engineering 22 introduce to autocad

• Functions for controlling views • Modifiers for changing drawing geometry • Annotation commands for adding text, dimensions, and notes  The use of CAD has Revolutionized Engineering

What are the “C”, “A”, and “D”?

 CAD Stands for One of

• Computer Aided Design

– The More Typical Definition

• Computer Aided Drafting

 Sometimes See CADD or CAE

• Computer Aided Drafting & Design

– Covers Both Bases

• Computer Aided Engineering

– Typically CADD + Numerical-Analysis

Elements of a CAD System

 Computer; e.g., DeskTop PC

 Input Devices; e.g., mouse, KeyBd

 OutPut Devices; e.g., Plotter, Printer

 Operating Software; e.g WindowsXP, Mac OSX, Unix, Linux

 CAD/CAE Application Software

• e.g., AutoCAD, TurboCAD, ProE,

SolidWorks, many others

CAD Software

 Common Basic Elements

• Commands to generate geometry

– Makes Mathematically Accurate Lines, Curves, Surfaces, Volumes, etc.

• Functions for controlling views

• Modifiers for changing drawing geometry

• Annotation commands for adding text,

dimensions, and notes

 The use of CAD has Revolutionized

Engineering Graphics

Rm 1618 CAD Lab cont

 The “OnDuty” CADLab Supervisor Can Assist with OPERATION of the Lab,

Computers or AutoCAD

• e.g., He/She can show you how toTurn on AutoCAD, print, etc.

• He/She May NOT be able to help with

questions related to Course CONTENT

 BMayer on OnDuty per Syllabus

• CAN Assist with Course Content

AutoCAD WorkSpace

Status Line CoOrd Display

Command Line

Cursor

Object Properties TB Standard TB

PullDown Menus Drawing TB

Layer TB

Modify TB

Drawing Area

AutoCAD ToolBars: Move/Size

 ACAD ToolBars Can Moved and Sized using the Same Techniques as with other MSWindows Applications

ReSize CommandLine Box

Resize Using Double-Bar Cursor

Recommend Minimum 2-Lines High

Allowing the Cursor to

“Linger over a Tool Brings up a Descriptive

“ToolTip”

Start a NEW Drawing

 Start a New Drawing

Select Template Dialog-Box

• Appears After the New File

Command(s)

• A Template is a Standard format

• For Now Suggest Using the

acad.dwt Template

• Click Open to Start the New Drawing

Name & Save Drawing

 Naming AutoCAD Files

• NOT Case Sensitive

• Any Combination of Letters and Numbers

– Also Allowed = $, -, _

• Not Allowed = \, /, %, *

AutoCAD Drawing Units

 “ACAD” Has Five

Unit-Systems

• Each has Five

Formatting

Parameters

 To Adjust the Unit

System Use the

PullDown Menu

• Format → Units

Format Units

 The Drawing Units

Dialog Box

 In ENGR22 We will Typically Use for

Length Units

• Type → Decimal

• Insertion Scale → one of

– Inches (in or “) – Millimeters (mm)

• Precision

– in → 0.00 or 0.000 – mm → 0 or 0.00

Format Units cont

Standard Paper Sheet Sizes

 USA Standards (in)

• The “Limits” Usually

Set to Match the

2 Use the PullDown

Menu: Format →

Drawing Limits

Drawing Limits cont

– Brings up notation in Command Line

3 Accept the

Lower-Left at <0.0000, 0.000> by hitting

Enter

– Brings the Next Query into the Command Line

4 Enter 11, 8.5 and

hit Enter to set the

Upper Right Limit

Grid & Snap

 Grid is just a visual

aid for your drawing

 Snap allows you to

specify precise

coordinates when

using the mouse

 They are modified

with the GRID and

 Function keys set GRID and SNAP

 “modes”: on and off

 F7 - Sets GRID mode on/off

 F9 - Sets SNAP mode on/off

Grid & Snap

 acadiso.dwt

• Limits (420,297)

 Grid set to 10 mm

 Snap set to 20mm

1st Drawing cont

• Pick the GREEN Box

and then click OK

Type “Object”

Click

“Color → white”

of the screen

5 Hit the Save tool

1st Drawing cont

Drawing

ToolBar

Save Again

1st Drawing cont

7 Use the Pull Down Menu:

Draw → Text → Multiline

Test

8 Drag the mouse to

• form an “MTEXT” Box

• Activates the

“Text Formatting” Box

8 In the Format Box Change

the Text Size to 15-25

• Or Whatever fits your dwg

1st Drawing cont

MTEXT Box

Change to 25

1st Drawing cont

10 Click in Inside the MTEXT

Box and Type Your HW-ID

1st Drawing cont

13 In the Command Line type zoom,

then Hit Enter

14 At the Query Prompt the letter “e”

(for “extents”) Then Hit Enter

 Your Drawing will Zoom in to Fill the Screen

1st Drawing cont

zoom → extents

17 Pick up your Copy

and you’re done

All Done for Today

See Me in

rm 1618 Lab

For Plotting

Tutorial

ISO 216 Paper Size System

In the ISO paper size system, the height-to-width ratio of all pages is the square root of two (1.4142 : 1) This aspect ratio is especially convenient for a paper size If you put two such pages next to each other, or equivalently cut one parallel to its shorter side into two equal pieces, then the resulting page will have again the same width/height ratio

The ISO paper sizes are based on the metric system The square-root-of-two ratio does not permit both the height and width of the pages to be nicely rounded metric lengths Therefore, the area of the pages has been defined to have round metric values.

• The height divided by the width of all formats is the square root of two (1.4142)

• Format A0 has an area of one square meter.

Comments Viewing AR’s

 Humans have Much Greater Lateral Peripheral Vision than Vertical

• Suggests that “Wide Screens” Are Better

 Some Viewing Aspect Ratios