1. Role of an engıneerIng drawIng
Lecture #1
Role of an engıneerIng drawIng
RES 112E – COMPUTER AIDED TECHNICAL DRAWING
ITU

2. What is Engineering Design?
Bertoline et al.
“Design is the process of conceiving or inventing ideas and communicating those ideas to others in a form that is understood easily.”
Eide
“Engineering design is a systematic process by which solutions to the needs of humankind are obtained.
Lockhart et al.
“Design is the act of creating the specifications for a product or process that best satisfies the design criteria.
RES 112E – COMPUTER AIDED TECHNICAL DRAWING
ITU

3. RES 112E – COMPUTER AIDED TECHNICAL DRAWING
Simple definition
Needs
Design Process
solutions
1. Write down the problem statement.
2. Generate possible solutions.
3. Evaluate each solution against the criteria and select the best one.
4. Document the solution.
RES 112E – COMPUTER AIDED TECHNICAL DRAWING
ITU

4. RES 112E – COMPUTER AIDED TECHNICAL DRAWING
The role of graphics
Visualization
Communication
Documentation
RES 112E – COMPUTER AIDED TECHNICAL DRAWING
ITU

5. What is engineering graphics
visual means to develop ideas and convey designs in a technical format.
the dominant means to communication
among engineers in industry.
Engineering graphics and the skills associated
are developed early in an engineer’s education.
RES 112E – COMPUTER AIDED TECHNICAL DRAWING
ITU

6. What is engineering graphics
Covered Topics
Sketching
Geometric Modeling
Engineering Drawing /Documentation
Assembly Drawing
Visualization
Rapid Prototyping
RES 112E – COMPUTER AIDED TECHNICAL DRAWING
ITU

7. Evolution of engineering drawing
Time
Ideation
Brain
Sketch
an idea
Pencil & Paper
Traditional tool
2-D CADD
Solid modeling
Create
drawings
Working Drawing
Create machine code
by operator
Translate
part information
to machine code
Interpret
by operator
Manu-
facturing
Conventional machine
(manual operate)
CNC machine
Parts
Process

8. RES 112E – COMPUTER AIDED TECHNICAL DRAWING
Computers & softwares
RES 112E – COMPUTER AIDED TECHNICAL DRAWING
ITU

9. Father of computers
He was an English mathematician, philosopher, inventor and mechanical engineer, who is best remembered now for originating the concept of a programmable computer.
Charles Babbage
(1791 –1871)
Babbage is credited with inventing the first mechanical computer that eventually led to more complex designs. His varied work in other fields has led him to be described as "pre-eminent" among the many polymaths of his century
Babbage's uncompleted mechanisms are on display in the London Science Museum.

10. RES 112E – COMPUTER AIDED TECHNICAL DRAWING
ITU

11. Historical background of computing
model number 5150
IBM PC
introduced on August 12, 1981.
The price was $1,565
ran on the Intel 8088 microprocessor
equipped with 16 kilobytes of memory
160k floppy disk
a monochrome display
a small speaker
DOS operating system
Microsoft BASIC
RES 112E – COMPUTER AIDED TECHNICAL DRAWING
ITU

12. Historical background of computing
Commodore International first released the Commodore 64 in 1982.
This machine would be Commodores last 8-Bit computer (64 KB RAM); after this they would produce only 16/32 Bit Amiga's and IBM PC clones.
RES 112E – COMPUTER AIDED TECHNICAL DRAWING
ITU

13. Historical background of computing
The Amiga is a family of personal computers sold by Commodore in the 1980s and 1990s. The first model was launched in 1985.
RES 112E – COMPUTER AIDED TECHNICAL DRAWING
ITU

14. Historical background of computing
Amstrad CPC 464
RES 112E – COMPUTER AIDED TECHNICAL DRAWING
ITU

15. Historical background of computing
It was an early portable computer.
Release date : January 1983
priced at US $2,995 (equivalent to $7,100 in 2014)
Operating system : MS-DOS
Memory : 128 kilobytes
Storage : 10 MB hard drive
2 x floopy disk (5.25’’)
Screen : 9’’ green screen
RES 112E – COMPUTER AIDED TECHNICAL DRAWING
ITU

16. Historical background of computing
128 NVDIA graphic card
128 MB +256 MB RAM,
40 GB hard disc
RES 112E – COMPUTER AIDED TECHNICAL DRAWING
ITU

17. Historical background of computing
IBM 5150 PC
Apple II
IBM 286 PC
IBM 386 PC
IBM 486 PC
RES 112E – COMPUTER AIDED TECHNICAL DRAWING
ITU

18. Historical background of computing
Notebook
Pentium PC
Pentium 4 PC
Tablet
Ultabook
RES 112E – COMPUTER AIDED TECHNICAL DRAWING
ITU

19. RES 112E – COMPUTER AIDED TECHNICAL DRAWING
ITU

20. RES 112E – COMPUTER AIDED TECHNICAL DRAWING
ITU

21. CADD
Computer-aIded draftIng & desIgn

22. RES 112E – COMPUTER AIDED TECHNICAL DRAWING
Sketchpad
In 1963, Sketchpad in MIT
The first computer aided drawing system introduced by IBM.
computer program written by Ivan Sutherland
Lincoln TX-2
RES 112E – COMPUTER AIDED TECHNICAL DRAWING
ITU

23. RES 112E – COMPUTER AIDED TECHNICAL DRAWING
Sketchpad
the ancestor of modern computer-aided drafting
a major breakthrough in the development of computer graphics in general.
RES 112E – COMPUTER AIDED TECHNICAL DRAWING
ITU

24. RES 112E – COMPUTER AIDED TECHNICAL DRAWING
Sketchpad
computer graphics be utilized for artistic and technical purposes
a novel method of human-computer interaction.
utilize a complete graphical user interface.
used an x-y point plotter display as well as the light pen.
RES 112E – COMPUTER AIDED TECHNICAL DRAWING
ITU

25. RES 112E – COMPUTER AIDED TECHNICAL DRAWING
Sketchpad
organized its geometric data pioneered the use of "objects" and "instances" in computing and pointed forward to object oriented programming.
ran jobs in batch job mode only,
using punch cards or magnetic tape.
RES 112E – COMPUTER AIDED TECHNICAL DRAWING
ITU

26. RES 112E – COMPUTER AIDED TECHNICAL DRAWING
What is CADD
Computer-aided drafting and design (CADD)
is the computer process of making engineering
drawings and technical documents more closely
related to drafting.
Two-dimensional (2D) - drawing
Three-dimensional (3D) – solid modeling
RES 112E – COMPUTER AIDED TECHNICAL DRAWING
ITU

27. Two-dimensional (2D) CAD
Two-dimensional (2D) computer drawing is the representation of an object in the single- view format which shows two of the three object dimensions or the mutiview format where each view reveals two dimensions.
RES 112E – COMPUTER AIDED TECHNICAL DRAWING
ITU

28. RES 112E – COMPUTER AIDED TECHNICAL DRAWING
Three dimensional (3D)
Three-dimensional (3D) computer drawing is the coordinate format. Three dimensional computer aided drawing allows the production of geometric models of a component or product for spatial and visual analysis.
RES 112E – COMPUTER AIDED TECHNICAL DRAWING
ITU

29. RES 112E – COMPUTER AIDED TECHNICAL DRAWING
Advantages of CADD
1. Increased accuracy
Drafting
stage
2. Increased drawing speed
3. Easy to revise
4. Availability of drawing libraries
5. Constant drawing quality
6. Multicolor drawing
1. Built-in several analysis tools
Design
stage
2. Better presentation (Easy to visualize) Pan, rotate, animate, shade, texture
3. Save on repetition
RES 112E – COMPUTER AIDED TECHNICAL DRAWING
ITU

30. Concepts in working drawing creation
Create an orthographic
view from a solid object.
Draw a closed contour
and convert to surface.
Modify this surface to
solid object.
Solid modeling
2-D CADD
Draw a group of lines that
are connected and present
Orthographic multiview
Pictorial view
RES 112E – COMPUTER AIDED TECHNICAL DRAWING
ITU

31. RES 112E – COMPUTER AIDED TECHNICAL DRAWING
Limitation of CADD
(within scope of drawing interpretation)
Good engineering drawings must have the following
characteristics.
Parts or product information is completely given.
Information is clearly presented .
Information can be used in manufacturing of part.
Always remind yourself that “Good drawing cannot be created by using CADD software alone without understanding the drawing concepts.”
RES 112E – COMPUTER AIDED TECHNICAL DRAWING
ITU

32. RES 112E – COMPUTER AIDED TECHNICAL DRAWING
Limitation of CADD
(within scope of drawing interpretation)
To create a good engineering drawings YOU MUST
do the following tasks yourself.
Apply a proper line weight and style.
Select a necessary view.
Decide the appropriate places of dimensions.
Select an appropriate section techniques (if necessary)
RES 112E – COMPUTER AIDED TECHNICAL DRAWING
ITU

33. RES 112E – COMPUTER AIDED TECHNICAL DRAWING
Limitation of CADD
(within scope of drawing interpretation)
No CADD software can create a pictorial view from
an orthographic multiview.
Because they are frequently used technical document.
Therefore,YOU MUST prepare yourself for interpreting
(or visualizing) them when you become ENGINEER.
RES 112E – COMPUTER AIDED TECHNICAL DRAWING
ITU

34. RES 112E – COMPUTER AIDED TECHNICAL DRAWING
User interface
CAD systems may be considered as comprising a large number of functions for creating or manipulating the design model.
Traditionally, there are three ways in which this is achieved:
Command-based systems
Menu driven
Icon driven
RES 112E – COMPUTER AIDED TECHNICAL DRAWING
ITU

35. RES 112E – COMPUTER AIDED TECHNICAL DRAWING
User interface
Menu
Icon
Command-based
RES 112E – COMPUTER AIDED TECHNICAL DRAWING
ITU 

36. RES 112E – COMPUTER AIDED TECHNICAL DRAWING
CADD system selection
Among the more widely used CAD systems are AutoCAD, CATIA, SolidWorks, I-DEAS, and ProEngineer.
Most of these packages have both a 2D and 3D component or have an integrated 2D and 3D modeling system.
The newer versions of drawing software operate under a menu system which can be accessed through keyboard input or mouse manipulation.
RES 112E – COMPUTER AIDED TECHNICAL DRAWING
ITU

37. RES 112E – COMPUTER AIDED TECHNICAL DRAWING
The first version AutoCAD of by the AutoDesk company was demonstrated at the 1982.
PC­ based CAD software products .
be derived from a program called Interact,
which was written in a proprietary language (SPL)
ran on the Marinchip Systems 9900 computer
by Autodesk
RES 112E – COMPUTER AIDED TECHNICAL DRAWING
ITU

38. RES 112E – COMPUTER AIDED TECHNICAL DRAWING
ITU

39. RES 112E – COMPUTER AIDED TECHNICAL DRAWING
AutoCAD ver
AutoCAD ver
AutoCAD ver
AutoCAD ver
AutoCAD ver
AutoCAD Release
AutoCAD Release
AutoCAD Release
AutoCAD Release
AutoCAD Release
AutoCAD Release
AutoCAD
AutoCAD 2000i
AutoCAD
AutoCAD
AutoCAD
AutoCAD
AutoCAD
AutoCAD
AutoCAD
AutoCAD
AutoCAD
AutoCAD
AutoCAD
AutoCAD
RES 112E – COMPUTER AIDED TECHNICAL DRAWING
ITU

40. RES 112E – COMPUTER AIDED TECHNICAL DRAWING
AutoCAD LT is the lower cost version of AutoCAD, with reduced capabilities, first released in November 1993.
Formerly marketed as AutoCAD WS, AutoCAD 360 is an account-based mobile and web application enabling registered users to view, edit, and share AutoCAD files via mobile device and web sing a limited AutoCAD feature set.
The native file format of AutoCAD is *.dwg
RES 112E – COMPUTER AIDED TECHNICAL DRAWING
ITU

41. RES 112E – COMPUTER AIDED TECHNICAL DRAWING
AutoCAD 360 (formerly AutoCAD WS) is the official AutoCAD mobile app.
AutoCAD 360 is a free, easy-to-use mobile drawing and drafting app that extends the power of CADD beyond the desktop.
AutoCAD 360 offers viewing, editing, and sharing of CAD drawings, simplifying on-site redlining, as-built documentation, and design review and approval.
Adding an optional AutoCAD 360 plan further expands the power of the free app. bringing additional capabilities to the field.
RES 112E – COMPUTER AIDED TECHNICAL DRAWING
ITU

42. RES 112E – COMPUTER AIDED TECHNICAL DRAWING
Docked toolbars
Menu bars
Modify commands
Draw commands
coordinates
Graphic window
Command line
Status bar
RES 112E – COMPUTER AIDED TECHNICAL DRAWING
ITU

43. RES 112E – COMPUTER AIDED TECHNICAL DRAWING
SolidWorks is solid modeling CAD software that runs in MS Windows and is produced by Dassault Systemes. SolidWorks Corporation was founded in December 1993 by Jon Hirschtick. SolidWorks released its first product SolidWorks 95, in 1995.
SolidWorks is a parasolid-based solid modeler, and utiizes a parametric feature-based approach to create models and assemblies.
SolidWorks files use the Microsoft Sturctured Storage file format
Drawing files : SLDDRW
Part files : SLDPRT
Assembly files : SLDASM
RES 112E – COMPUTER AIDED TECHNICAL DRAWING
ITU

44. RES 112E – COMPUTER AIDED TECHNICAL DRAWING
SolidWorks
SolidWorks
SolidWorks
SolidWorks
SolidWorks
SolidWorks
SolidWorks
SolidWorks
SolidWorks
SolidWorks
SolidWorks
SolidWorks
by Dassault Systèmes SolidWorks Corp. (France)
RES 112E – COMPUTER AIDED TECHNICAL DRAWING
ITU

45. RES 112E – COMPUTER AIDED TECHNICAL DRAWING
Menu bar
Toolbars
View tools
Status bar
Graphic window
RES 112E – COMPUTER AIDED TECHNICAL DRAWING
ITU

46. RES 112E – COMPUTER AIDED TECHNICAL DRAWING
ITU

47. Web pages for CAD softwares
Autodesk home page Pro-Engineer CAD Software I-DEAS CAD software home page SolidWorks CAD software home pagewww.solidworks.com CATIA CAD software home page CADKEY software
RES 112E – COMPUTER AIDED TECHNICAL DRAWING
ITU

48. RES 112E – COMPUTER AIDED TECHNICAL DRAWING
Next week ….
You will learn basic geometry drawing and functions. The steps to follow are:
Screen Coordinates
Geometric Parameters
Geometry Creation (Line, Circle, Arc etc.)
Modification (move, copy etc)
Automatic Functions (dimensioning, cross-hatching etc.)
Management (zoom, layering etc.)
Assignment #1
Prepare a pen & a notebook ....
RES 112E – COMPUTER AIDED TECHNICAL DRAWING
ITU