Contour lines contour lines describe the shape of an object, and include interior detail. What are the types of lines in engineering drawing. The lines and symbols used in the alphabet of lines are universal, which means engineers around the world use and understand them. The alphabet of lines is a list of line symbols that engineers use in technical drawings to communicate specific shapes, sizes or surfaces. Each type of line has a very precise symbolic meaning. Fold lines and extension lines are drawn very lightly, when used, and are not part of the finished drawing. Basic mechanical engineering drawing linkedin slideshare. Encourage the children to go over the dotted lines and trace the boundary. The british technical drawing standards give us four different types of terminators to use with our leader lines. Often the drawing of anything signifies a lot of things for the subject.
For example, a contour drawing of a persons face would include a line defining the shape of the head and additional lines that describe the surfaces and planes of the facial features. 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. Answer in drafting, or computer aided drafting cad the alphabet of lines are the different lines that draftsmen, architects, engineers, et al use when constructing a drawing. Drawing is the art or technique of representing an object or outlining. Since, they arent able to draw types of engineering drawing on their own, hence they seek exp.
Objectives at the end of this section you should be able to. The adobe portable document format pdf is a compressed electronic document format that can be viewed on multiple platforms. Collection of different lines which vary in line weight and type. Its purpose is to provide a consistent guide for those using engineering drawings. Hello friends, in this video we are going to discuss about the types of lines and its apications which are the basics of the engineering graphics. Correct usage of this alphabet of lines is essential whether you use traditional drafting methods or cad. Orthographic projection of points, lines, planes and solids. When students take engineering as a subject, one needs to do a lot of drawing. The alphabet of lines in technical drawing lines in technical drawings are part of a specialized graphic language that is standardized throughout industry. Other languages may fail to describe the size, shape, physical aspects, inner details, finish, etc. A technical drawing is a means of clearly and concisely. Drawing is a form of visual art in which a person uses various. Alphabet of lines lines are the critical component of sketching lines have different types, thickness and shape has its own meaning alphabet of lines are also known as line symbols 3. In this highly interactive object, learners associate basic line types and terms with engineering drawing geometry.
When the single letters have been exhausted, the revisions. Used in perspectives for determining the direction of the depth lines symbol chamfers vanishing point octagon 2. However, it is very important that the drawing produced to be accurate and clear. Developed by the american society of mechanical engineers asme. Compare between methods of entering coordinate system. It does not require an understanding of its creator, only an understanding of technical drawings. In art, lines may be the path made by a pencil or the. Mechanical drafting 5 k to 12 technology and livelihood education assembly drawing a drawing that shows how different parts go together compass an instrument used when drawing arcs and circles delivery receipt a form that shows proof or receipt of goods or services detailed drawing a drawing showing a single part of a machine. Commands that create pdf files there are many commands and methods you can use to produce pdf files. This will require learning some new concepts and skills as well as learning a different vocabulary. They should not be visible when viewing beyond an arms length from the drawing. The american society of mechanical engineers asme publishes geometric dimensioning and tolerancing y14. Identifying revisions on drawings revision letters. There is 4 letters in the alphabet that have parallel lines.
If you continue browsing the site, you agree to the use of cookies on this website. Key to successful drafting is to have a good technical knowledge of these various line characteristics to understand where and when to apply them in technical drawing. But in a concrete example of the use of various types in technical line drawings is still in secondary scripts on this site received. Basic types of lines used in engineering drawings wisc. This contour drawing gives an indication of general physical features. Letters, numerals and lines upper case letters should be used except for conventional refs.
When complete part numbers drawing number plus the dash number are shown in the picture sheet, the blueprint reader will need to refer to the respective drawing number to view the detailed part. In drawing lines are with dark it is representing the actual image of drawing. A leader line may have a reference line under the text. Object or visible lines thick dark line use to show outline of object, visible edges and surfaces. Dwg 001 blueprint reading line standards drawing symbols. Feb 05, 2010 alphabet of lines slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. If you are a beginner in technical drawing, you will see the stichpunktartigen information on the cases of application of different line types is not very anschlaulich be. It gives accepted callouts and practices to dimension features on a drawing.
The fundamentals of design drafting a students guide. Continuous thick lines are used to indicate visible outlines. Alphabet of lines introduction o lines and line symbols used on drawings o drawings are easier to read o good contrast among different line symbols o generally two line widths. Fundamentals of technical drawing technical drawing. Different lines represent different aspects of a drawing. Alphabet of lines line types and conventions for mechanical drawings are covered in ansi standard y14. It is a language of communication between architects and engineers, usually to convey information about the object. Test your basic knowledge of certified drafting exam. Lines that are not parallel to these axes will not be of their true length. Engineering drawing different types of lines and their uses.
If the isometric drawing can show all details and all dimensions on one drawing, it is ideal. Introduction to different lines with different examples 4. Use traditional tools and cad to erase parts of a drawing. The letters a,x, and t are examples of intersecting lines. Examples in this gallery include the symbols for cast iron, wood, brass, copper, glass, and more. The lines are commonly used in drawing with specified reason and lines are different types. Use these guidelines to select the most appropriate method. Types of lines basics of engineering graphics engineering. Pdf files are widely used to transmit drawing data over the internet. Technical drawing lines are used for different purposes to provide specific information for designers, manufacturers, etc.
Alphabet of lines are lines needed to cover the lines with labeling symbols within the diagram. Slide set 1 alphabet of lines and precedence of lines. The leader line itself should be a continuous thin line see this post on linetype definitions. Oct 21, 2016 tle 9 technical drafting alphabet of lines 1. I guess like any type of technical drawing you need to have an understanding of what device youre trying to illustrate, its functions, and the space creators need to understand while assembling. Fundamentals of mechanical drafting 103 there are two kinds of oblique drawings. Download it once and read it on your kindle device, pc, phones or tablets. Line types are also a language type to communicate between technical people. Engineering drawing different types of lines and their. Notice that the projectors or extension lines, are perpendicular to the folding lines of the glass box. Find technical drawing lesson plans and teaching resources. This video will help you to understand the difference between different types of lines used in technical drawing. The person who will read drawings have to learn what they mean. Centerlines become extension lines when used to show the extend of a dimension.
The fundamentals of design drafting resources are flexible and instructors should feel comfortable supplementing curriculum resources that they have found successful throughout the years. Engineering drawing and workshop drawing engineering drawing is a language which is understood throughout the world by engineers and fabricators. Alphabet of lines the lines used in drafting are often referred to as the. The alphabet of lines is used to make a drawing neater and clearer to understand. Jan 21, 2018 hello friends, in this video we are going to discuss about the types of lines and its apications which are the basics of the engineering graphics. The mechanical drawing conventions clipart gallery offers 48 illustrations of the conventions used to represent different materials in mechanical drawing. All parts, except the view label, are called out with the use of leader. Identify standard pencil grades, and identify those most commonly used for technical drawings. Scan the sketch using a scanner to make a bitmap, raster or pdf file. We welcome your suggestions, and hope that you will become part of the collaborative effort in educating our future engineers and architects. Upper case letters shall be used in sequence beginning with a and omitting letters i, o, q, s, x, and z. To suggest that something is light or delicate, the line can become thinner and lighter in color, using a pointed tip or pressing gently on the surface of the paper. Aug 30, 2017 contour lines can suggest weight by pressing down harder or using the wider edge of a drawing instrument to create a thicker, denser line. All parts, except the view label, are called out with the use of leader lines that point to the edge of the part they are associated with.
Artistic drawingsdrawings used to express philosophic or aesthetic. Today, the majority of the mechanical cad systems are capable of creating threedimensional solid models. Technical drawings lines,geometric dimensioning and. Technical drawing is concerned mainly with using lines, circles, arcs etc. Alphabet of lines circumference center point base environment 3. Acavalier drawing and a cabinet drawing are drawn in the same manner, except that a cavalier drawing is always made to the exact measurements of the object.
Every line is drawn at different thickness and darkness to express contrast as well as importance. For example, 1 100 is a typical scale used for civil engineering drawings. Drawn very light so they will not reproduce when making a blue print. Identify the types and thicknesses of the various lines in the alphabet of lines. Let us create a mechanical drawing or model for you. Can cross object lines, hidden lines, and centerlines, but should not cross dimension lines. Introduction to different lines with different examples 5. Basic types of lines used in engineering drawings by kelly curran glenn sokolowski. The american society of mechanical engineers asme has developed this. In engineering drawing required lines are should be maintain maximum thickness. What is different between drawing and drafting answers. Engineering drawings lecture letters numerals and lines. It is the accepted industry authority for dimensioning practice.
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