Chapter 13
description
Transcript of Chapter 13
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Chapter 13
Orthographic Sketching
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Describing an Angle Bracket
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Orthographic ProjectionOrthographic drawings represent three dimensional objects in three separate views arranged in a standard manner.
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Orthographic ViewsYou can adequately describe most objects with three orthographic views. Front Top Right
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Converting to Orthographic
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Orthographic Views –Line Types
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Line Types
Visible LineHidden LineCenter LineDimension LineConstruction Line
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Line Types
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Sketching Techniques
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Engineering Drawing SkillsLetteringLine TypesOrthographic ViewsPatience
See the example drawings in the notes.
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Engineering Drawing RulesAlways use a Pencil.Make all lettering the same size.Use Engineering or Drafting Paper.
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Orthographic ViewsYou can adequately describe most objects with three orthographic views. Front Top Right
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Sketching techniquesUse very light construction lines“Box in” the rough outline of the objectDarken only the lines you wish to keepClean up the edges and rough spots
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Orthographic Projection
2 Dimensional projections on Orthogonal planesShow lines based on change of plane or change of materialUse multiple linetypes Visible Hidden Center
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Describing an Angle Bracket
A relatively simple objectPictorial view may be difficult
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Glass Box concept
Envision the object surrounded in a glass boxProject the views out onto the pieces of glassEach pane shows a 2D projection of the object
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Completed Orthographics
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Projection Planes
The three panes of glass represent the principal orthographic planes Horizontal Frontal ProfileEach plane illustrates two of the principal dimensions: Height, Width, and Depth
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Class Exercise
As a team you have 3 minutes to discuss the following:What dimensions are contained on each of the principal projection planes?
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The Glass Box Approach
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Orthographic Projection
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Opening the Box
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Final Views
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Six Orthographic Views
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Laying Out All Six Views
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Three Primary Views
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View SelectionIf the object has an obvious top, then it must be the top viewMinimize the number of hidden linesUse the most descriptive view as the front viewConserve space by choosing the depth to be the smallest dimension
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Precedence of Lines
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Construction of Views
Must align orthographic viewsWidth appears in Top and FrontHeight appears in Front and SideDepth appears in Side and TopHeight and width project directlyDepth must be projected via a 45° angle
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Steps in Creating the Three-View Sketch
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Step 1 - Lightly Block Three Views
Use very light lines
for drawing in
the constructio
n lines
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Step 2 - Lightly Block Major Features
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Step 3 - Add Features, Use Miter Line
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Steps in Creating the Three-View SketchStep 4 - Add Final Lines
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Steps in Creating the Three-View SketchCompleted Sketch
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Think-Pair-ShareIn 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 listIn 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
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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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Object for exercise