1. Drafting I – Coach Pennington
Multi-View Drawing
Drafting I – Coach Pennington
3.02 Apply 2D sketching skills – Single & Multi-View

2. What is Multi-View Drawing?
A system that allow the construction of a two- dimensional (2D) drawing of a three-dimensional (3D) object.

3. Orthographic Projection
Another name for Multi-View Drawing
Requires the development of Visualization skill
Ability to “SEE” an object clearly in the “MIND’S EYE”

4. Viewing Objects Imagine a box is surrounding an object
Each side of the box represents one (1) named plane
Front *
Top *
Right Side *
Left Side
Bottom
Rear

5. Viewing Objects
Lines are “Projected” onto these planes creating images or “Views”
Six (6) views can be formed in this manner
Front *
Top *
Right Side *
Left Side
Bottom
Rear

6. Viewing Objects Unfolding the box produces a “Layout” of the sides
This develops the “Multiple” “Views” associated with an object

7. Viewing Objects
Each “View” is placed in a constant location relative to other “Views”
Each “View” must be placed in its correct location
“Views” and features must be aligned

8. Choosing Views Most common “Views”
Front
Top
Right Side
Most descriptive “View” is designated as Front

9. Choosing Views Not every object requires 3 views
Some require less, some more
Ex: Soda Can = 2 Views
Ex: Eraser Shield = 1 View
Carefully select and position views to ACCURATELY describe an object

10. Normal Surfaces
Always appears as an Edge in two (2) of the standard views of an object

11. Inclined Surfaces
Appears as an Edge in one (1) view, and as a Foreshortened (not true sized) surface in two (2) standard views

12. Oblique Surfaces NEVER appears as an Edge.
Will always appear foreshortened in ALL of the standard views

13. Curved Surfaces Curves often DO NOT appear as curves in ALL views
Circles look like lines
Cylinders look like rectangles
Cones look like triangles

14. Understanding & Reading the Views

15. Object Dimensions All objects have three (3) dimensions Height Width
Distance from Bottom to Top
Width
Distance from Left side to Right side
Depth
Distance from Front to Rear

16. Object Dimensions
Each “View” will show two (2) of the three (3) major dimensions
Front
Width & Height
Top
Width & Depth
Right Side
Height & Depth

17. Line Types Line types become MORE important in multi-view drawings
Each line type tells a separate part of a larger story
Visible Lines
Identify edges and features that CAN be seen
Center Lines
Locate the center of circular objects
Identify an axis of symmetry
Hidden Lines
Locate edges and features that CAN NOT be seen

18. Line Type Rules Alphabet of Lines
Visible lines take president
Hidden lines more important then Center lines
Layers assist in organization of line types

19. Construction Process

20. Construction Process
Identify the base values for Height, Width, & Depth
H = 3.00
W = 5.13
D = 2.00
Identify desired spacing between views
S = 1.5

21. Construction Process Identify TOTAL Horizontal Distance:
W+D+S=TOTAL Horiz.
=8.63
This is the TOTAL WIDTH needed in AutoCAD to begin the layout process
Identify TOTAL Vertical Distance:
H+D+S=TOTAL Vert.
=6.50
This is the TOTAL HEIGHT needed in AutoCAD to begin the layout process

22. Construction Process
Use the original Height, Width, Depth, & Spacing to layout the standard “Views”
H = 3.00
W = 5.13
D = 2.00
S = 1.50

23. Construction Process Identify the “Miter Line”
Allow for the transfer or dimensions between the Top & Right Side
Draw at 45 degrees off the FRONT

24. Construction Process Trim away unnecessary information
Keep the outlines for each view and the miter line

25. Construction Process Develop the general outline of the figure
Start with the Front view

26. Construction Process Project new corners into other views
Trim away unnecessary information

27. Construction Process Identify secondary features Circles? Holes?
Cutouts?

28. Construction Process Project new information into other views
Use layers to organize lines

29. Construction Process Clean up drawing Trim excess lines
Center lines must pass through the object they describe
Remove the miter line

30. Orthographic Projection

31. Orthographic Projection
The term orthographic projection means to “throw forward at right angles and draw”.
In the term “orthographic projection”, the “graphic” refers to be written or drawn.
Orthographic projection involves the use of three planes, which are horizontal, frontal, and profile.

32. Orthographic Projection
Steps to completing a Multiview Drawing
Open the Border
What are the 3 Dimensions that you have to know to make a Multiview
Height
Width
Depth

33. Orthographic Projection
Steps to completing a Multiview Drawing
Figure your Horizontal Distance – W+D+S=/2
Figure your Vertical Distance – H+D+S=/2
Offset ½ the Horizontal Distance from the Vertical Center Line in each Direction
Offset ½ the Vertical Distance from the Horizontal Center Line in each Direction
Erase the Center Lines

34. Orthographic Projection
Steps to completing a Multiview Drawing
Now Trim your box.
Offset the Width Dimension of the Front View
Offset the Height Dimension of the Front View
Now Offset the Space between the views to the top and the right side that distance is 2.00
Now Draw the Miter Line from the corner of the front view @6<45 (What is the Purpose of the Miter Line?

35. Orthographic Projection
Steps to completing a Multiview Drawing
Now you are ready to begin adding the features to your drawing. Start with the front view.
Remember Where ever there is a point in one view it must appear a line in another view.
Remember Center Lines must be ¼ inch outside the object lines

36. Complex & Tangent Surfaces

37. Tangent Intersections
When a curved surface it tangent to a plane surface, NO line is drawn where they join.

38. Tangent Intersections
When a plane surface intersects a curved surface, DRAW an edge line where they join.

39. Tangent Intersections
When a secondary plane surface connects AND is tangent to two (2) curves, a line will be formed ONLY if the surface is vertical or horizontal.