Point a is 35mm above the hp and 20mm in front of the vp. Its center is 3 cm above the hp and 2 cm in front of the vp. An useful slideshow for all 1st year engineering students, who are afraid of the. The plate is seen as a rhombus in a plane with other diagonal measure 30 mm. When the bulb is switched on the image of the black spot falls on one of the corner. Parallel projections for parallel projections, we specify a direction of projection dop instead of a cop. Graphics language word language line types geometric construction lettering projection method. A 3d projection or graphical projection maps points in threedimensions onto a twodimensional plane. Orthographic projection 2 1 orthographic projection in chapter 2 you will learn the importance of engineering graphics and how to create an orthographic projection. Since the line is 70 mm in front of the right pp draw the x1y1 line at a distance of 70 mm on the right side of the front view.
Engineering graphics projection of points and lines. Apr 19, 2020 engineering graphics complete notes, 1st semester edurev notes is made by best teachers of. Using the construction line command in autocad to draw. Draw the projections of ab and show its inclinations with the h. The line measures 80 mm long and inclined at an angle of 300 to. Engineering graphics projection of points, projection of lines slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. The projections of a straight line are obtained by joining the top and front. Conversion of pictorial view into orthographic views 7. Chapter 4 orthographic projection and multiview constructions. Draw the projection of plate and determine the angle it make with hp. The lengths shown at the line pa are the isometric lengths to be used to draw the isometric. Projection of straight lines in engineering graphics pdf in engineering drawing practice two principal planes are used to get the. As graphics are usually displayed on twodimensional media such as paper and computer monitors, these projections are widely used, especially in engineering drawing, drafting, and computer graphics.
If you continue browsing the site, you agree to the use of cookies on this website. Lines on an engineering drawing signify more than just the geometry of the object and it is. Here you can download the free engineering graphics pdf notes eg pdf notes materials with multiple file links to download. Support me pursue my passion of creating great quality videos on engineering. To draw the projections of a straight line located at different positions with respect to the vp and the hp. Project the top view of the line which will be a point ab at a distance of 60 mm below xy line. Draw the projection of a circle of 5 cm diameter, having its plane vertical and inclined at 30 to the vp.
All these cases have been discussed assuming the line to be in the first quadrant. Syllabus frame 2 plane curves and free hand unit 1 sketching projection of points, lines and unit 2 plane surfaces projection of solids unit 3 projection of sectioned solids unit 4 and development of surfaces isometric and perspective unit 5 projections engineering graphics 1. Different line types are used to indicate visible, hidden and symmetry lines. Download ge8152 engineering graphics lecture notes, books, syllabus parta 2 marks with answers ge8152 engineering graphics important partb 16 marks questions, pdf books, question bank with answers key. Location of a line the location of a line in projection quadrants is described by specifying the distances of its end points from the vp, hp and pp. Projections of lines parallel and inclined to both planes. Orthographic projection in chapter 1 you will learn the importance of engineering graphics and how to create an orthographic projection. The central plane is 60mm away from the axis of the prism towards. Projecton of points,projection of straight line,straight line. Let us first assume that the plane is perpendicular to hp and parallel to vp. Draw the projections of the line if it is 40 mm above the hp.
The projections of a straight line are obtained by joining the top and front views of. A straight line 55 mm long makes an angle of 30 deg to the hp and 45 deg to the vp. Its end point a is 10 mm from the hp and 15 mm from the vp. This placement of views is called thirdangle projection. Draw the projections of the line ab, assuming it to be located in all the four quadrants by turns. Engineering graphics and autocad 41 chapter 4 orthographic projection and multiview constructions understand the basic orthographic projection principles. Dear friends, here with i upload videos regarding subjects li.
Engineering graphics 1st yr projection of points and lines. It is a two dimensional representation of a three dimensional object. Unit title time 1 plane curves and free hand sketching 19 2 projection of points, lines and plane surfaces 17 3 projection of solids 16 4 projection of sectioned solids and development of surfaces 16 5 isometric and perspective projections 17 revision 5 engineering graphics. Orthographic projection, common method of representing threedimensional objects, usually by three twodimensional drawings in each of which the object is viewed along parallel lines that are perpendicular to the plane of the drawing. Engineering graphics projection of points and lines jayanshu gundaniya. Engineering drawing lecture 6 16082011 projection of points and 1 projection of lines indian institute of technology guwahati. A straight line is the shortest distance between two points. Projection of regular planes, plane inclined to both reference planes. A rectangular prism 25mm30mm side and 50mm long is lying on the ground plane on one of its rectangular faces in such a way that one of its end face is parallel to and 10mm behind the picture plane.
Traces of a line inclined to one plane and parallel to the other. As long as the line is inclined at f to vp, whatever may be the position of the line i. Add perspective lines using the vanishing point as a guide for creating the proper angle. The nearest end of the line is 25 mm in front of the vp. An orthographic projection describes the shape of an object. Introduction to engineering graphics 1 which tool can be used to draw a 90 degree angle. Similarly repeat this process by taking again 5mm to right and left and locate p 3 p 4.
Projections projections transform points in nspace to mspace, where m projection plane pp along. When the line is inclined to one plane and parallel to the other, the trace of the line is obtained only on the plane to which it is inclined, and no trace is obtained on the plane to which it is parallel. A straight line may have different orientations in space well be positioning this. For example, an orthographic projection of a house typically. All three types are equally simple with computer graphics. Draw the projections of a pentagonal prism, base 25 mm side and axis 50 mm long. Pdf ge8152 engineering graphics lecture notes, books. Engineering graphics notes pdf eg notes pdf starts with the topics covering concepts and conventions, importance of graphics in engineering applications, geometrical drawing, drawing instruments and materials, mini drafter, drawing papers, drawing pencils, layout.
Determination of true length and true inclinations of straight lines from the projections not involving traces projection of plane surfaces like rectangle, square. Projection of solids projection of solids engineering graphics module 3. A 3060 triangle b protractor c drafting machine d all of the above. Orthographic projection and multiview constructions 45 in engineering graphics, the projection of one face of an object usually will not provide an overall description of the object. So in top view a straight line and in front view the circle. A point is behind the frontal plane by d units and below the horizontal plane by h units. A line ab, 65 mm long, has its end a 20 mm above the h. A line ab 25mm is parallel to the vp and perpendicular to the hp. Importance of graphics in engineering applications.
Line lying on two principal planes of projection will appear normal true length tl in two views. Engineering graphics projection of points and lines slideshare. Thus projection of a straight line is the foundation of engineering drawing. An electric bulb hangs in the center of the ceiling and 1m below it.
Projection of points there are basically nine type of projections of point is space. Fill the following dotted orthographic projection with the appropriate line types. Projection of straight lines in engineering graphics pdf. A line lying in one principal plane will appear normal in one view. Projections of solids placed in different positions. The end a is 12 mm in front of the vp and 15 mm above hp. Engineering graphics projection of points, projection of lines.
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