In this first lesson we will be using the Paint Program in Windows to sketch the missing orthographic view of several models.With the use of an isometric grid you will be provided this will be accomplished.

Many models and parts that are eventually created come from an artists sketch and we will practice this process in this lesson. Also a Draftsman must be able to visualize what views are represented orthographically with a particular model. With orthographic understanding, a isometric and 3d model can be generated. Also for the purposes of dimensioning ,aligned and unidirectional dimensions will be used to understand these dimensioning standards.

Connecting Your Learning

As you work your way through this lesson, you should reflect on the following questions:

Why is an isometric grid used?
How the Cartesian coordinate system is used in Drafting ?
What an isometric model is and its symmetry?
How easy it is to sketch using this constructed grid ?

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.

• 1.1 Analyze Drawing surfaces for Drafting
• 1.6 Demonstrate Sheet Setup skills

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.

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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

• 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
  

Lesson Objectives

1. Download a jpeg from this Web site and save it to your desktop
2. Identify the isometric angles used to create isometric views (30, 90 and 150 degrees)
3. Freehand a drawing with Aligned and Unidirectional Dimension Styles.
4. Identify and draw the useful orthographic views of a model.
5. Sketch an image using a Paint Program.
6. Attaching an image file to email as an attachment.

Key Terms

"click on the key on any of these terms and it will hyperlink to the course glossary"

isometric	array	ellipse	orthographic
Illustrator	grid	unidirectional	aligned
font	line weight		dimension
layers	extension lines	dimension lines

 

Instruction

The following is the "freehand" sketching problems you will be selecting for Lesson 1a,[special key] Lesson 1b [Holder]and Lesson 1c [Connector] . You will notice that a view is missing and you will be sketching the missing view in Windows Paint shop. To obtain the sketch grid just click on this GRID and you can save this jpeg to your desktop and open it in Windows Paint Shop.The preview in your browser may be distorted but when you open this grid in Windows Paint it will be quite clear. I will explain this further in the lesson 1a media disc. Please insert the media disk and listen to lesson 1. You can also download and print out the freehand sketching problems by saving this image to the desktop or printing this image for you to view. You will see the save button on your web browser and it will generally appear in the upper left hand corner of the assignment sheet.

*Note: The Lessons are best viewed with real player and you can download the latest version by clicking on the words real player.

Your Text Book and Reading Assignments

Summary and Assessment