logging in or signing up Projection Systems Ortho and Iso Sigfrid Download Post to : URL : Related Presentations : Share Add to Flag Embed Email Send to Blogs and Networks Add to Channel Uploaded from authorPOINTLite Insert YouTube videos in PowerPont slides with aS Desktop Copy embed code: Embed: Flash iPad Dynamic Copy Does not support media & animations Automatically changes to Flash or non-Flash embed WordPress Embed Customize Embed URL: Copy Thumbnail: Copy The presentation is successfully added In Your Favorites. Views: 2507 Category: Entertainment License: All Rights Reserved Like it (3) Dislike it (2) Added: January 09, 2008 This Presentation is Public Favorites: 0 Presentation Description No description available. Comments Posting comment... 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Edit Comment Close Premium member Presentation Transcript Engineering H191Engineering Fundamentals and Laboratory I: Engineering H191 Engineering Fundamentals and Laboratory I Week 02 Day 02 Projection Systems: Orthographic and IsometricObjectives: Objectives Orthographic Projections View Selection Glass Box Approach First and Third Angle Projections Line Precedence Two View Drawings Tips Orthographic Projections: Orthographic Projections Reference: Technical Graphics, Chap 3: Advantage – Represent features of an object more accurately Example Problem Orthographic Projections: Orthographic Projections Orthographic Projections are a collection of 2-D drawings that work together to give an accurate overall representation of an object.Defining the Six Principal Views or Orthographic Views: Defining the Six Principal Views or Orthographic ViewsWhich Views to Present?: Which Views to Present? General Guidelines Pick a Front View that is most descriptive of object Normally the longest dimension is chosen as the width (or depth) Most common combination of views is to use: Front, Top, and Side View Any other view different from the Principal Views is called an Auxiliary View (see 3.15 in the Technical Graphics text)Glass Box Approach: Glass Box Approach Most powerful technique to understand orthographic projections Suspend the object with transparent strings inside a glass box Freeze the view from each direction (each of the six sides of the box) and unfold the box Animation illustrates glass-box approachGlass Box Approach: Glass Box Approach Available on the FEH website: http://feh.eng.ohio-state.edu Lecture Notes Engineering H191 – Autumn 2005 Glass Box AnimationGlass Box Approach: Glass Box ApproachGlass Box Approach: Glass Box ApproachGlass Box Approach: Glass Box ApproachGlass Box Approach: Glass Box ApproachGlass Box Approach: Glass Box ApproachGlass Box Approach: Glass Box ApproachFirst and Third Angle Projections: First and Third Angle Projections First Angle – International Third Angle – U.S.Conventional Orthographic Views: Conventional Orthographic ViewsIs The Orthographic View OK?: Is The Orthographic View OK? Orthographic Must Be In Projection: Orthographic Must Be In Projection Hidden and Center Lines: Hidden and Center LinesFor Example:: For Example: 1. Visible 2. Hidden 3. CenterPrecedence of Lines: Visible lines takes precedence over all other lines Hidden lines and cutting plane lines take precedence over center lines Center lines have lowest precedence Precedence of LinesExample: Application of Precedence : Example: Application of Precedence Intersecting Lines in Orthographic Projections: Intersecting Lines in Orthographic Projections Solid Line Intersections Dashed Line Intersections Reference – Technical Graphics, Chapter 3Two-View Drawings: Two-View Drawings Some objects can be fully described by two views, look for: Symmetry or Bodies of Rotation Front View Right Side View Front View Right SideOther Two-View Examples: Other Two-View ExamplesSummary: Summary Introduced to orthographic projections We recommend the software animation exercise introduced in class. Animation can be found on Carmen – Glass Box Theory. Review Questions: Review Questions Rectilinear grids are used for sketching isometric pictorials … True/False Based on the lines of sight, orthographic projection drawings are classified as ___________ projections There are ____ standard principal views of orthographic projections Each view in an orthographic projection concentrates on ____ dimensions of the objectHints for Orthographic Projection Sketching: Hints for Orthographic Projection Sketching Identify the major features and overall dimensions of the object Do not use any straight-edge devices as a pencil guide when sketching by hand Start by drawing bounding boxes with light construction lines. Keep views aligned while sketchingHints for Orthographic Projection Sketching: Hints for Orthographic Projection Sketching Title Information is required – follow conventions Usage of construction lines is encouraged. Mandatory for circle or ellipse Orthographic projection: Alignment of the views is important! Will not be graded, if not alignedHints for Orthographic Projection Sketching: Hints for Orthographic Projection Sketching Map inclined and oblique faces to all three views Follow the precedence of lines Darken all visible, hidden, and center linesSketching a Circle: Sketching a Circle Draw a square whose sides are the diameter of the circle. At the center of each side define the point of tangency for the circle. Draw the diagonals of the square. Orient the paper so you can draw equal arcs to construct the circleToday's Assignment: Today's Assignment A11 TG 2.7 and 2.18 You do not have the permission to view this presentation. In order to view it, please contact the author of the presentation.