The picture planes used for obtaining the orthographic projections are called the principal planes of projection or reference planes or co ordinate planes of projection. Engineering graphics 1st yr projection of points and lines. Other parties may have an interest in design collaboration, procurement purchasing, costing, manufacturing, quality control, marketing, handling packaging. A point r is 25 mm above hp and 20 mm infront of vp. If any imaginary transparent plane is introduced such that the object is in between the observer and the plane. If you continue browsing the site, you agree to the use of cookies on this website. Nov 03, 2014 engineering graphics projection of points, projection of lines slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. Engineering drawing lecture 6 16082011 projection of points and 1 projection of lines indian institute of technology guwahati guwahati 781039. An engineering drawing is a technical not artistic drawing which.
Computer aided engineering drawing girish hanumaiah p 3 of 28 31. Pdf a textbook of engineering drawing a textbook of. An engineering detail drawing contains the key points to enable the manufacture or description of a single component that defines and communicates part of a complete design to other interested parties. Engineering graphics projection of points and lines. The purpose of this guide is to give you the basics of engineering sketching and drawing. A tolerance value shows the manufacturing department the maximum permissible variation from the dimension. A compressed handbook designed for the students of engineering disciplines for learning the basics of engineering drawing. Drawing scales scale is the ratio of the linear dimension of an element of an object shown in the drawing to the real linear dimension of the same element of the object.
On engineering drawing, we have come a long way from the days of leonardo da vinci, the italian polymath who had compiled drawings on a large variety of inventions. Let q be another point, which we must assume is not. Appreciate the efforts to understand better of the drawing. Click on the link below to download the book click here download free. The second method dimensions the circle internally. While the interpretation of a component in terms of sketching can be done in various methods, related to descriptive geometry, the three most necessary techniques of drawing projection are. Thus, every drawing of an object will have four things on which projection depends. A common use is to specify the geometry necessary for the construction of a component and is called a detail drawing. The relation between the dimension on the drawing and the actual dimension of the object is mentioned numerically like 10 mm 15 m. Pdf this book has been designed to cater the needs of the firstyear engineering students of all branches. The form is unreal in that we don not see an object as it is drawn orthographically.
Engineering drawing projections of points,lines,planes and. An engineering drawing is a type of technical drawing that is used to convey information about an object. The gsfc engineering drawing standards manual is the official source for the requirements and interpretations to be used in the development and presentation of engineering drawings and related documentation for the gsfc. Orthographic projection of points, lines, planes and solids. Engineering graphics computer aided engineering 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. For obtaining the image of an object, various points on the contour of an object, are thrown forward on to a plane by means of straight lines or visual rays. Mechanical engineering drawing concordia university. Ioe engineering drawing solution i and ii ioe notes. Find the distance between top views of points r and s.
The plane in front of observer is the vertical plane. Each dimension on a drawing must include a tolerance value. The ebooks,syllabus,text books and other technical refferences are collected for the use of the students. Engineering drawing, also called technical drawing and engineering graphics, is the. Projection of points orthographic p a point define its position with respect to the coordinates. Drawing just like photography is one of the basic forms of visual communication. The mechanical engineering branch, mechanical systems division, has been delegated. The accuracy depends largely on the manufacturing process. Orthographic projections indian institute of technology.
Orthographic projection is the standard drawing form of the industrial world. Engineering drawing and sketching introduction one of the best ways to communicate ones ideas is through some form of picture or drawing. Engineering drawing, is the most important aspect of mechanical engineering, as it is the fundamental need to develop the design and assembly of a machine. This will get you used to the look and feel of an engineering drawing.
Engineering drawing lettering and lines presentation 1. Engineering drawings the blank engineering drawing form this blank template can be printed off the 2. Isometric view orthographic projection engineering drawing. This can be accomplished by representing all three dimensions of an object in a single image or by presenting a collection. The distance between their projectors measured parallel to the line of intersection vp and hp is 50 mm. Give us feedback about the improvement of the site, so that we can. Drawing is used to record objects and actions of everyday life in an easily recognizable manner. Engineering graphics projection of points, projection of lines slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. In engineering drawing following four methods of projection are commonly used, these are.
An engineering drawing, a type of technical drawing, is used to fully and clearly. Computer aided engineering drawing projection of points. You can use this form to make your own production drawings for class. Lines on an engineering drawing signify more than just the geometry of the object and it is. A 3d projection or graphical projection maps points in threedimensions onto a twodimensional plane. Interpretation of mechanical engineering drawings for paper. Today, an engineering drawing extensively includes the practice of orthographic projection and isometric view isometric projection. While drawing this true shape keep one sideedge which is making inclination perpendicular to xy line similar to pair no. List the procedure for changing text, arrow and line sizes in autocad. The figure formed by joining various points thus obtained on the plane, is the image of the object and is called projection. Different views of an object can be drawn by projections.
Sep 15, 2015 engineering drawings specify requirements of a component or assembly which can be complicated. Orthographic projections orthographic projections is a technical drawing in which different views of an object are projected on different reference planes observing perpendicular to respective reference plane. You will be glad to know that right now engineering drawing by k r gopalakrishna pdf is available on our online library. When a point lies in the second quadrant, it will be in front of vp. Pictorial drawing however has photographic realism. Engineering drawing is compulsory course for all faculties of engineering and the objective of this course is to help student develop basic projection concepts with reference to points, lines, planes and geometrical solids. In order for the system to be really useful, we have stressed the recognition of these higherlevel entities, by matching a set of configurations stored in a library of ob jects with the drawing being processed.
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