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ORTHOGRAPHIC PROJECTION

ORTHOGRAPHIC PROJECTION. Orthographic projection is a method of producing a number of separate two-dimensional inter-related views which are mutually at right angle to each other. Orthographic projection is based on : a. two principal planes - horizontal (HP) & vertical (VP)

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ORTHOGRAPHIC PROJECTION

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  1. ORTHOGRAPHIC PROJECTION Orthographic projection is a method of producing a number of separate two-dimensional inter-related views which are mutually at right angle to each other. Orthographic projection is based on : a. two principal planes - horizontal (HP) & vertical (VP) b. an auxiliary intersect each other forming right angles & quadrants. Two forms of orthographic projection: a. first-angle orthographic projection b. third-angle orthographic projection Three principal views in orthographic projection: a. Elevation (front elevation) b. Plan c. End view (side view, side elevation)

  2. Orthographic projection - First angle orthographic projection - Third angle orthographic projection B Elevation A First angle VP C HP D F Plan E Third angle

  3. First-angle Projection An object is placed in the space of the first-angle quadrant between two planes. The view projected on the VP is called ELEVATION. The view projected on the HP is called PLAN. The view projected on the AVP is called END VIEW. Relative position of the three principal views: END VIEW ELEVATION END VIEW PLAN First-angle projection symbol: refer to BS308:1985

  4. Elevation Elevation

  5. Elevation Plan Plan Elevation

  6. Elevation End View 1 Plan Plan End View 1 Elevation

  7. Elevation End View 2 End View 1 Plan End View 2 Plan First angle orthographic projection End View 1 Elevation

  8. End

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