Engineering H191 - Drafting / CAD
Design Review, Isometric Drawings and
Introduction to AutoCAD
Lecture 4
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Lect 4
P. 1
Engineering H191 - Drafting / CAD
Topics For Today
• Using the Engineering Design Process
(Review - Preparation for Lab)
• More Freehand Sketching
– Isometric Sketches
• Introduction to AutoCAD 2002
– (You should have read Lesson 1 by now!)
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Engineering H191 - Drafting / CAD
Topics For Today
• Suggestions For Leisure Reading
– “All Corvettes Are Red”
– “The Soul Of A New Machine”
– “To Engineer Is Human”
• Hands-on Lab Tomorrow – HI 208
– READ TWTW, pp. 8-23
(or pp. 10-27 in 1st Ed.)
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Engineering H191 - Drafting / CAD
FEH Program Web Page
• The FEH program web page may be found at:
http:// feh.eng.ohio-state.edu
• Read lab write-up Tonight!
– Click on Labs Link on FEH Homepage
Autumn Quarter
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Lect 4
P. 4
Engineering H191 - Drafting / CAD
FEH Homepage
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Engineering H191 - Drafting / CAD
Engineering Design Process
• AS DEFINED BY BERTOLINE ET. AL.
•
•
•
IDEATION
REFINEMENT
IMPLEMENTATION
• You will do it all in Lab this week
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Engineering H191 - Drafting / CAD
Design
• What is design?
– PROCESS OF CONCEIVING OR INVENTING
IDEAS – Start w/ brainstorming for this lab
• The Art of Design
– DESIGN FOR FUNCTION AND PURPOSE
• The Practice of Engineering Design
– PRODUCT DESIGN
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Engineering H191 - Drafting / CAD
Isometric Sketching
– Example & Ellipses
Goals
• A process for creating isometric drawings
• A process for sketching ellipses for isometric
drawings
Reference
• BTG Chapter 5
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Making an Isometric Sketch
- Defining The Axis
60o
60o
30o
30o
Isometric Axis
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Making an Isometric Sketch
- Axis Convention
Height
Width
Depth
Isometric Axis Convention
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Object for Practice
How would you
sketch this object?
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Blocking in the Object
– Begin with Front Face
Front Face
Height
Start with
Isometric Axis
Width
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Blocking in the Object
– Add Side Face
Side Face
Height
Depth
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Top Face
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Blocking in the Object
– Add Top Face
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Adding Detail – Cut Outs
– Part 1
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Adding Detail – Cut Outs
– Part 2
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Adding Detail – Cut Outs
– Part 3
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Darken Final Lines
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Isometric ellipses
• In an isometric drawing, the object is viewed at an
angle, which makes circles appear as ellipses.
• Holes
• Cylinders
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Ellipses can be in any plane
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Sketching an Isometric of a Hollow Pipe
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Step 1 - Creating the Base Box
Diameter
Diameter
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Length
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Step 2 – Ellipse on Front Face
- corner to corner to get center
- lines to tangent points
Tangent Points
Lines to Tangent
Points
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Step 3 – Ellipse on Front Face
Sketch in Arcs
Tangent Points
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Step 4 – Ellipse on Back Face
and Profile
Repeat for ellipse on rear face
Draw Tangent Lines for Profile
Complete Visible Part of Back
Ellipse
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Step 5 – Ellipse for Hole on
Front Face
Create Box for Hole
Sketch Ellipse
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Isometric of Hollow Pipe
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Defining Hidden and Center Lines
• Hidden Line – used to represent features that
cannot be seen in the current view
• Centerlines – used to represent symmetry and to
mark the center of circles and the axes of
cylinders, and the axes of symmetrical parts,
such as cylinders and bolts
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Example
Center Line
Hidden Line
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Visible Line
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Precedence of Lines
VISIBLE LINE takes precedence
over all other lines
HIDDEN LINE and CUTTING PLANE
LINE take precedence over center
lines
CENTER LINE does not have
precedence
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Engineering H191 - Drafting / CAD
Example Application of Precedence
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Engineering Drawings
•
•
Drawing
Borderline and Title Block
– Borderline – Space outside left blank so details
are not lost if the edge of the drawing is torn
– Title Block – Information about who did the
drawing, when it was done, where it was saved
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Engineering H191 - Drafting / CAD
AutoCAD 2002
• A 2D drawing and 3D modeling package
• Will learn to use the software through a variety of
guided exercises and homework assignments
• Today's Lesson
– Geometric Construction Basics
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AutoCAD Startup Screen
This is the opening screen for AutoCAD 2002
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Pull-down Menus
Engineering H191 - Drafting / CAD
Draw Toolbar
AutoCAD Toolbars
Modify Toolbar
Standard Toolbar
Object Properties
Toolbar
Graphics Cursor
Graphics Window
Command Line
Cursor Coordinate Display
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Today’s Drawing
This is
object
that will
be
drawn
today
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AutoCAD Title Block
• For each drawing that you turn in, you will need to insert a
title block
• STEPS
– Complete the drawing
– Go to Layout 1
• Click OK when the window pops up
– Use the Insert Command [INSERT]
• Select the file “TITLE BLOCK”
• Select Explode the Title Block (so you can edit)
– Use the Edit Command to change the text [ED]
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TB – Step 1
Drawing
is
Complete
Layout1
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TB – Step 2
Select OK
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TB – Step 3
TITLEBLOCK
Explode - Yes
Select OK
INSERT Command
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TB – Step 4
* Repeat for each Field *
Click on Text
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Enter Title
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EDIT Gateway
Command
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TB - Complete
Print
Preview
Completed
Drawing
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AutoCAD 2002 – Lesson 2
• Work through the lesson at your own pace
• Ask questions as they come up
• Once the Guide Plate is drawn and has a Title
Block, print it and turn it in.
• Draw Exercise 2 – this will be Drawing 7
• Think about what you are doing while you follow
the steps.
• Goal - be able to draw without the book!!
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Engineering H191 - Drafting / CAD
Assignments
• Dwg 7 – Lesson 2, Exercise 2 (page 2-23)
– Save as MOUNT BLOCK
– Due at end of class today
• Dwg 8 – G15
– Sketch a pictorial view of each object
– Due at the beginning of the next lecture
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