Technical drawing is a universal language for effective communication in the manufacturing industry and is therefore an important subject in the tvet programme at the senior high school. In this view, the crosssectional shape of ribs, spokes, and other projections of the object are featured. Technical drawing, drafting or drawing, is the act and discipline of composing drawings that visually communicate how something functions or is constructed technical drawing is essential for communicating ideas in industry and engineering. If the isometric drawing can show all details and all dimensions on one drawing, it is ideal.
Full section, half section, part section, broken section, revolved section. Used to improve clarity and reveal interior features of parts. If you had to show all the detail on simple plan and profile drawings the drawings would become too large an. The purpose of dimensioning is to provide a clear and complete description of an object. What are the main reasons for sectioning in engineering. Candidates will be required to answer only one of the questions in 2 hours for 70 marks. Sectional drawings are multiview technical drawings that contain special views of a part or parts, views that reveal interior features. It is considered poor practice to dimension to a hidden line and sectional views allow us to dimension the interior of a part without dimensioning to hidden lines. Feb 09, 2019 engineering drawing iii for technical high school students of kerala state 1.
A revolving view is effective for elongated objects or the elongated section of an object. Home mechanical engineering college of science and. Apr 22, 2020 a section is used to show the detail of a component, or an assembly, on a particular plane which is known as the cutting plane. Sectional views are used in engineering and architectural drawings. A section lined area is always completely bounded by a visible outline never by a hidden line. We will focus on these types, but this knowledge is. In addition, specifications covering performance, interf8. However, it is very important that the drawing produced to be accurate and clear. Allows sectioning of features that are not in a straight line. We also have waec past question for all other subjects. Sectioning is the process of drawing an object imagining it to be cut throw by a cutting object. A cuttingplane line shows where object was cut to obtain the section view. Sections and sectional views engineering drawing joshua.
The first is a drawing done without instruments, known as a sketch. Drawings for specialized engineering disciplines e. The second is a drawing done with instruments, known as a final drawing. Waec past questions and answers on technical drawing. Sketch final drawing artistic drawings convey an idea, feeling, mood or situation. Mechanical engineering drawing concordia university. It is a language of communication between architects and engineers, usually to convey information about the object. Hidden lines should be omitted in section views unless they are necessary, as in fig. Sep 28, 2015 pieces of the inseparable assembly may be detailed either on separate detail drawings or on the inseparable assembly drawing itself. Proper dimensioning will help to manufacturers, engineers etc. One can pack a great deal of information into an isometric drawing.
Capital letters are placed at each end of the cutting plane line, for clarity or when more than one cutting plane is used on a drawing. These views assume that a cutting plane has removed portions of the object represented by the drawing, displaying the appropriate section of the interior. A common use is to specify the geometry necessary for the construction of a component and is called a detail drawing. However, the convention in a drawing is to show the view on the left as the preferred method for sectioning this type of object. Sections are used to show interior details clearly.
The open space between the lines is approximately 1. Contents notes 1 drawing materials and equipment, types of drawing and applications standard size drawing a2 iso board and drawing sheet, set squares, drawing instruments, protractor and tsquare. Engineering drawing iii for technical high school students of. Cross hatching in the section view shows the solid surface of the object which were cut through to produce the section. Read a working or assembly drawing blueprint represent mechanical components in multiview orthographic representation create conceptual design sketches create assembly drawings limited. The following slides will help show the several methods or types of section views. Dimensioning rules is very important for drawing standards. The crosssection on the right of figure 22 is technically correct. This chapter focuses on the rudimentary elements of freehand technical sketching, because in many ways freehand sketching is the first step in cad. Technical drawings represent the exact shape, dimensions and composition of an object with a view. Place the cuttingplane line to show the most detail.
It descnoes typical applications and minimum content requirements. Another method of drawing a partial view is to break out much of the. An international organization codified some of these graphic tools so that everyone could understand them. Modifying drawing types are altered item, selected item, and modification drawings. Define sectioning in technical drawing and its types answers. Sections are provided to give a clearer and more detailed drawing to show what the design is and what is required to complete the project. On this channel you can get education and knowledge for general issues and topics you can sponsor us by sign up by clicking on this link. Engineering drawing and sketching introduction one of the best ways to communicate ones ideas is through some form of picture or drawing. Keep the following things in mind when drawing sectional views.
At latest count, the department has 43 active faculty, 56 staff members, 311 graduate students, 50 postdoctoral associates, research associates and visitors. Let us take an civil engineeringarchitectural example of a house drawing. Technical drawing offers prerequisite knowledge and skills for a number of the technical and vocational areas of work. The purpose of this guide is to give you the basics of engineering sketching and drawing. All parts and details are rotated into the section view. Visible edges and contours behind the cutting plane should be shown, as below in fig. The cutting plane cuts the object at an angle, but the drawing is rotated for a better view by the observer. Figures a and b only show half views of the top view. Note that you need to have at least 5 credits in waec including mathematics and english to be able to get admission into higher institutions in nigeria. Drafters specialize in producing various types of technical drawings. This standard defines more on types of engineering drawing. What are the 15 types of technical drawingprojection. Drafting began when the early people started drawing objects on earth sand and stone 3.
Mention types of drawing explain the difference between different types of drawings mention some of the applications of technical drawings 1. Technical drawing is concerned mainly with using lines, circles, arcs etc. Selected front view should describe the part the best. Engineering drawing dimensioning and sectioning essay. Parallel projection is the type of projection in which the lines of sight or projectors are parallel to each other, and also perpendicular to the planes of objects or images. While other technical drawing programs exist in the market, most employers prefer drafters with autocad and revit training and experience. All of the various types of sectional views can be drawn with autocad. Ce 100 civil engineering drawing sessional lab manual. Sectioned technical illustrations are used to describe interior features of complicated assemblies. In technical drawing, the principles of geometry are employed constantly, but instruments are not limited to the basic two as tsquares, triangles, scales, curves. Define sectioning in technical drawing and its types. To become proficient in a technical drawing specialty, a drafter must gain years of experience. A compressed handbook designed for the students of engineering disciplines for learning the basics of engineering drawing.
What is the importance of sectioning in an engineering. Line types identification purpose in this section you will be able to recognise and interpret different line types, and the need for variation in thickness used on engineering drawings. In each case the back half of the object in the circular view is shown to expose the back portion of the object for viewing in section. Aligned sections usually used on symmetrical circular parts. A true development is one in which no stretching or distortion of the surfaces occurs and every surface of the development is the same size and shape as the corresponding surface on the 3d object. These drawing types are not used for items made from raw or bulk materials, items purchased in bulk lengths, or such semiprocessed items as blank panels, castings, electronic equipment drawers, etc. Pdf engineering drawing for beginners researchgate.
If the thing we are drawing is too complicated for this method, instead of drawing hidden. The cut line is called a cutting plane, and can be done in several ways. In reference to architectural drawing, the term section typically describes a cut through the body of a building, perpendicular to the horizon line. Ribs and spokes can be left unlined for better clarity in the section view. Drawing is a graphic representation of real thing an idea or proposed design. Sep 15, 2009 define sectioning in technical drawing and its types. Drafting accurate manual or computerized presentation of working plans and detailed drawings. An engineering drawing is a type of technical drawing that is used to convey information about an object. Assume that you had a bracket and cut it with a hacksaw along the line marked bb. In the case of weldments, the parts shall not be individually detailed on separate drawings. A section drawing is one that shows a vertical cut transecting, typically. Jan 22, 2019 sectional views reveal hidden details in a mechanical drawing.
Drawing section views middlesex county vocational and. A section view is a view used on a drawing to show an area or hidden part of an object by cutting away or removing some of that object. By analyzing different aspects of 1996 technical drawings included in the fyp about different scopes, it is hoped to be. If the thing we are drawing is quite simple, we can mark the hidden parts by a hidden outline. Drawing just like photography is one of the basic forms of visual communication. Dec 18, 2016 download or view onlinewaec past questions and answers on technical drawing. Sectioning standards and conventions recognition an engineering drawing often needs to show features that we cant see because they are inside the object. The student completed task within the time limited. Welcome to the department of mechanical engineering, part of the college of science and engineering, serving the state and nation as a leading center of education, research, and innovation. Technical drawing dimensioning types cobanengineering. For such items, use detail or detail assembly drawings.
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