lecture 04a - design isometrics and intro to autocad

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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

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FEH Homepage

Labs

Labs

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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

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30o 30o

60o60o

Isometric Axis

Making an Isometric Sketch- Defining The Axis

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DepthWidth

Height

Isometric Axis Convention

Making an Isometric Sketch- Axis Convention

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Object for Practice

How would you sketch this object?

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Front Face

Height

Width

Blocking in the Object– Begin with Front Face

Start with Isometric

Axis

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Height

Depth

Side Face

Blocking in the Object– Add Side Face

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Top FaceBlocking 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

Length

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Step 2 – Ellipse on Front Face

Lines to Tangent Points

- lines to tangent points

- corner to corner to get center

Tangent Points

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Step 3 – Ellipse on Front Face

Tangent Points

Sketch in Arcs

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Step 4 – Ellipse on Back Face and Profile

Draw Tangent Lines for ProfileComplete Visible Part of Back Ellipse

Repeat for ellipse on rear face

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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

Visible LineCenter Line

Hidden 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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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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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 2002This is the opening screen for AutoCAD 2002

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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

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Today’s Drawing

This is This is object object that that

will be will be drawn drawn todaytoday

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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 1Drawing Drawing

is is CompletComplet

ee

Layout1Layout1

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TB – Step 2

Select OKSelect OK

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TB – Step 3TITLEBLOCKTITLEBLOCK

Select OKSelect OKExplode - YesExplode - Yes

INSERT INSERT CommandCommand

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TB – Step 4

Enter TitleEnter Title

EDIT CommandEDIT Command

Click on TextClick on Text

* Repeat for each * Repeat for each Field *Field *

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TB - Complete

CompletCompleted ed

DrawingDrawing

Print Print PreviePrevie

ww

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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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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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