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Chapter 13. Orthographic Sketching. Describing an Angle Bracket. Orthographic Projection. Orthographic drawings represent three dimensional objects in three separate views arranged in a standard manner. Orthographic Views.

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chapter 13

Chapter 13

Orthographic Sketching

orthographic projection
Orthographic Projection
  • Orthographic drawings represent three dimensional objects in three separate views arranged in a standard manner.
orthographic views
Orthographic Views
  • You can adequately describe most objects with three orthographic views.
    • Front
    • Top
    • Right
line types
Line Types

Visible Line

Hidden Line

Center Line

Dimension Line

Construction Line

engineering drawing skills
Engineering Drawing Skills
  • Lettering
  • Line Types
  • Orthographic Views
  • Patience

See the example drawings in the notes.

engineering drawing rules
Engineering Drawing Rules
  • Always use a Pencil.
  • Make all lettering the same size.
  • Use Engineering or Drafting Paper.
orthographic views1
Orthographic Views
  • You can adequately describe most objects with three orthographic views.
    • Front
    • Top
    • Right
sketching techniques1
Sketching techniques
  • Use very light construction lines
  • “Box in” the rough outline of the object
  • Darken only the lines you wish to keep
  • Clean up the edges and rough spots
orthographic projection1
Orthographic Projection
  • 2 Dimensional projections on Orthogonal planes
  • Show lines based on change of plane or change of material
  • Use multiple linetypes
    • Visible
    • Hidden
    • Center
describing an angle bracket1
Describing an Angle Bracket
  • A relatively simple object
  • Pictorial view may be difficult
glass box concept
Glass Box concept
  • Envision the object surrounded in a glass box
  • Project the views out onto the pieces of glass
  • Each pane shows a 2D projection of the object
projection planes
Projection Planes
  • The three panes of glass represent the principal orthographic planes
    • Horizontal
    • Frontal
    • Profile
  • Each plane illustrates two of the principal dimensions: Height, Width, and Depth
class exercise
Class Exercise
  • As a team you have 3 minutes to discuss the following:
  • What dimensions are contained on each of the principal projection planes?
view selection
View Selection
  • If the object has an obvious top, then it must be the top view
  • Minimize the number of hidden lines
  • Use the most descriptive view as the front view
  • Conserve space by choosing the depth to be the smallest dimension
construction of views
Construction of Views
  • Must align orthographic views
  • Width appears in Top and Front
  • Height appears in Front and Side
  • Depth appears in Side and Top
  • Height and width project directly
  • Depth must be projected via a 45° angle
step 1 lightly block three views
Step 1 - Lightly Block Three Views

Use very light lines for drawing in the construction lines

think pair share
Think-Pair-Share
  • In the next 1 minute as an Individual
  • if you could ask a question . . . specifically what don’t you understand about today’s topic what would it be. [at least 3 items should be listed]
  • Now take 2 minutes
  • to merge your list with the person sitting next to you AND add 1 new item to the list
  • In the next 5 minutes
  • share the results with the other half of your team, delete questions that you can answer for each other, AND prioritize the remaining questions your list
team exercise
Team Exercise
  • Complete three orthographic views of the object shown on the next slide.
  • Include visible, hidden, and center lines where appropriate.
  • Use the grid paper in the back of your book or your engineering sketch pad.
  • You will be given 7 minutes.
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