Sectional views in engineering technical drawings . Line types used in technical drawing are used for different purposes to provide specific information to the people looking at the drawing. Which of the following is not a characteristic of hardwood? SECTION LINES SYMBOLS The section lines are different for each of material’s type. You can define the view cutting line while Section View is active or create sketch geometry to use for the view cutting line. The diagonal lines on the section drawing are used to indicate the area that has been theoretically cut. For general engineering drawings, the types of lines recommended by the Bureau of Indian Standards shown in table 2 must be used. Kindly share this article via the links below: Alfred Ajibola is a Medical Biochemist, a passionate Academician with over 7 years of experience, a Versatile Writer, a Web Developer, a Cisco Certified Network Associate and a Cisco CyberOps Associate. Line types are also a language type to communicate between technical people. General principles of presentation. For the term section lines may also exist other definitions and meanings, the meaning and definition indicated above are indicative not be used for medical and legal or special purposes. Source :, Web site link of source to visit :, Author : not indicated on the source document of the above text. In Technical Drawings, Lines are used for the interpretation of drawings by the technical people involved. Objectives At the end of this section you should be able to: D Identif~"liilre types used on engineering drawings… Technical drawing has existed since ancient times. D. Hardwood and Softwood are types of wood, E. It constitutes the stems and branches of trees. Alfred Ajibola | Powered by, PLEASE SUPPORT THIS EDUCATIONAL VISION BY BECOMING A PATRON:   +2348038093033 | Place Your Adverts. Most are electrical insulators (cannot conduct electricity) but; graphite is an electrical conductor. Below are the uses of Continuous Thin Straight Zigzag Line: These lines are drawn only with the hands and without a ruler or another similar ruling material. A section drawing is one that shows a vertical cut transecting, typically along a primary axis, an object or building. In technical drawing a section view is often used to reveal some or all of an object's internal features. How to use section line in a sentence. Surrounding the sides that matter in technical drawings. A. The first step in creating a section is to draw a section line through the building model. These are Audi, Bentley, Bugatti, Ducati, Lamborghini and Porsche. Technical drawing Lines are used for different purposes to provide specific information for designers, manufacturers, etc. In Technical Drawings, Lines are used for the interpretation of drawings by the technical people involved. A 'section drawing', 'section' or 'sectional drawing' shows a view of a structure as though it had been sliced in half or cut along another imaginary plane. The term "extension line" is often used interchangeably with "dimension line"; however, they are two distinct tools when dealing with technical drawing. Make sure you understand the use of the cutting plane line to show the section. Please read on Lines in Mathematics here. According to the velocity comparison between three different surge line diameters of typical section lines at the vertical center cross-section (x=0) of the pressurizer (Figure 11), it can be seen that the trend of different diameters is basically consistent, the middle is high, and two sides are low. A. Note: The Free Hand Line is similar in function to the Continuous Thin Irregular Line. 9. The following are Types of Line in Technical Drawing EXCEPT _____. Technical drawing is a form of design communication based on line symbols recognized and understood worldwide. In United States copyright law, fair use is a doctrine that permits limited use of copyrighted material without acquiring permission from the rights holders. The information of medicine and health contained in the site are of a general nature and purpose which is purely informative and for this reason may not replace in any case, the council of a doctor or a qualified entity legally to the profession. Section lines are bidirectional and you can specify the length and depth of the section line either visually, using the pointing device, or by entering numeric values. In the engineering drawing lines are understood only by draftsmen and manufactures as well as drawing experts. Extension lines, on the other hand, are seen simply as extensions of these items. The lines in the figure above, which look like saw marks, are called section lining. Please kindly recommend to your school, Please click here to kindly support education. 53. They may then be decorated with a waterproof, paint-like substances called glazes. All the information in our site are given for nonprofit educational purposes. In reference to architectural drawing, the term section typically describes a cut through the body of a building, perpendicular to the horizon line. CUTTING PLANE LINE Extra thick line use to show cutaway views or plane of projection where a section view is taken. Used for representing projection lines, C. Used for representing visible outline and edges, Diagonal lines used to state plane surfaces. They are used for representing long break lines. Their stem are divided into trunks called dendritic form, C. Birch, Teak and Alder are examples of hardwood, D. They always have a higher density than softwood of the same mass, E. They are suitable for making deckings in buildings, F. Most hardwood are expensive than softwood. All of the red "bent arrow" lines with notes are the leaders. In engineering drawing, cross-hatching is the equivalent of painting something red. Sometimes the technical information conveyed by a drawing can best be shown by a view thatrepresents the object as it would look if part of it were cut away. Sectional views in engineering technical drawings . 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. It provides for the legal, unlicensed citation or incorporation of copyrighted material in another author's work under a four-factor balancing test. The following slides will help show the several methods or types of “section … Below are the uses of Dashed Thin Lines with Dots: This line is similar to the Dash Thin Lines with Dots EXCEPT that it has double dots within it. Half C. Quarter D. none of the above. A view of this kind is called a section. We have various type of lines in technical drawings and geometric constructions. Section :3: 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. It could be straight or curved, but with no dot or dashes within it. This Mechanical Drawing Tutorial presents a sectional view showing inner details by an imaginary cutting away of part of the object. Meaning and definition of section lines: Thin lines used in a section view to indicate where the cutting plane line has cut through material. BS 8888:2008 Technical product specification. The section view drawing in which one fourth of an object has been marked for removal is known as a _____ section. The Line weights should be in the ratio 4:2:1. Which of the following is not a function of thin continuous line in Technical drawing? 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. If you are the author of the text above and you not agree to share your knowledge for teaching, research, scholarship (for fair use as indicated in the United States copyrigh low) please send us an e-mail and we will remove your text quickly. True False: The pattern used for hatching a section can be something other than diagonal lines. A Thin Continuous Line is used for representing the followings: It has a stronger outline than the thin continuous line. The British Technical Drawing standards allows for three Line weights on each drawing. Ceramics are generally made by taking clay from the ground and mixing it with water. Section Lines. Ceramics may have constrasting physical and chemical properties (or characteristics); but in general. 3. Twitter Profile. Please Register here or Login here to contribute to this topic by commenting in the box below. CONTRIBUTE TO THIS TOPIC | ASK A QUESTION, Johann Wolfgang Dobereiner was credited with the invention of lighter in 1826 while the actual match was made 3 years later, Volkswagen group of companies own some of the top cars of the world. A half-section is a view of an object showing one-half of the view in section, as in figure 19 and 20. It is not hand written. Characteristics of Ceramics, You can attempt LEN ACADEMY Basic Technology Questions for JSS2, 2nd Term here, You can check out some Interesting Facts for Students here, A. Representing hidden details and edges on an object. The following chart shows technical drawing lines that describe a piece of machinery with a swinging arm. CUTTING PLANE Cutting plane is a plane that imaginarily cuts the object to reveal the internal features. You can also edit the depth of an existing Section View, and include or exclude a Slice operation in the view. Also, it may be added here, that Lettering is appropriate and correct… They serve as axis lines of symmetrical drawings. If the arrows pointed down instead of up then you would be looking at the passenger's half of the (American) car. The followings are characteristics of ceramics except _____. L. The person who will read drawings have to learn what they mean. History. True False: The Cutting Plane line reveals the type of material that the object is to be made from. Each of these lines will serve a different purpose by providing a specific detail or information to those looking at your construction or drawing. The Different types of lines are involved engineering drawing according to the drawing standards and for understanding.. D rawing lines are showing their preferences in the drawing. Basic conventions for lines. However, this varies for each drawing discipline. Thin lines used in a section view to indicate where the cutting plane line has cut through material. It is used to show the internal details of parts which otherwise would become too complex to show or dimension. In offset sections, offsets or bends in the cutting plane are all: A. INTRODUCTION Lettering is an important part of engineering drawing. The diagram below shows the various types of line, their description and general application: 1. As a student, an understanding of the various type of lines will prove generally useful, especially to those with great interest in Mathematics and Basic Technology. Sections help in reducing or eliminating the hidden lines. The following texts are the property of their respective authors and we thank them for giving us the opportunity to share for free to students, teachers and users of the Web their texts will used only for illustrative educational and scientific purposes only. The diagram below shows the various types of line, their description and general application: A thin continuous line could be a straight or curved line but the main point is that it’s a tiny (thin) line with no dot or dashes within it. The outermost covering of a wood is called the _____. BS EN ISO 128-20:2001 Technical drawings. The following texts are the property of their respective authors and we thank them for giving us the opportunity to share for free to students, teachers and users of the Web their texts will used only for illustrative educational and scientific purposes only. Designed by The following statements are true concerning wood except _____. Being refractory means that they are capable of withstanding a variety of abuses like high temperatures and chemical attacks. They are used for limits of interrupted sections if the limit is not an axis. The generated section view that is created may form partof the same view as the reference view, permitted the correct projection method(first or third angled projection) is used. Engineering drawings only require two line weights, Construction drawings can have up to four Line weights.. Section line definition is - the boundary line of a section in surveying or land distribution. C. Poly line D. Dimension line. C. Ceramics can be absolutely defined by its products characteristics, D. Ceramic materials are not organic in nature, F. Ceramics materials are usually made from clay. It shows and describes clearly and accurately the information required to build or manufacture a product. It gives information regarding size, and instructions, in the form of notes and dimension. The cross-hatch lines are usually equi-spaced and, for small parts, cover the whole of the 'red' cut area. They are lines with pointed edges at one or both ends. Copyright © document.write(new Date().getFullYear());, All rights reserved. Note the arrows on the section view - the dashed line shows the person viewing the drawing where the object was cut, and then the arrows show which half you're going to look at. looking at the drawing. Hidden lines are having depth explanation behind according to the drawing system.. They are used for limits of partial views if the limit is not an axis. LinkedIn Profile Continuous Thin lines are used for the Dimensions line, Leader lines, Fictitious line, Hatching lines (Hatching lines when drafting of model drawing to show as a sectioning ) and also for the Imaginary intersection of surfaces, Revolved sections, Adjacent parts, Tangent bend lines and fold, When representing the circular section then thin lines are in center of the part. BS ISO 128-23:1999 Technical drawings. Notice that the square hole in the object has no section lining, since it was not changed by sectioning. PAPER 1: will consist of forty multiple-choice objective questions all of which are to be answered in 1 hour for 40 marks. Drafting students or those reading the drawings have to learn what they mean, just as one learns a new language. They can be very hard with great strength; although a few are brittle or soft; for example, graphite. They are found on most sectional views, and indicate the surface which has been exposed by the cutting plane. Which of the following statement is false of ceramics? Complex technical drawings were made in renaissance times, such as the drawings of Leonardo da Vinci.Modern engineering drawing, with its precise conventions of orthographic projection and scale, arose in France at a time when the Industrial Revolution was in its infancy. D. Most are insulators but graphite is a conductor of electricity, F. They have great tensile strength but graphite is soft. Technical drawings provide clear and accurate information how an object is to be manufactured. Should the draftsman choose not touse this method, a separate view will be created and a identification headingneeds to be assigned to it. 8.1 and it is required to draw three sectional views.Assume that you had a bracket and cut it with a hacksaw along the line marked B-B. 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.To make the drawings easier to understand, people use familiar symbols, perspectives, units of measurement, notation systems, visual styles, and page layout. The paper will consist of two sections, Sections Once again, you are free to make up your own line definitions, but it is recommended that you put a note on the drawing with their meaning. The section line defines the extents of the section to extract from the building model. Thick Continuous Line is mainly used for: These lines contain short tiny (thin) dashes within it. Glossary of technical drawing terms . The thickness of the lines must be chosen according to the type and size of the drawing from any of the six groups given in Table 1. This is a straight line in the zigzag direction. It is then shaped into any form and fired inside an oven (called kiln) at a very high temperature. Cutting plane Cutting plane line Section lines 4. Examples of fair use include commentary, search engines, criticism, news reporting, research, teaching, library archiving and scholarship.

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