MECHANICAL ENGINEERING 22 Leader. • All dimension lines terminate with an . Where a change in direction of the cutting plane is not clear, reference letters may also be placed at each change of direction. However, the break tells you that a considerable amount of the central part of the figure is presumed to be removed. Required fields are marked *. The use of a right type of line results in a correct drawing. Certain features on a Engineering Drawing requires specific ways of indication. Section view of Object & convention as Indian standards all images tell me, how can i draw different polygons of different angles, Your email address will not be published. A 4H to 6H pencil with a sharp, conical point should be used. Lineweight - Used to describe the strength of a line, or how light or dark it appears on paper. Fig. In other words, indicating on a drawing, the sizes of the object and the other details essential for its construction and function using lines, numerals, symbols, notes, etc., is called dimensioning. The ISO type 'C' lines are thin, wavy and continuous, as shown in Figure 3.7. A section view is obtained by cutting away part of an object to show the shape and construction at the cutting plane. The surface of the imaginary cut is crosshatched with lines called section lines. Line characteristics, such as widths, breaks in the line, and zigzags, all have definite meanings. %%EOF Used as a guide for lettering, very light type of construction line. From any suitable  portion of the reference, note, or number, a short line is drawn parallel to the lettering. To make sure everyone interprets drawings the same way, the use of each type and thickness of lines is defined in Australian Standard 1100 Drawing Practice. Types of Lines in Art Drawing ... Mass gesture lines refer specifically to using a drawing instrument on its widest side. These lines touch the outline of the part. MECHANICAL ENGINEERING 22 3-27 Correct and Incorrect Procedures for Drawing Adjoining Hidden Lines, Extension lines are used to extend dimensions beyond the outline of a view so that they can be read easily. They should extend at least one-fourth in. Heaviest line type encloses the drawing. CUTTING PLANE LINES are used to indicate a plane or planes in which a sectional view  is taken. Most CAD Software packages will have these different line types predefined as layers. Section views are used to give a clearer view of the interior or hidden feature of an object that normally cannot be clearly observed in conventional outside views. Line weight for construction lines is not important since they will not appear on your finished drawing. 2. The basis of any drawing is a line. I have amalgamated the definitions from the engineering drawing supplement and the construction drawing supplement together. Drafting students or those reading the drawings have to learn what they mean, just as one learns a new language. If the reference is to a line, the leader is always terminated at this line with an arrowhead, as shown in figure 3-33. Since technical drawings are made of lines, it is logical that the first step in learning to “read” a drawing is to learn the meaning of each kind of line. A dimension line which is a type B line (thin, continuous and straight). Types of lines include the following: These lines are omitted by general custom, the custom being based on the fact that the elimination of hidden lines is the basic reason for making a sectional view. The letters that are part of the cutting plane indication should always appear as part of the title; for example, SECTION A-A, SECTION B-B, If the single alphabet is exhausted, multiples of letters maybe used. • If possible, dimension lines are aligned and grouped for uniform appearance. The cutting plane may be a single continuous plane, or it may be offset if the detail can be shown to better advantage. are represented with specifications like size, shape, materials etc. (See fig. The standard views used in a three-view drawing are the top, front and the right side views Stitch lines are used to indicate the stitching or sewing lines on an article. Basic Types of Lines Used in Engineering Drawings By Kelly Curran Glenn Sokolowski. It includes projection line, leader line, termination of the dimension line, … All the best Types Of Dimensioning In Engineering Drawing 30+ collected on this page. In this highly interactive object, learners associate basic line types and terms with engineering drawing geometry. For example, holes require center lines to identify the center and show that it is round. On adjacent parts, the lines shall be drawn in opposite directions. Technical drawings provide clear and accurate information how an object is to be manufactured. Occasionally, when the radius of an arc is to be indicated, there is an arrow at only the end of the line that touches the arc. They are type B lines (thin, continuous and straight). On simple views, the cutting plane should be indicated as shown in figure 3-38, view A. For example, holes require center lines to identify the center and show that it is round. Types of Lines. Center lines are used to indicate the center of a circle, arc, or any symmetrical object. on mechanical engineering drawings; a slash, or a dot in architecture. Powered by WordPress. NPTEL provides E-learning through online Web and Video courses various streams. Orthogonal Line - Used in perspective drawing, orthogonal are the lines that reach back to and converge at the vanishing point. Dimension lines present certain measurements of and between items in a drawing. The arrows at the end of the cutting plane lines are used to indicate the direction in which the sections are viewed. The basis of any drawing is a line. Section Line… I guess like any type of technical drawing you need to have an understanding of what device you’re trying to illustrate, its functions, and the space creators need to understand while assembling. A section like the one shown in figure 3-37, which goes all the way through and divides the object into halves, is called a full section. A quiz completes the activity. The use of a right type of line results in a correct drawing. endstream endobj 997 0 obj <>/Metadata 114 0 R/OCProperties<>/OCGs[1008 0 R]>>/Outlines 144 0 R/PageLayout/SinglePage/Pages 989 0 R/StructTreeRoot 201 0 R/Type/Catalog>> endobj 998 0 obj <>/ExtGState<>/Font<>/Properties<>/XObject<>>>/Rotate 0/StructParents 0/Type/Page>> endobj 999 0 obj <>stream They consist of a series of very short dashes (medium thickness), approximately half the length of the dash of hidden lines, evenly spaced. 3-24.). Typical Window Types … .1 Conventional Lines and Their Usage (Contd Then draw the sides of the arrowhead as indicated at B and C. Finally, fill in the area enclosed by the lines, as shown at D. Leaders are used to connect numbers, references, or notes to the appropriate surfaces or lines on the drawing. Line characteristics, such as widths, breaks in the line, and zigzags, all have definite meanings. Architecture Symbols Different Types Of Lines Math Formulas Broken Heart Quotes Electrical Engineering Design Process Nitish Kumar Durga Visual Arts. Table 1 shows the types and thickness of lines … An engineering drawing is a type of drawing that is technical in nature, used to fully and clearly define requirements for engineered items, and is usually created in accordance with standardized conventions for layout, nomenclature, interpretation, appearance (such as typefaces and line styles), size, etc. Following are the two types of oblique projection according to construction. In Figure. Applications Of Lines On PPT. Your email address will not be published. They will also be used to lay out the rest of your drawing. Each type is defined by general description, application guide­ lines, and specific content requirements. Types of projections 1. The single view in figure 3-38, view B, helps you to visualize the cutting plane. A line can be a straight or a curve, they must have a specific starting point and an endpoint, and may be with or without interruption through his. long. Now we are going discus one of the important part of C ivil Engineering drawing. The arrows point in the direction in which you are to look at the sectional view. Broken lines .

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