Under the top view front view always comes. The figure formed by the projection of all the visible and invisible faces of both the interior and exterior of an object is called a “view” in engineering drawings. The finish on a metal surface after machining depends mainly on the material and some are as follows. 4-3 Fundamentals of Orthographic Views. In the projection method, all the faces of a solid, both visible and invisible, are thrown forward onto a plane. Between the observer and object plane of projection lies. DRG. Note that in the projected right plane there are three rectangles. Instead of a single three-dimensional view it uses different two-dimensional views of the object. The views are two-dimensional, so they show no depth. Basic of Orthographic Projection Basic of Orthographic Projection & Orthographic Projection Examples What is Orthographic? On the right plane left view is projected. By looking to the object from the left side or right side this view is prepared and in this view breadth and height of an object is shown. Please hand this into the teacher. For example, an orthographic projection of a house typically The word ‘projection’ is of Latin meaning “to throw forward”. ... BY FIRST ANGLE PROJECTION METHOD Example-3. Since the visual rays, called projectors, are perpendicular, i.e., orthogonal to the plane of projection the view is called orthographic view and the projection method is called orthographic projection. Geometrical figures are in two dimensions, hence they may be drawn to their actual sizes and shapes on a sheet of paper as it is also in two dimensions. 45 152 152 64 25~4 0 Front Top Choose a drawing scale (say 1:1) Front Top y x x x x y y z. To the right of the front view left side view always comes. Dimension an Orthographic Drawing Design and Drafting – 2D Drawing 2 Youth Explore Trades Skills Scale: a command used to proportionally resize objects; the multiplying factor by which you make an object larger or smaller. It is necessary to show only enough views to show all the features. The view projected on them namely, front top and profile views are called principle views. Drawings of objects for using in Engg practice, have to be in their true shapes and sizes. Surface Finish and Surface Roughness Snap: limits the movement of the cursor crosshairs to a predetermined interval in order to aid in drawing to specific measurements. In this way four right angles are obtained and called dihedral angle and to take orthographic projection the object is placed in any of these right angles. Rough estimations to scale will do. By the meeting of two surfaces projection line always forms. Hence, they can not be used in engineering practice for construction work. ORTHOGRAPHIC PROJECTION EXERCISE 1 ORTHOGRAPHIC PROJECTION Exercises mod - 9 - EXERCISES. Orthographic projection is a means of representing a three-dimensional object in two dimensions. Instead of a single three-dimensional view it uses different two-dimensional views of the object in Orthographic projection. Orthographic projection drawing consists of three different views front view, top view and side view and for clarity more views are used and usually, the view is the right side. To the observer the view is always in the opposite direction. What do you do? dimensions and notes. Orthographic projection also called orthogonal projection is a means of representing three-dimensional objects in two dimensions. However, solids may be represented on a paper pictorially in its three-dimensional form, but of course not in its true shape and sizes. The orthographic view shown in the figure is obtained by viewing the object from the front, hence called “front view”. FOR T.V. This plane is held normal to the direction of sight of the observer who is viewing the object in the manner similar to that of a motion picture projection, where an image of a film is projected on a screen. The front view alone cannot describe the shape and sizes of the object completely as it only shows two dimensions, viz, height and width. Look around the classroom and find as complex a shape as you think possible to draw by orthographic drawing. On the left plane left view is projected. Orthographic drawings are the projection of views on a drawing. Saif M. is a Mechanical Engineer by profession. The view from the above, called top view, is drawn which enables the projection of the depth dimension along with width dimension. These projections in either a first or third angle projection are working drawings. The length and breadth of an object is shown by the top view. Orthographic Projection is a method of drawing a 2d and 3D object from different view directions. Projection lines do not touch the object and are drawn perpendicular to the element you are dimensioning. It uses multiple views of an object, from points of view rotated about the objects centre through increments of 90 degrees. These points of intersection when joint form the view of the object on the plane of the project. Even though an orthographic drawing and an isometric drawing are very correlated, there are a few major differences between them. To project the side views either left or right side plane is setup.

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