson
1: Drawing the Holder in Ortho, Iso and 3d |
FIG.1a
(the Holder)
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CADD stands for Computer Assisted Drafting and Design
and is a tool used by Draftsman and Illustrators to
design (create a blueprint) parts that represent utility
in our world today.
Utility is usefulness. All of the devices and their
parts today from computers to pencils and pens, to
airplanes and automobiles, to advanced electronic
devices and satellites are drawn by a software program.
Board Drafting is hardly ever used. This older form
of creating blueprints has been replaced by this highly
accurate computer software. ACAD, which is an Autodesk
Product is an Industry Standard for Computer Aided
Drafting.This is the software that you will use throughout
this course.
Learning CADD, is best accomplished by creating all
the prints that are necessary to build and illustrate
a particular part or model.
The Models that are chosen for this first Semester
CADD 3661 get progressively more complex as the Semester
progresses.
As the complexity of the models increases so will
your skills in CADD.Eventually you will be drawing
on your own without any assistance from instructional
media.
All of the models in this course will be drawn in
layout_c, which is the landscape view of an "A"
layout (8.5"x10.5").
The Holder in Figure.1a is named
because it holds something. A part is often named
by it function. Every model has a "Working Position".
This is the position that the part is mounted in.
The other views of the model come from this orientation.
The names of these views are: the Front, Top and
Side Views. These views are called multi views and
represent the minimum views to describe a part. Some
parts require more than 3 views while others only
require 2 views. You will learn more about useful
views in Drafting as you progress through this course.
Connecting Your Learning
As you work your way through this lesson, you should
reflect on the following questions:
Why a layout is used in creating drawings?
What are the useful views of a part?
What are multi views? What is the working
Veiw?
How is the Cartesian coordinate system used in CADD
Drafting ?
What an isometric model is and its symmetry?
Why is 3d modeling so important for a Draftsman and
an Illustrator?
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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 Layout_c using ACAD 2002.
2. Identify the isometric angles used to create isometric
views (30, 90 and 150 degrees)
3. Understand how to use the commands of : line, copy,
move, @ command and vectoring.
4. Draw an Isometric view from orthographic views.
5. Center orthographic models in paper space using 1.5"
between views.
6. Attaching drawing files to email.
7. Identify the working view of a model and its front,
top and side orthographic views.
8. Be able to orbit and adjust the drawing views to
various isometric perspectives.
9. Understand the 'minimum views rule' used in Drafting
in relation to the holder and its necessary, front,
top and side multi views.
Key
Terms
"click
on the key on any of these terms and it will hyperlink
to the course glossary" |
The
first model you will be drawing is called the holder because
its function is to hold another object. One would find many
holding devices on machinery and equipment. This part could
be made out of allot of different materials including metals,
ceramics, plastics and wood.
Before starting on the orthographic's
of this model we have to draw a layout. The name of this
layout is called "layout-c", and we will be
using this layout throughout the course.
Layout's are useful because they
have text box areas to enter attributes about the part
that is being blue printed. The Layout itself provides
a stage area in paper space where models can be centered
and arranged 1.5" between views.
Below are
the dimensions for layout c.
Please Insert the Media Disk labeled Lesson
1 into your CD drive of your computer and begin listening
how to draw layout_c and the orthographic views of the Holder.
Below is what your completed assignment for lesson
1a should look like. Please not all of the details
and that the models are centered in paper space and the
scale and date are filled in.
Please Insert the Media Disk labeled Lesson
1b into your CD drive of your computer and begin listening
how to scale the orthographic views of the holder and move
them This particular avi file will be titled lesson 1b.
We will then begin drawing the Isometric view of the holder.
Below is what your completed assignment, should look like
for lesson 1b. Please notice all the details
about the half scale orthographic views.
Please Insert the Media Disk labeled Lesson
1c into your CD drive of your computer and begin listening
how to draw the 3d model of the holder. The lesson avi is
titled Lesson 1c and below is an example of a completed
accurate model of the holder. The view that you will be
submitting this drawing is Southwest Isometric.
*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 together with the media disks
that are available for this Course.
Lesson
1 assessment comprises:
Lesson 1a submitted as a dwg file (10
pts.)
Lesson 1b submitted as a dwg file.(10
pts.)
Lesson 1c 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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