Projections of lines parallel and inclined to both planes. Line lying on two principal planes of projection will appear normal true length tl in two views. Fill the following dotted orthographic projection with the appropriate line types. An useful slideshow for all 1st year engineering students, who are afraid of the. A point is behind the frontal plane by d units and below the horizontal plane by h units. Parallel projections for parallel projections, we specify a direction of projection dop instead of a cop. A straight line is the shortest distance between two points. If you continue browsing the site, you agree to the use of cookies on this website. Draw the projection of plate and determine the angle it make with hp. 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. Similarly repeat this process by taking again 5mm to right and left and locate p 3 p 4. An orthographic projection describes the shape of an object. Its end point a is 10 mm from the hp and 15 mm from the vp.
Engineering graphics projection of points and lines slideshare. Draw the projections of ab and show its inclinations with the h. Introduction to engineering graphics 1 which tool can be used to draw a 90 degree angle. Chapter 4 orthographic projection and multiview constructions. Projections of solids placed in different positions. Orthographic projection in chapter 1 you will learn the importance of engineering graphics and how to create an orthographic projection. 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. 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. Engineering graphics and autocad 41 chapter 4 orthographic projection and multiview constructions understand the basic orthographic projection principles. Determination of true length and true inclinations of straight lines from the projections not involving traces projection of plane surfaces like rectangle, square. Let us first assume that the plane is perpendicular to hp and parallel to vp. So in top view a straight line and in front view the circle. Projection of points there are basically nine type of projections of point is space. Its center is 3 cm above the hp and 2 cm in front of the vp.
Engineering graphics projection of points, projection of lines slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. Projection of regular planes, plane inclined to both reference planes. A line ab, 65 mm long, has its end a 20 mm above the h. Orthographic projection 2 1 orthographic projection in chapter 2 you will learn the importance of engineering graphics and how to create an orthographic projection. Engineering graphics projection of points, projection of 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.
Dear friends, here with i upload videos regarding subjects li. 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. Projection of straight lines in engineering graphics pdf. Point a is 35mm above the hp and 20mm in front of the vp. A line lying in one principal plane will appear normal in one view. The projections of a straight line are obtained by joining the top and front. 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. Here you can download the free engineering graphics pdf notes eg pdf notes materials with multiple file links to download. Projection of straight lines in engineering graphics pdf in engineering drawing practice two principal planes are used to get the. A 3d projection or graphical projection maps points in threedimensions onto a twodimensional plane. Pdf ge8152 engineering graphics lecture notes, books. A line ab 25mm is parallel to the vp and perpendicular to the hp.
Draw the projection of a circle of 5 cm diameter, having its plane vertical and inclined at 30 to the vp. As long as the line is inclined at f to vp, whatever may be the position of the line i. Engineering drawing lecture 6 16082011 projection of points and 1 projection of lines indian institute of technology guwahati. Projecton of points,projection of straight line,straight line. An electric bulb hangs in the center of the ceiling and 1m below it. Projection of solids projection of solids engineering graphics module 3. Engineering graphics projection of points and lines jayanshu gundaniya. A straight line may have different orientations in space well be positioning this. Project the top view of the line which will be a point ab at a distance of 60 mm below xy line.
Support me pursue my passion of creating great quality videos on engineering. It is a two dimensional representation of a three dimensional object. Draw the projections of a pentagonal prism, base 25 mm side and axis 50 mm long. Importance of graphics in engineering applications.
Graphics language word language line types geometric construction lettering projection method. When the bulb is switched on the image of the black spot falls on one of the corner. For example, an orthographic projection of a house typically. Using the construction line command in autocad to draw. Engineering graphics projections of a straight line. To draw the projections of a straight line located at different positions with respect to the vp and the hp. The plate is seen as a rhombus in a plane with other diagonal measure 30 mm. Different line types are used to indicate visible, hidden and symmetry lines. All three types are equally simple with computer graphics. Add perspective lines using the vanishing point as a guide for creating the proper angle. 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. Draw the projections of the line ab, assuming it to be located in all the four quadrants by turns. The line measures 80 mm long and inclined at an angle of 300 to.
Thus projection of a straight line is the foundation of engineering drawing. Traces of a line inclined to one plane and parallel to the other. Projection of plane lecture 4 engineering graphics and. Draw the projections of the line if it is 40 mm above the hp. The end a is 12 mm in front of the vp and 15 mm above hp. A straight line 55 mm long makes an angle of 30 deg to the hp and 45 deg to the vp. Conversion of pictorial view into orthographic views 7. All these cases have been discussed assuming the line to be in the first quadrant. 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. Engineering graphics 1st yr projection of points and lines. The nearest end of the line is 25 mm in front of the vp. The central plane is 60mm away from the axis of the prism towards. Lines on an engineering drawing signify more than just the geometry of the object and it is. Engineering graphics projection of points and lines.
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