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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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