Engineering H191 - Drafting / CAD
Gateway Engineering Education Coalition Lect 4 P. 1Autumn Quarter
Design Review, Isometric Drawings and Introduction to AutoCAD
Lecture 4
Engineering H191 - Drafting / CAD
Gateway Engineering Education Coalition Lect 4 P. 2Autumn Quarter
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!)
Engineering H191 - Drafting / CAD
Gateway Engineering Education Coalition Lect 4 P. 3Autumn Quarter
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.)
Engineering H191 - Drafting / CAD
Gateway Engineering Education Coalition Lect 4 P. 4Autumn Quarter
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
Engineering H191 - Drafting / CAD
Gateway Engineering Education Coalition Lect 4 P. 5Autumn Quarter
FEH Homepage
Labs
Labs
Engineering H191 - Drafting / CAD
Gateway Engineering Education Coalition Lect 4 P. 6Autumn Quarter
Engineering Design Process
• AS DEFINED BY BERTOLINE ET. AL.
• IDEATION• REFINEMENT• IMPLEMENTATION
• You will do it all in Lab this week
Engineering H191 - Drafting / CAD
Gateway Engineering Education Coalition Lect 4 P. 7Autumn Quarter
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
Engineering H191 - Drafting / CAD
Gateway Engineering Education Coalition Lect 4 P. 8Autumn Quarter
Isometric Sketching – Example & Ellipses
Goals• A process for creating isometric drawings• A process for sketching ellipses for isometric
drawings
Reference• BTG Chapter 5
Engineering H191 - Drafting / CAD
Gateway Engineering Education Coalition Lect 4 P. 9Autumn Quarter
30o 30o
60o60o
Isometric Axis
Making an Isometric Sketch- Defining The Axis
Engineering H191 - Drafting / CAD
Gateway Engineering Education Coalition Lect 4 P. 10Autumn Quarter
DepthWidth
Height
Isometric Axis Convention
Making an Isometric Sketch- Axis Convention
Engineering H191 - Drafting / CAD
Gateway Engineering Education Coalition Lect 4 P. 11Autumn Quarter
Object for Practice
How would you sketch this object?
Engineering H191 - Drafting / CAD
Gateway Engineering Education Coalition Lect 4 P. 12Autumn Quarter
Front Face
Height
Width
Blocking in the Object– Begin with Front Face
Start with Isometric
Axis
Engineering H191 - Drafting / CAD
Gateway Engineering Education Coalition Lect 4 P. 13Autumn Quarter
Height
Depth
Side Face
Blocking in the Object– Add Side Face
Engineering H191 - Drafting / CAD
Gateway Engineering Education Coalition Lect 4 P. 14Autumn Quarter
Top FaceBlocking in the Object
– Add Top Face
Engineering H191 - Drafting / CAD
Gateway Engineering Education Coalition Lect 4 P. 15Autumn Quarter
Adding Detail – Cut Outs – Part 1
Engineering H191 - Drafting / CAD
Gateway Engineering Education Coalition Lect 4 P. 16Autumn Quarter
Adding Detail – Cut Outs– Part 2
Engineering H191 - Drafting / CAD
Gateway Engineering Education Coalition Lect 4 P. 17Autumn Quarter
Adding Detail – Cut Outs– Part 3
Engineering H191 - Drafting / CAD
Gateway Engineering Education Coalition Lect 4 P. 18Autumn Quarter
Darken Final Lines
Engineering H191 - Drafting / CAD
Gateway Engineering Education Coalition Lect 4 P. 19Autumn Quarter
Isometric ellipses
• In an isometric drawing, the object is viewed at an angle, which makes circles appear as ellipses.
• Holes
• Cylinders
Engineering H191 - Drafting / CAD
Gateway Engineering Education Coalition Lect 4 P. 20Autumn Quarter
Ellipses can be in any plane
Engineering H191 - Drafting / CAD
Gateway Engineering Education Coalition Lect 4 P. 21Autumn Quarter
Sketching an Isometric of a Hollow Pipe
Engineering H191 - Drafting / CAD
Gateway Engineering Education Coalition Lect 4 P. 22Autumn Quarter
Step 1 - Creating the Base Box
Diameter
Diameter
Length
Engineering H191 - Drafting / CAD
Gateway Engineering Education Coalition Lect 4 P. 23Autumn Quarter
Step 2 – Ellipse on Front Face
Lines to Tangent Points
- lines to tangent points
- corner to corner to get center
Tangent Points
Engineering H191 - Drafting / CAD
Gateway Engineering Education Coalition Lect 4 P. 24Autumn Quarter
Step 3 – Ellipse on Front Face
Tangent Points
Sketch in Arcs
Engineering H191 - Drafting / CAD
Gateway Engineering Education Coalition Lect 4 P. 25Autumn Quarter
Step 4 – Ellipse on Back Face and Profile
Draw Tangent Lines for ProfileComplete Visible Part of Back Ellipse
Repeat for ellipse on rear face
Engineering H191 - Drafting / CAD
Gateway Engineering Education Coalition Lect 4 P. 26Autumn Quarter
Step 5 – Ellipse for Hole on Front Face
Create Box for Hole
Sketch Ellipse
Engineering H191 - Drafting / CAD
Gateway Engineering Education Coalition Lect 4 P. 27Autumn Quarter
Isometric of Hollow Pipe
Engineering H191 - Drafting / CAD
Gateway Engineering Education Coalition Lect 4 P. 28Autumn Quarter
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
Engineering H191 - Drafting / CAD
Gateway Engineering Education Coalition Lect 4 P. 29Autumn Quarter
Example
Visible LineCenter Line
Hidden Line
Engineering H191 - Drafting / CAD
Gateway Engineering Education Coalition Lect 4 P. 30Autumn Quarter
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
Engineering H191 - Drafting / CAD
Gateway Engineering Education Coalition Lect 4 P. 31Autumn Quarter
Example Application of Precedence
Engineering H191 - Drafting / CAD
Gateway Engineering Education Coalition Lect 4 P. 32Autumn Quarter
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
Engineering H191 - Drafting / CAD
Gateway Engineering Education Coalition Lect 4 P. 33Autumn Quarter
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
Engineering H191 - Drafting / CAD
Gateway Engineering Education Coalition Lect 4 P. 34Autumn Quarter
AutoCAD Startup Screen
This is the opening screen for AutoCAD 2002This is the opening screen for AutoCAD 2002
Engineering H191 - Drafting / CAD
Gateway Engineering Education Coalition Lect 4 P. 35Autumn Quarter
AutoCAD Toolbars
Object Object Properties Properties
ToolbarToolbar
Standard Standard ToolbarToolbar
Pull-down Pull-down MenusMenus
Draw ToolbarDraw Toolbar
Modify ToolbarModify Toolbar
Graphics Graphics CursorCursor
Graphics Graphics WindowWindow
Command Command LineLineCursor Coordinate Cursor Coordinate
DisplayDisplay
Engineering H191 - Drafting / CAD
Gateway Engineering Education Coalition Lect 4 P. 36Autumn Quarter
Today’s Drawing
This is This is object object that that
will be will be drawn drawn todaytoday
Engineering H191 - Drafting / CAD
Gateway Engineering Education Coalition Lect 4 P. 37Autumn Quarter
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]
Engineering H191 - Drafting / CAD
Gateway Engineering Education Coalition Lect 4 P. 38Autumn Quarter
TB – Step 1Drawing Drawing
is is CompletComplet
ee
Layout1Layout1
Engineering H191 - Drafting / CAD
Gateway Engineering Education Coalition Lect 4 P. 39Autumn Quarter
TB – Step 2
Select OKSelect OK
Engineering H191 - Drafting / CAD
Gateway Engineering Education Coalition Lect 4 P. 40Autumn Quarter
TB – Step 3TITLEBLOCKTITLEBLOCK
Select OKSelect OKExplode - YesExplode - Yes
INSERT INSERT CommandCommand
Engineering H191 - Drafting / CAD
Gateway Engineering Education Coalition Lect 4 P. 41Autumn Quarter
TB – Step 4
Enter TitleEnter Title
EDIT CommandEDIT Command
Click on TextClick on Text
* Repeat for each * Repeat for each Field *Field *
Engineering H191 - Drafting / CAD
Gateway Engineering Education Coalition Lect 4 P. 42Autumn Quarter
TB - Complete
CompletCompleted ed
DrawingDrawing
Print Print PreviePrevie
ww
Engineering H191 - Drafting / CAD
Gateway Engineering Education Coalition Lect 4 P. 43Autumn Quarter
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!!
Engineering H191 - Drafting / CAD
Gateway Engineering Education Coalition Lect 4 P. 44Autumn Quarter
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