1. North Carolina State University Spring 2013

2. What You Will Learn:  Define Orthographic Projection.  Correctly label the placement of the six standard views of an object drawing.  Identify which views are needed when creating a multi-view drawing of an object.  Create a multi-view drawing with the correct views from a given object.  Identify different types of lines used for drafting.  Identify which line types have precedence over others.  Create multi-view drawings using different line types.

4. Orthographic Projection  Orthographic Projection: (n) a parallel projection technique that creates a 2-D image of 3-D objects or structures on an image plane perpendicular to the lines of sight.  In The U.S. we use a method called Third Angle Projection  Used to represent all aspects of a 3-D object by only using 2-D drawings

5. Glass Box Method  View each object as if it were in a glass box.  When unfolding the box you have the 6 views of projection.

6. The 6 Views of Projection  Top – Looking down on an object (birds eye view)  Front – ALWAYS the most descriptive  Right Side – To the right of the front view  Bottom – opposite of the top  Left Side – opposite of the right  Back – opposite of the front

7. Proper Layout of a Multi-View  Each view has a specific location as to where it is placed in reference to others.

8. Creating a Multi-View Drawing  Only use the views necessary to visualize the full object. (Typically: top, front, right side)  Sometimes only two views are necessary such as when drawing a cylinder

9. Examples

10. INCORRECTCORRECT

11. Guided Practice:  Create a multi-view drawing of this object.  Label each view of your drawing.

12. Solution:

13. Guided Practice:  Create a multi-view drawing of this object.  Label each view of your drawing.

14. Solution:

15. Independent Practice:  Create a multi-view drawing of the following two objects.  Label each view of your drawings.

17. Solution 1:

18. Solution 2:

20. Visible Lines:  Thick and Bold  Often called construction lines or object lines  Used for the outer edges and visible features of an object.

21. Hidden Lines:  Thin, dashed line  Used to show hidden features within an object which can not be seen from the outside of the object.

22. Center Lines:  Thin lines with alternating long and short dashes.  Show the center of both visible and hidden circular features such as holes, cylinders, etc.

23. Precedence of Lines  Precedence of Lines: The order in which different line types appear in an drawing based on importance.

24. Precedence of Lines:

25. Example:

26. Guided Practice:  Create a multi-view drawing of this object.  Label each view of your drawing.  Include visible, hidden, and center lines

27. Solution:

28. Guided Practice:  Create a multi-view drawing of this object.  Label each view of your drawing.  Include visible, hidden, and center lines

29. Solution:

30. Independent Practice:  Create a multi-view drawing of the following two objects.  Label each view of your drawings.  Include visible, hidden, and center lines

32. Solution 1:

33. Solution 2: