1. Multiview drawings
AC-IDD-5. Students will create technical freehand sketches.
AC-IDD-11. Students will use orthographic projection to create and dimension multiview drawings.

2. Technical drawings/multiview drawings
GIVES CLEARER MORE ACCURATE DESCRIPTION OF OBJECT THAN A PICTURE OR WRITTEN DESCRIPTION
DRAW VIEWS OF THE OBJECT AS IT IS SEEN FROM DIFFERENT POSITIONS
VIEWS ARE ARRANGED IN A STANDARD ORDER

3. SIX VIEWS OF AN OBJECT MOST OBJECTS HAVE SIX SIDES/VIEWS:
TOP
BOTTOM
FRONT
REAR
RIGHT-SIDE
LEFT-SIDE
IN MOST CASES ONLY 2-3 VIEWS ARE NEEDED TO COMPLETELY SHOW THE SHAPE AND SIZE OF AN OBJECT

4. NORMAL VIEWS THREE MOST COMMON VIEWS:
FRONT: SHOWS WIDTH AND HEIGHT
TOP: SHOWS WIDTH AND DEPTH
RIGHT-SIDE: SHOWS DEPTH AND HEIGHT
ONLY NEED 3 VIEWS USUALLY BECAUSE SOME VIEWS GIVE THE SAME INFORMATION FOUND ON OTHER VIEWS

5. ORTHOGRAHIC PROJECTION
PROCESS OF PROJECTING 2 OR MORE VIEWS OF AN OBJECT ONTO IMAGINARY PLANES BY DRAWING LINES PERPENDICULAR FROM THE OBJECT TO THE PLANES
MADE WITH THREE PLANES:
VERTICAL/FRONTAL
HORIZONTAL
PROFILE
VIEWS THAT MAKE UP MULTIVIEW DRAWINGS ARE CREATED THROUGH ORTHOGRAPHIC
PROJECTION
PICTORIAL DRAWING IS THE 3D SHAPE
USED WHEN CREATING TECHNICAL
DRAWINGS

6. ANGLES OF PROJECTION FRONT
VERTICAL AND HORIZONTAL PLANES DIVIDE THE SPACE INTO 4 QUADRANTS
FIRST ANGLE PROJECTION: USED IN EUROPEAN COUNTRIES
THIRD ANGLE PROJECTION: USED IN THE U.S. AND CANADA
FRONT VIEW IS PROJECTED ONTO THE VERTICAL PLANE
TOP VIEW IS PROJECTED ONTO THE HORIZONTAL PLANE
RIGHT-SIDE VIEW IS PROJECTED ONTO THE PROFILE PLANE
Show vertical (front of face), horizontal (top of head), profile (side of face)
FRONT

7. DECIDING WHICH VIEWS TO USE
FRONT VIEW IS TYPICALLY THE ONE THAT SHOWS THE MOST CHARACTERISTICS OR IS THE LONGEST VIEW– ONLY CHOSEN VIEW
TOP AND RIGHT-SIDE VIEWS ARE CHOSEN BASED ON THE NORMAL POSITION OF THEIR RELATIONSHIP TO THE FRONT VIEW

8. Number of views to draw
WHEN AN OBJECT HAS A UNIFORM THICKNESS ONLY ONE VIEW IS NEEDED
AN OBJECT CAN BE SHOWN IN TWO VIEWS WHEN THE THIRD VIEW WOULD ADD NOTHING TO THE DESCRIPTION
A and B: top and front view are the same (use side and front)
C and D: top views are necessary (use top and front)

9. Curved surfaces CYLINDERS AND CONES DO NOT SHOW CURVES IN ALL VIEWS
THEY APPEAR AS CIRCLES IN ONE VIEW AND STRAIGHT LINES IN ANOTHER
CYLINDER APPEARS AS A CIRCLE IN ONE VIEW AND A RECTANGLE IN ANOTHER
CONE APPEARS AS A CIRCLE IN ONE VIEW AND A TRIANGLE IN ANOTHER
ANY OBJECT WITH A SPHERE WILL HAVE CIRCLES IN ALL VIEWS

10. Alphabet of Lines
Line symbols used in technical drawing are often referred to as ALPHABET OF LINES. The use of line symbols enables engineers/designers to express features of designed products clearly and accurately.  Line features vary not only by width but also by how they are graphically represented in a drawing. Line significance is conveyed by line weight or thickness of the line. Every line is drawn at different thickness and darkness to express contrast as well as importance. Lines that are less important are thin and light. Key to successful drafting is to have a good technical knowledge of these various line characteristics – to understand where and when to apply them in technical drawing.

11. Alphabet of Lines

12. Hidden lines NARROW, SHORT DASHED LINES DRAWN WITH 0.5MM F PENCIL
1/8 DASH, 1/32 GAP
SHOWS THE OUTLINE OF A FEATURE THAT CAN NOT BE SEEN IN A PARTICULAR VIEW
What do you notice that is different about the center lines in the front and top views than what we are accustomed to drawing?

13. Center Lines
Center A center line is drawn through the center of a feature (Figure 3- 5).

14. DIMENSIONING
DIMENSIONING COMMUNICATES SHAPE AND SIZE IN A CLEAR AND ACCURATE FASHION
EACH FEATURE OF AN OBJECT IS ONLY DIMENSIONED ONCE
SHOULD BE PLACED IN THE MOST DESCRIPTIVE VIEW OF THE FEATURE BEING DIMENSIONED (DO NOT DIMENSION HIDDEN LINES)

15. Alphabet of Lines

16. Alphabet of Lines

17. Multiview practice #1

18. Multiview practice – Getting Started
TOP
FRONT
RIGHT

19. Multiview practice #1 - answer

20. Multiview practice #2

21. Multiview practice #2 - answer

22. Multiview practice #3
HOW WOULD A HOLE BE INDICATED ON THE TOP AND RIGHT SIDE VIEWS THAT IS SHOWN IN THE FRONT VIEW AS A CIRCLE?
INCLUDE CENTER LINES

23. Multiview practice #3 - Answer
HOW WOULD A HOLE BE INDICATED ON THE TOP AND RIGHT SIDE VIEWS THAT IS SHOWN IN THE FRONT VIEW AS A CIRCLE?
INCLUDE CENTER LINES

24. Multiview practice #4

25. Multiview practice #4 - answer

26. Level of understanding: 1, 2, 3
ON THE BACK OF YOUR HANDOUT, MARK WHETHER YOU BELIEVE YOU ARE A 1, 2 OR 3
1: I NEED HELP OR I AM STILL STRUGGLING TO UNDERSTAND
2: I GET IT OR MOSTLY UNDERSTAND
3: I GET IT, LETS MOVE ON TO SOMETHING HARDER