1. Engineering Drawing
ME 203

2. Introduction Course Aim Projection & assembly of mechanical elements
Draw different mechanical elements with suitable fits and tolerances

3. Introduction Course content Machine drawing standards
Threaded fasteners
Locking devices
Power screws
Springs
Keys and cotters
Bearings
Gears
Welding joints

4. Introduction Teaching and learning methods Student assessments
Lectures
Tutorial
Student assessments
9th week exam (written) %
Continues assessment (in class & homework, quizzes) %
Final assessment (written) %

5. Introduction Required books
Machine drawing (Third Edition), Dr. P. Kannaiah, Prof. K.L. Narayana and Mr. K. Venkata Reddy, New Age International (P) Ltd., Publishers, Published by New Age International (P) Ltd., Publishers, 2006

6. Introduction to Engineering Graphics Communication
Chapter one
Introduction to Engineering Graphics Communication

7. Development of Engineering Graphics
Product Data Management
(Solid Work)
Multiview Drawings
Francesca ( )
Production Lifecycle Management
Cartesian Coordinates
Descartes ( ).

8. Engineering Drawing

9. Graphic Language engineer must have proficiency in
language, both written and oral,
Symbols associated with basic sciences
graphic language.
Irrespective of language barriers, the drawings can be effectively used in other countries, in addition to the country where they are prepared. Thus, the engineering drawing is the universal language of all engineers.

10. Graphic Language Importance of graphic language
Build new structures
Create new machines
Representing the existing ones.
Without engineering drawing, it would have been impossible to produce objects
An engineer should posses good knowledge, not only in preparing a correct drawing but also to read the drawing correctly.

11. Classification of Drawing
Machine drawing

12. Classification of Drawing
Production drawing

13. Classification of Drawing
Part drawing

14. Classification of Drawing
Assembly drawing

15. Classification of Drawing
Detailed drawing

16. Classification of Drawing
Subassembly drawing

17. Classification of Drawing
Installation assembly drawing

18. Classification of Drawing
Installation for catalog drawing

19. Classification of Drawing
Assembly for instruction manual drawing

20. Classification of Drawing
Tabular Drawings

21. Classification of Drawing
Exploded assembly drawing

22. Classification of Drawing
Schematic assembly drawing

23. Classification of Drawing
Machine shop drawing

24. Classification of Drawing
Patent drawing

25. Chapter two
Principle of Drawing

26. Drawing sheet -Sheet Size

27. Drawing sheet-Sheet Size

28. Drawing sheet- Sheet Size
The basic principles involved in arriving at the sizes of drawing sheets are:
X : Y = 1 : 2
Example : A4 210:297 = 1: 2

29. Drawing sheet-Title block
The title block should lie within the drawing space
Containing the identification of the drawing
Location is at the bottom right hand corner.

30. Drawing sheet-Title block
The title block can have a maximum length of 170 mm.
providing the following information:
Title of the drawing
Sheet number
Scale
Symbol, denoting the method of projection
Name of the firm
Initials of staff drawn, checked and approved.

31. Drawing sheet-Title block

32. Drawing sheet-Title block
PHAROS UNIVERSITY , FACULTY OF ENGINEERING 20
Power Screw 15
TITLE:
DATE :
28/9/2013
SCALE:
1:2 10
Student
ROLL NO:
ID # / SEC #
NAME: 10
instructor
PLATE NO:
EVALUATED BY 10
Exe Sheet # Example 001 75
110
To be used in all drawings

33. Drawing sheet-Title block
20 mm
100mm 10

34. Drawing sheet-Title block
SCALE 1 : 1 for full size,
SCALE × : 1 for enlarged scales,
SCALE 1 : × for reduced scales.

35. Drawing sheet-Line

36. Drawing sheet-Line-application

37. Drawing sheet-Line-application

38. Drawing sheet-Line-application
Order of Priority of Coinciding Lines

39. Drawing sheet-Line-application
Order of Priority of Coinciding Lines

40. Drawing sheet-Line-application
Leader lines
A leader is a line referring to a feature (dimension, object, outline, etc.).
Leader lines should terminate with :
with a dot, if they end within the outlines of an object
with an arrow head, if they end on the outline of an object
without dot or arrow head, if they end on a dimension line

41. Drawing sheet-Line-application

42. Leader lines point to the corresponding part.
Balloons containing part numbers.

43. Balloons are placed in orderly horizontal or vertical rows.

44. The leader lines;
should not cross,
be as parallel as possible.

45. Sketching, Text, and Visualization

46. Examples of Sketches:
Multiview Sketch

47. Examples of Sketches: Pictorial Sketch
NOTE: There are also “technical sketches” used in industry which may include notes, and several versions that show motion.

48. Sketches use “proportion”, not scale!
Proportion allows the designer to use approximate values to create a balanced looking object.
Sketches are…accurate freehand drawings which use single lines to represent edges and features.
Multi-line sketching is NOT used in engineering design. (Scribbling!)

49. Question! How do you know when a sketch or CAD drawing is complete?
ANSWER: When the production people can make the part without having to ask you any questions!
Most drawings not only have views of the object, but also we include written notes and dimensions to aid in its production.

50. Projection types:
Drawings use various types of projection (how we view the object), to enhance our ability to visualize what we are being asked to see or understand.
Let’s look at the various styles of projection used…

51. Projection types:
Here’s how the same object may look using different projection styles.

52. Projection types:
Projection type is defined by the “line of sight” from the observer.
Let’s look at some of these…..

53. Perspective:
The line of sight is cone-shaped - which makes objects far away appear smaller to our view. Objects are not “true shape and size”.

54. Parallel:
The line of sight is always parallel regardless of how far away the object is from our view. This allows surfaces to be drawn “true shape and size”.

55. Orthographic:
Ortho means “at 90 degrees”, and is a form of parallel projection.
Orthographic projections are used to show several views of the same object in one drawing set.

56. Orthographic:
The “principle views “ should be chosen to show the most detail of the object with the least number of hidden lines.
Here, the TOP, FRONT, and RIGHT SIDE were chosen.

57. Understanding what Center Lines do…
Center lines show the theoretical perfect center of arcs, holes, and cylinders. They can be used to show symmetry, or used to aid in dimensioning an object.
Center lines NEVER start or stop on another line!

58. Steps in creating a 3-view sketch…
Layout the 3 principle views you have chosen with even margins between views and the outside border of your drawing area.
Step 2:
Rough out the general shape of each view.

59. Steps in creating a 3-view sketch…
Transfer any data from one view to its neighbor using “reverse construction”. This can be done by using a “miter line”.
Step 4:
Add hidden and center lines to the necessary views.

60. Steps in creating a 3-view sketch…
Erase all unnecessary lines and “snap” the lines on your views.
“Snapping” adds weight to the lines in each view and makes the drawing easier to read.
Step 6:
Add notes and/or dimensions to complete your drawing.

61. Here’s some tips on creating a multi-view drawing:
1. Lightly sketch all the information that you know first.
2. Use reverse construction to locate lines that may be
unknown such as compound angles.
3. Add all circles and other arcs to your drawing.
4. Snap all arcs and circles first, and then straight lines.

62. Tutorials Rules

63. Engineering Drawing Tools

64. Sketching Assignments