GUJARAT TECHNOLOGICAL UNIVERSITY Engineering Graphics 1. R.F. representative fraction (r.f. Rationale: Engineering Drawing is an effective language of engineers. or scale factor (S.F.)? 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. 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. b length of scale (in cm) = r.f. A Text book of Engineering Drawing Plane Solid Geometry N.D. Bhatt.Dhananjay A Jolhe, Engineering Drawing, Tata McGraw Hill, 2007. Depending on R.F, scales can be divided into three categories: 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 It is a ratio of any dimension of the object shown in the drawing to that of the actual dimension of the object. x max. What is R.F in Engineering drawing? Content : 1. Definition A scale is defined as the ratio of the linear ... Representative fraction (R.F.) Introduction to Engineering Graphics, Drawing instruments and accessories, BIS - SP 46. 5. Conventional Practices for Orthographic and Sectional Views (Full and Half Section) 2. length to be measured in cm. Engineering drawing II tutorial solution is prepared to help engineering students to score good marks in the IOE Exam. Elementary Engineering Drawing by N.D.Bhatt Charotar Publishing.Importance of Engineering Drawing, Scales: Representative Fraction, Type of. ME111: Engineering Drawing ... A line of 1 meter length is shown by 1 cm on the drawing sheet. CHAPTER 6 ENGINEERING DRAWINGS. Isometric Drawing 4. 6. 1:50000 can be shown as 1/50000 as well. Conventional Practices for Orthographic and Sectional Views (Other Type Sections) 3. 2. The full form of R.F is representative fraction. = Dimension of an object on sheet / Actual dimension of an object. 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. Methods for converting toleranced dimensions to SI are presented. 10mm 1 metre 10mm 1000mm = = 1 100 Suppose a line of 10 mm length in drawing represent 1 mm length of object 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. ME 111: Engineering Drawing Lecture 3 05-08-2011 SCALES AND Engineering Curves Indian Institute of Technology Guwahati Guwahati – 781039. Engineering Drawing is one of the basic courses to study for all engineering disciplines. The length and width of the field, on the map is 10 Here such a scale means that one unit of measurment on the map is equal to 50000 of the same unit on the ground. CHAPTER 7 SAMPLE CALCULATIONS. use following formulas for the calculations in this topic. Use of plane scales and Representative Fraction. here the ratio called representative factor is more than unity. 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. Q37 – What is the representative fraction (R.F.) The use of SI units in engineering drawings, including "dual dimensioning", is covered in this chapter. NPTEL provides E-learning through online Web and Video courses various streams. R.F=(Drawing dimension / actual dimension) Classification of scales depending on R.F. 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