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Engineering Drawing

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An engineering drawing, a type of technical drawing, which is used to fully and clearly define requirements for engineered items with scales. Engineering drawing ... – PowerPoint PPT presentation

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Title: Engineering Drawing


1
Engineering Drawing
2
What is engineering drawing
An engineering drawing, a type of technical
drawing, which is used to fully and clearly
define requirements for engineered items with
scales.
Engineering drawing example
3
Types of Drawings
All Drawings
Artistic
Technical
Sketches (conceptual)
Diagrams (design technical)
Drawings (technical/engineering)
simulated perspective
Multi view orthographic
Diagram (design plan)
Diagram (technical)
Isometric projection
Oblique projection
Less technical
More technical
4
Conceptual Sketches
  • When any idea comes in your mind, you draw a
    simple or rough drawing of the object without
    using any drawing instruments or tolls and this
    is called a conceptual sketch.

5
Importance of Engineering Drawings
  • Helps as a reference to workers, technicians or
    architects.
  • Easy to understand Since a picture is easiest
    method than thousand words, a technical drawing
    is a much more effective tool for engineers than
    a written plan.
  • Engineering drawings is used in all engineering
    fields, including, but not limited to, civil
    engineering, electrical engineering, mechanical
    engineering and architecture.

6
Sketch Vs Engineering drawing
  • Sketch made without drafting tools... Just
    pencil and paper. Scale is approximate, not
    accurate, but the sketch should still look like
    the object.
  • Engineering Drawing Made with drafting tools...
    Ruler, set squares, protractor and compass.
    Scale should be accurate and the drawing
    carefully made.

7
Projection
  • If straight lines are drawn from various points
    on the contour (A contour line is a imaginary
    line which connects points of equal elevation) of
    an object to meet a plane, the object is said to
    be projected on that plane.
  • The figure formed by joining, in correct
    sequence, the points at which these lines meet
    the plane, is called the projection of the
    object.
  • The lines from the object to the plane are called
    projectors.

8
Projection
9
Projection Types
  • Orthographic projection
  • Isometric projection

10
Orthographic projection
  • Orthographic Projection is a way of drawing an
    3D object from different directions.
  • Usually a front, side and plan view are drawn so
    that a person looking at the drawing can see all
    the important sides.
  • Orthographic drawings are useful especially when
    a design has been developed to a stage whereby it
    is almost ready to manufacture.

11
Orthographic projection views
OBJECT
12
Orthographic projection
  • As shown in the earlier slide, if an observer at
    position A  moves to infinity, the projectors
    to his eyes becomes parallel to the object and he
    observes the same shape and size as that of the
    object. The view so formed is known as the
    orthographic projection.
  • Similarly, the parallel projectors shall form
    the pictures on the respective picture planes
    from the positions B and C.

13
Isometric Projection
  • Isometric projection is a method for visually
    representing three-dimensional objects in two
    dimensions in technical and engineering drawings
  • Isometric drawings consist of two-dimensional
    drawings that are tilted at some angle to expose
    other views and give the viewer the illusion that
    what he or she is viewing is a three-dimensional
    drawing.

14
An Isometric Drawing
15
Comparison of Projections
Orthographic Isometric
Used for Drafting, maps, floor plans Technical drawings, drafting, conceptual sketches (sometimes) Used for Conceptual sketches, technical drawings (sometimes)
Orthographic is a set of 3 Plane Projections Isometric is a 3-D sketch
16
Diagrams
  • Diagrams are simplified versions of a drawing.
    Diagrams show how an object works, not
    necessarily how it looks.
  • Diagrams often use symbols rather than actual
    pictures to represent things.

17
A Circuit Diagram
  • Doesnt show what the circuit looks like, but
    tells an electrician how its all connected.
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