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Topics For Today

Topics For Today. Drawing No. 16 is due now Lab report due on at the beginning of your lab period Descriptive Geometry Read BTG Chapter 11, Section 5. Descriptive Geometry. Graphics representation of the plane, solid and analytical geometry used to describe real (or imagined) objects

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Topics For Today

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  1. Topics For Today • Drawing No. 16 is due now • Lab report due on at the beginning of your lab period • Descriptive Geometry • Read BTG Chapter 11, Section 5 Autumn Quarter

  2. Descriptive Geometry • Graphics representation of the plane, solid and analytical geometry used to describe real (or imagined) objects • It is the foundation, the underlying science of engineering technical drawings • Traditional methods for solving spatial design problems: • Direct view • Revolution • Fold-line Autumn Quarter

  3. Conventions and Definitions • Lines and planes extend to infinity while we work with a small portion which we define. • Lines and planes can be extended. • Dihedral angle – The angle between two planes – smaller of the two. It can be found by finding the line of intersection and looking at the line of intersection as a point. • Angle between a line and plane – This requires a view in which the plane is an edge and the line is true length. Autumn Quarter

  4. Line Types • Vertical, horizontal, or inclined • Top • Front • If a line is parallel to one of the principal projection planes, it’s called a principal line • Frontal (parallel to and true length in a frontal plane) • Horizontal • Profile TL TL TL Autumn Quarter

  5. Plane Types • Horizontal Plane (True Size Projection In Top Or Bottom Views) BT Top CT TS AT Front AF CF BF Autumn Quarter

  6. Descriptive Geometry - Planes • Vertical plane (appears as edge in top and bottom views) • Profile (appears as edge in front view and is parallel to profile projection plane) • Frontal (appears as edge in profile view and is parallel to frontal projection plane) Autumn Quarter

  7. Descriptive Geometry - Planes F N M Top L A B C E D D B D F F TS L TS N M C A E E Inclined (Not TS!!) Profile Frontal Autumn Quarter

  8. Descriptive Geometry - Planes Oblique (Not True Size Projection In Principal Views) Y Z X X Z Y Autumn Quarter

  9. Key to Descriptive Geometry Top Know the location of the origin (0,0,0) Front Right Side Autumn Quarter

  10. Descriptive Geometry with AutoCAD • Download a blank3d template – 4 viewports, 3D construction, world coordinates, cursor tracking – world • Layout mode – Transferring the model to paper – tab at the bottom of screen • The layout and the model or construction mode are all part of one file. Autumn Quarter

  11. Today’s Assignment • Download template from Web CT • Dwg 17 – SGAC-3-1 • Space Geometry in AutoCAD • Pierce point of a line and a plane • Due at end of class today • Consult handout – steps for solving problems in AutoCAD are provided • Dwg 18 – SGAC-3-2 • Space Geometry in AutoCAD • Intersection of Planes • Due at beginning of next lecture • Consult handout– steps for solving problems in AutoCAD are provided Autumn Quarter

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