Orthographic and Isometric Lesson

Curriculum Plot Frame Criteria and Purpose Orthographic view creation and methods Isometric view creation and methods Hidden lines and how they are used Practice exercises for both views

Plot Frame Criteria

Orthographic Projection Orthographic means a single view. Each of the 6 images below is an orthographic projection of a different side. Most common drawings will only show the necessary amount of sides with the minimum being 3.

Orthographic View Orthographic Projection Isometric View

Orthographic Drawing

Isometric View USE PENCIL, very important as you will make mistakes. Drawing this one in pen took me 3 tries to make sure it would fit on the page, and all the lines were the right length. This is a very simple drawing too. Draw the Front using the appropriate 30 degree direction on your paper. Draw either the side or top depth going 90 degrees from your front drawing. Finish your drawing by closing all the sections.

Hidden Lines Explain how dashed lines are used to define something that is underneath a solid object.

Recap Drawings should have enough defining information listed Orthographic projections shows 2D view of a specific side and should line up as if the item was being unfolded Isometric shows a 30 degree offset view Hidden lines are dashed lines in orthographic projections Teachers will have some additional opportunities to work on these items.

Ending Notes Additional Problems: http://www.gr8lessons.com/files/OrthoIso.pdf http://www.msamc.org/assets/unit05_8_orthographic_projection_exercises.pdf