Orthographic Projection, multi-view drawings, & Precedence of lines - PowerPoint PPT Presentation

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Orthographic Projection, multi-view drawings, & Precedence of lines

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  1. Orthographic Projection, multi-view drawings, & Precedence of lines 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.

  3. Section 1:Orthographic Projection & Multi-view Drawings

  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. Examples INCORRECT CORRECT

  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.

  16. Solution 1:

  17. Solution 2:

  18. Section 2:Line Types &Precedence of lines

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

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

  21. 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.

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

  23. Precedence of Lines:

  24. Example:

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

  26. Solution:

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

  28. Solution:

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

  30. Solution 1:

  31. Solution 2: