CADD which stands for Computer Assisted Drafting and Design is a tool used by Draftsman and Illustrators to design (create a blueprint) of objects that represent utility in our world today. Utility is usefulness. All of devices today from computers to pencils and pens, to airplanes and automobiles, to advanced electronic devices and satellites, everything that we could imagine is 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 This older form of creating blueprints has been replaced by this highly accurate computer software.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 although others exist which serve the same purpose.

Learning CADD, is best accomplished by creating all the prints that are necessary to build and illustrate a particular model.

Lesson 11 involves drafting out Section 4 of the pump housing. As you can see from the previews below the hollow elongated area in the center of the housing has some function. As you might surmise if you have any mechanical background that this is the chamber where spur gears spin and move hydraulic fluid to affect a actuator/hydraulic piston and its movement. Interestingly enough a small pump is capable of a mechanical advantage much beyond the invention of he lever.

This part of the housing, is made in this particular application, of an aluminum alloy and its chambered areas house the spinning spur gears.

Piece by piece we are constructing the hydraulic pump. You will learn how to, once again rotate a 3d model into isometric position for illustration purposes.

Connecting Your Learning

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

How did this model get its name?
What is the purpose of the this part of the Hydraulic Pump?
How to shade a 3d model to resemble its true characteristics?
Why is 3d modeling so important for a Draftsman and an Illustrator?
How is rotating in views and in 3d useful to a Draftsman or a Machinist that is creating a part?
What is the function of the the center area of this section of the pump housing?

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. Create the orthographic views of the pump housing section (4).
2. Identify the isometric angles used to create isometric views by rotating in 3d.
3. Understand how to use the commands of : line, copy, move, the @ command, region, subtract, array, offset, extrude, rotate3d, fillet, revolve, vectoring and of course working as always with properties.
4. Create a 3d model of the pump housing section (4).
5. Center orthographic models in paper space using 1.5" between views.
6. Attaching a drawing file to email as an attachment.
7. Identify the working view of a model and its front, top and side views.
8. Use a 3d model to illustrate its Isometric view with and without the model itself being in 2d or 3d wire frame.

Key Terms

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

radius	rotate 3d	ellipse	orthographic
2d wire frame	3d wire frame	actuators	aligned
font	straight line rendering	index	dimension
rotate	hydraulic	oblique	PTO's

 

Instruction

Your Text Book and Reading Assignments

Summary and Assessment