ME111: Engineering Drawing ... A line of 1 meter length is shown by 1 cm on the drawing sheet. 5. Conventional Practices for Orthographic and Sectional Views (Full and Half Section) 2. Methods for converting toleranced dimensions to SI are presented. NPTEL provides E-learning through online Web and Video courses various streams. Elementary Engineering Drawing by N.D.Bhatt Charotar Publishing.Importance of Engineering Drawing, Scales: Representative Fraction, Type of. Q38 – What are the main uses of scale? Depending on R.F, scales can be divided into three categories: 6. Conventional Practices for Orthographic and Sectional Views (Other Type Sections) 3. here the ratio called representative factor is more than unity. Here such a scale means that one unit of measurment on the map is equal to 50000 of the same unit on the ground. Representative fraction The ratio of the dimension of the element in the drawing to the dimension of the same element in the object is called the representative fraction. R.F. )a = length of drawing in cm actual length in cm area of drawing in cm² actual area in cm² = v = volume as per drwg in cm³. length to be measured in cm. representative fraction (r.f. R.F=(Drawing dimension / actual dimension) Classification of scales depending on R.F. Representative Fraction (RF) - Fractional Scale - Ratio Scale: 1:50000 represents the map scale as a mathematical ratio or fraction, thus the name ratio scale or fractional scale. ME 111: Engineering Drawing Lecture 3 05-08-2011 SCALES AND Engineering Curves Indian Institute of Technology Guwahati Guwahati – 781039. Rationale: Engineering Drawing is an effective language of engineers. Q37 – What is the representative fraction (R.F.) Content : 1. The primary problem faced in learning and teaching of engineering drawing is the limited availability of text books that focus on the basic rules and The length and width of the field, on the map is 10 When a 1 cm long line in a drawing represents 1 or scale factor (S.F.)? The full form of R.F is representative fraction. CHAPTER 7 SAMPLE CALCULATIONS. Representative fraction definition is - a map scale in which figures representing units (as centimeters, inches, or feet) are expressed in the form of the fraction 1/x (as 1/250,000) or of the ratio 1:x to indicate that one unit on the map represents x units (as 250,000 centimeters) on the earth's surface. The use of SI units in engineering drawings, including "dual dimensioning", is covered in this chapter. Engineering Drawing is one of the basic courses to study for all engineering disciplines. Definition A scale is defined as the ratio of the linear ... Representative fraction (R.F.) x max. Isometric Drawing 4. 2. Introduction to Engineering Graphics, Drawing instruments and accessories, BIS - SP 46. = Dimension of an object on sheet / Actual dimension of an object. b length of scale (in cm) = r.f. It is a ratio of any dimension of the object shown in the drawing to that of the actual dimension of the object. Use of plane scales and Representative Fraction. GUJARAT TECHNOLOGICAL UNIVERSITY Engineering Graphics 1. A Text book of Engineering Drawing Plane Solid Geometry N.D. Bhatt.Dhananjay A Jolhe, Engineering Drawing, Tata McGraw Hill, 2007. Its representative fraction (RF) is _____ 1/100 16 The size of the letter is described by its _____ height 17 The area of a field is 50000 m2. CHAPTER 6 ENGINEERING DRAWINGS. use following formulas for the calculations in this topic. 10mm 1 metre 10mm 1000mm = = 1 100 Suppose a line of 10 mm length in drawing represent 1 mm length of object R.F. 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