MME 1102 Section 2MME 1102 Section 2

Please download and SAVE file from:Please download and SAVE file from:http://10.101.129.230:8080/handout/mkarim/cad-week2.ppt

Kulliyyah of EngineeringInternational Islamic University

MME 1102MME 1102COMPUTER AIDED DRAFTINGCOMPUTER AIDED DRAFTING

Section 2Section 2

Dr. Ahsan Ali KhanDr. Ahsan Ali Khanaakhan@iiu.edu.myaakhan@iiu.edu.my

Ext.4473Ext.4473

Lecturer Room, Level 2, E0 Building Lecturer Room, Level 2, E0 Building

RULES AND REGULATIONSRULES AND REGULATIONS

• NO internet allowed during class hour and hence no downloading.

• Attendance must include PC no. If you move or change places please indicate in the attendance sheet.

• NO copying of other student’s assignment.

• NO late submission. Assignment submission

system will be disabled after class hour.

METHOD OF EVALUATIONMETHOD OF EVALUATIONSemester 1, 2007/2008Semester 1, 2007/2008

• Quiz 1 : 15%

• Quiz 2 : 20%

• Quiz 3 : 25%

• Project : 10%

• Class Assignment : 15%

• Home Assignment : 5%

• Selective Class Assignment : 10%

SLIDE DOWNLOADSLIDE DOWNLOAD

• Lecture notes for this section are available on website - (select option SAVE):

For week 1http://10.101.129.230:8080/handout/mkarim/cad-week1.ppt

For week 2, it should behttp://10.101.129.230:8080/handout/mkarim/cad-week2.pptand for week 9http://10.101.129.230:8080/handout/mkarim/cad-week9.ppt

• Student are required to enter:1. Matric no.2. Name : First name

3. Assign no. : select the appropriate one

4. File : filename should follow the following:

Class assignment : c#w#-matric# Home assignment:

h#w#-matric#

ASSIGNMENT SUBMISSIONASSIGNMENT SUBMISSION

http://10.101.129.230:8080/cad.php

For ex. Student’s Matric No: 0123456 week 1 class assignment no. 1 = c1w1-0123456 week 4 home assignment no. 1= h1w4-0123456 week 5 class assignment no. 2= c2w5-0123456

• When submitting assignment online, student must use their own computer.

• At the end of every class, student must submit the given class assignment. For submission. additional 5 minutes will be given after normal class time after which the system will be disabled.

• Home Assignment will have to be submitted on the following class. You can submit anytime on class day.

Late submission will not be entertained.Please record your sending code for future reference

Week 1Week 1

(a)(a) Introduction to CADIntroduction to CAD(b)(b) Starting up Sketcher WorkbenchStarting up Sketcher Workbench(c)(c) Setting up Sketcher: Setting up Sketcher: Unit & Grid SettingUnit & Grid Setting

(d)(d) Basic Drawing Function: Basic Drawing Function: Point/Line/Circle/Arc/Rectangle/ProfilesPoint/Line/Circle/Arc/Rectangle/Profiles

Introduction to CADIntroduction to CAD

• CAD is just a system that allows user to create or modify mechanical/electrical/architectural drawings.

• CAD has been introduced even prior to 1960’s. In the early industrial development in 1960’s:– General Motors – DAC (Design Automated by Computer)– McDonnell Douglas – CADD

http://mbinfo.mbdesign.net/CAD-History.htm

• At present, there are many CAD softwares available in the market, e.g. Autocad, CATIA, Solidworks, Pro. E, Unigraphics, I-DEAS, etc.

• For this course and for this semester we are using– ALIBRE.

Where is CAD in Product Design Where is CAD in Product Design Concept?Concept?

www.mit.edu

Major benefits of CADMajor benefits of CAD

• Productivity (=Speed) increases

• Supports changeability– Do not have to redo entire drawing with each change

• Ease Communication– With other design team– With other applications (CAE/FEM/CAM)– Marketing (realistic product presentation)

• Better Visualization of Drawings

• Analysis

• Simulation and Testing of Design

A Standard CAD ProcessA Standard CAD Process

CAD File Drawing (dxf)

StartEngineering Sketch

Setting

dim

2D 3D

AnnotationsDimensions

Output

Circle, Point, Line, Arc,

Spline, Revolve, Corner, etc.

Hole, Draft, Rib, Fillet, etcPad, Shafts, Pocket etc.

Unit, Grid (snap), etc

ALIBREALIBRE

• There are 4 specified settings in Alibre. Each setting consists of a set of tools, which allows the user to perform the specific design tasks in a particular area.

• The basic setting that we are going to learn in this course are :

1. New Part= 2D and 3D

2. New Assembly

3. New Drawing

4. New Bill of Materials

Getting Started with ALIBREGetting Started with ALIBRE

• Double Click the Alibre Design icon• Ignore Pop-up tutorial icons.• 2 windows = Home and New Part (do not cancel

Home Window)

Home Window

New Part Window

Speci

fica

tion t

ree

Tools

or

funct

ions

icon

Information

ALIBREALIBREWindows LayoutWindows Layout

Model

• Model : window to display the model or part

• Specification tree : Store information how the function that has been performed to draw a model.

• Tool and Drawing Function : To draw 2D curve and 3D model.

ALIBREALIBREWindows Layout (Cont.)Windows Layout (Cont.)

Start Drawing using AlibreStart Drawing using AlibreSetting a WorkspaceSetting a Workspace..

• Setting the Measurement Unit• File Properties

• Setting Colour Sheme (option)• Tools Options Colour Scheme tab Select

Very Light Background Scheme

Drawing a SketchDrawing a Sketch

• Sketch is 2D profile / curves drawn in a sketch plane.

• By default there are 3 Sketch planes which can be selected to draw a sketch– Default sketch planes : XY, YX, ZX

All are perpendicular to each other.

Drawing a SketchDrawing a Sketch• Choose a plane from design explorer window to draw sketch ex

XY plane

• Click Activate Sketch icon to enter to Sketcher workspace :

Sketch/Drawing workspace Sketch/Drawing workspace windowwindow

Useable Operation on Sketcher workspace

Used to draw 2D curve like Line, Arc,

Circle etc.

Grid : Square patternYou can display a grid while you are in Sketch Mode. The grid

serves as a visual guide while drawing figures

Setting a GridSetting a Grid

Procedure can be seen from Help tool

Sketch workspace Sketch workspace windowwindow

Sketcher Tool

Curve drawing tools

Constraint tools

Drawing a LineDrawing a Line

• Select Line Icon.• Click Start point on

Drawing window.• Click Next point.• Click Line Icon again

to terminate the operation

Line

Modify a LineModify a Line

Select Icon

Click Select Icon to change cursor to Selection modeSelect and Click a line to modify.

Modification functions:•To delete a line press Delete on Keyboard

• To move a line click on the line and drag to another position.

•To Change a point click at a point and drag

Drawing Snap to GridDrawing Snap to Grid

• Point of selection can be located at intersection of grid

Points of lines are snapped to grid. Size of a figure will follow the grid dimension

Drawing a CircleDrawing a Circle

• Select Circle Icon• Click center point of

circle• Click radius of Circle

• See help->index, Circle for more option of drawing a circle

Type circle

Drawing a ArcDrawing a Arc

Three are 3 Methods to draw arc:

• Center, Start, End• Start, End, Radius• Tangent, Start, End

Tangent, Start, End procedure:•Select Tangent, Start, End Icon•Select (a body of ) a reference curve •Click Start point•Click end point

Start point of arc will be tangent to reference curve

Drawing a ArcDrawing a ArcPracticePractice

• Drawing elongated hole using tangent arc

Left Arc Procedure

•Draw two parallel lines•Select Tangent, Start, End Icon •Select upper line (body),•Click on the left point of lower line

Repeat to draw Right arc

Drawing Predefined ProfileDrawing Predefined Profile

• Rectangle by to point– Create rectangle parallel to

horizontal and vertical axis

• Rectangle by 3 points– Create inclined rectangle

• Regular polygon

Click to explore

the icon

Draw any number of sides of polygon

Draw a B-splineDraw a B-spline

• B-Spline or spline

Interpolation point

Draw Spline by Interpolation pointDraw Spline by Interpolation point

• Select B-Spline by Interpolation point icon

• Click a point • Continue to next point• Double click or click

B-spline icon to terminate 1st

2nd

other

End point, Terminate by double click

Practice 1-1Practice 1-1In this practice, you will draw the sketch of the model, as shown in Figure A using Line, Arc and Circle tool. The sketch is shown in Figure B. You will not dimension the sketch. The solid model and the dimensions are given only for your reference.

Figure A: Solid Model for Practice 1-1 Figure B: Sketch of Model

Practice 1-2Practice 1-2In this practice, you will draw the sketch of the model, as shown in Figure A. The sketch is shown in Figure B using Profile and Rectangle tool. You will not dimension the sketch. The solid model and the dimensions are given only for your reference.

Figure A: Solid Model for Practice 1-2 Figure B: Sketch of the Model

Class Assignment W1Class Assignment W1 Save as: c1w1.CATpart Save as: c1w1.CATpart

Draw the sketch of the model shown in Figure A. The sketch to be drawn is shown in Figure B. Complete the drawing with correct dimensions by adjusting grid spacing to 10 mm.

Figure A : Solid model for Class Assignment W1

Figure B : Sketch of the model

Submit your class assignment (filename indicate above) at

http://10.101.230.65:8080/cad.php

Home Assignment W1Home Assignment W1 Save as: h1w1.CATpartSave as: h1w1.CATpart

Complete the drawing in Figure B with correct dimensions using all the tools that you have learned previously.

Figure A : Model for Home Assignment 1

Figure B : Sketch for Home Assignment 1

To be submitted on Week 2 class at http://10.101.230.65:8080/cad.php