ENGN103 ENGINEERING DRAWING ORTHOGRAPHIC · PDF fileTriangle of sides 40mm, ... Hexagon of...

Click here to load reader

  • date post

    22-Apr-2018
  • Category

    Documents

  • view

    223
  • download

    4

Embed Size (px)

Transcript of ENGN103 ENGINEERING DRAWING ORTHOGRAPHIC · PDF fileTriangle of sides 40mm, ... Hexagon of...

  • L E C T U R E 3

    ENGN103 ENGINEERING DRAWING

    ORTHOGRAPHIC PROJECTIONS

  • WHAT IS ORTHOGRAPHIC PROJECTION?

    Orthographic Projection is a method of

    representing a three dimensional object on paper

    using several two dimensional views.

    It is the international language of Engineers and

    Designers

    http://www.tech.plym.ac.uk/sme/cad/vrml/house_1st.htm

  • Front elevation Side elevation

    Plan Top view

  • ORTHOGRAPHIC PROJECTION- SIMPLE SHAPES

    1. Rectangle of sides 50 x 35 mm resting on HP.

    2. Rectangle of side 50 x 35 mm, with short edge on HP. 10mm

    away from PP and 5mm away from VP.

    3. Rectangle of side 50 x 35 mm, with short edge on HP. 10mm

    away from PP and 5mm away from VP. Inclined at 30degree to

    VP.

    4. Rectangle of sides 50 x 35 mm, with one corner on HP. Making

    30degree and 60degree with HP.

    corner

    Short edge

    Long edge

  • ORTHOGRAPHIC PROJECTION- SIMPLE SHAPES

    Draw the orthographic projections:

    1. Circle of radius 25mm resting on HP, 10mm away

    from VP and PP.

    2. Triangle of sides 40mm, 15mm and 35mm. 7.5mm

    away from PP, 10mm away from VP and 7.5mm

    above HP.

    3. Hexagon of side 25mm. 10mm away from VP.

    4. Rectangle of sides 35mmx60mm lying flat on HP. A

    square of side 25mm is resting on the rectangle

    with its corner on the center of the rectangle.

  • DRAW ORTHOGRAPHIC PROJECTIONS:

    Cube of side 45mm with a whole of 10mmx10mm in

    the center of one of the sides.

    Triangular Pyramid of sides 30mm and height 55mm.

    A cone of base radius 20mm and height 40mm.

    Resting on the corner

    A cylinder of base radius 15mm and length 55mm.

    Resting on the side.

  • ORTHOGRAPHIC PROJECTION OF OBJECTS

    Front elevation Side elevation

    Plan Top view Isometric view

  • Width Depth

    Height

    Width

    He

    igh

    t

    Depth

    Depth

    Wid

    th

    He

    igh

    t

    FRONT ELEVATION SIDE ELEVATION

    PLAN

  • FRONT ELEVATION SIDE ELEVATION

  • FRONT ELEVATION SIDE ELEVATION

    PLAN

  • FRONT ELEVATION SIDE ELEVATION

    PLAN

  • FRONT ELEVATION SIDE ELEVATION

    PLAN

  • FRONT ELEVATION SIDE ELEVATION

    PLAN

  • CENTERLINES

  • PRECEDENCE OF LINES

    FRONT ELEVATION SIDE ELEVATION

    PLAN

  • PLAN

    SIDE ELEVATION FRONT ELEVATION