341 Important keypoints and notation in engineering graphics. The engineering drawing common to all engineering trades as per nsqf 1st semester is the outcome of the collective efforts of experts from field institutes of dgt champion itis for each of the sectors, and. 1 both methods are based on projection theory, which has taken many years to evolve the rules used today. Through this point draw a perpendicular line to xy and mark the top view a at a distance of 300 mm below xy. Plane- any surface in different shape like square, circle, triangle, pentagon and hexagon. Solid? Ans- line- joining of shortest distance b/w two points forms a line. 3 of large areas can by hatchlng of g sectional view and cutting plane by a. Imaginary lines of sight called projectors the two broad types of projections, both with several sub-classifications, are parallel projection and perspective projection. Eg pdf notes materials with multiple file links to download. 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. In other words, a line will show true length in an auxiliary view where the direction of sight is perpendicular to the line.
It is a two dimensional representation of a three dimensional object. Ktu engineerign graphics text book pdf download for reference. 1008 Vp, draw its projections,find tl, inclinations of line with hp. A straight line ab 20 mm long parallel to both the vp and hp. Engineering graphics / computer aided engineering drawing. A straight line may have different orientations in space well be positioning this line in different ways th. When the projectors are parallel to each other and also perpendicular to the plane, the projection is called orthographic. The graphics of engineering design and construction may very. Projectors are the lines drawn from each and every point of the object. Draw the projections of the following straight lines. Rotating line method ppt engineering graphics ktu applications of projections- projection of lines explained with applications. 1 projection theory engineering and technical graphics are dependent on pro-jection methods. The engineering drawing common to all engineering trades is one of the book developed by the core group members as per the nsqf syllabus. What are projection, projector and plane of projection? Ans. Projection of straight lines and planes first angle. Hence begin with tv, draw rectangle below x-y drawing one small side vertical. Parallel projection parallel projection is a type of projection where the line of sight or projectors are parallel and are perpendicular to the.
An electric bulb hangs in the center of the ceiling and 1m below it. Department of mechanical engineering subject- engineering graphics b. Subsidiary topics like sectioning, projection of points and lines. The two projection methods primarily used are perspective and parallel. Here you can download the free engineering graphics pdf notes. When the bulb is switched on the image of the black spot falls on one of the corner of the room at a. In they may by angle of dimensions in by rupting hatchlng lines, in figure 3. These lines are perpendicular to the plane of projection. 473 If a client of yours is having difficulty visualizing a design, what type of drawing would be the easiest. 14, a line will show as a point view when projected to a. Draw the projections of a line ab inclined to both hp and vp, whose true length and true inclinations and locations of one of the end points. In most cad software, the trimetric projection fixes one side along a horizontal line and tips the cube forward as shown in figure 2. An orthographic projection describes the shape of an object.