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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Orthographic projections Conventions and projections of simple solids

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Orthographic Projections Lines are used to construct a drawing. Various type of lines are used to construct meaningful drawings. Each line in a drawing is used to convey some specific information.  The types of lines generally used in engineerign drawing is shown in Table Types of lines generally used in drawings All visible edges are to be represented by visible lines. This includes the boundary of the object and  intersection between two planes. All hidden edges and features should be represented by dashed lines.  Figure  shows the orthographic front view  (line of sight in the direction of arrow)of an object. The external boundary of the object is a rectangle and is shown by visible lines.  In Figure, the step part of the object is hidden and hence shown as dashed lines while for the position of the object shown in figure, the step part is directly visible and hence shown by the two solid lines. shows the pictorial view and front view of the object when ...
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