Orthographic Drawing skills_Rev110107

Orthographic Drawing skills_Rev110107 - First-Year...

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First-Year Engineering Program Click to edit Master subtitle style  Session 4                Orthographic Projection Drawings Skills Objectives:   Demonstrate the use of line types and conventions Give a general procedure for converting isometric to  orthographic views Reference : “Technical Graphics”, Chap 3: Up to 3.14.5 Examples from : “Introduction to Graphics Communications for Engineers”, Bertoline 
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First-Year Engineering Program  Session 4                 P. 2 Why Do We Use the Orthographic  Projection Representation? Orthographic projection representations give  an accurate description of 3-D objects for  engineering, manufacturing, and construction Isometric representations are limited due to  using 2 dimensional medium to illustrate a   3- D object
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First-Year Engineering Program  Session 4                 P. 3 Defining Hidden and Center Lines for  Orthographic Projections Hidden Line – used to represent features  that cannot be seen in the current view Centerlines – used to represent symmetry  and to mark the center of circles and the axes  of cylinders, and the axes of symmetrical  parts, such as cylinders and bolts
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First-Year Engineering Program  Session 4                 P. 4 For Example: 1. Visible 2. Hidden 3. Center
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