Examples of Sections Views

Examples of Sections Views
















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Projections of Points in 2nd, 3rd and 4th Quadrant

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Point in the Second quadrant Point P is 30 mm above HP, 50 mm behind VP and 45 mm in front of left PP. Since point P is located behind VP, the VP is assumed transparent.  The position of the point w.r.t the three planes are shown in Figure 1.  The direction of viewing are shown by arrows. After projecting the point on to the three planes, the HP and PP are rotated such that they lie along the VP. The direction of rotation of the HP  and PP is shown in figure 2. As shown in figure 3, after rotation of the PP and HP, it is found that the VP and HP is overlapping. The  multi-view  drawing for the point P lying in the second quadrant is shown in figure 4. Though for the projection of a single point, this may not be a problem, the  multi-view  drawing of solids, where a number of lines are to be drawn, will be very complicated. Hence second angle projection  Technic  is not followed anywhere  for engineering drawing. Figure 1. ...
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Theories of Projections

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Theory of Projections   Projection theory In engineering, 3-dimensonal objects and structures are represented graphically on a 2-dimensional media. The act of obtaining the image of an object is termed “projection”.  The image obtained by projection is known as a “view”.  A simple projection system is shown in figure 1. All projection theory are based on two variables: ·                   Line of sight ·                   Plane of projection. Plane of Projection A plane of projection (i.e, an image or picture plane) is an imaginary flat plane upon which the image created by the line of sight is projected.  The image is produced by connecting the points where the lines of sight pierce the projection plane. In effect, 3-D object is transformed into a 2-D representation, also called projections. The paper or...
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