1:50000 can be shown as 1/50000 as well. 10mm 1 metre 10mm 1000mm = = 1 100 Suppose a line of 10 mm length in drawing represent 1 mm length of object R.F. representative fraction (r.f. CHAPTER 6 ENGINEERING DRAWINGS. Content : 1. length to be measured in cm. x max. ME 111: Engineering Drawing Lecture 3 05-08-2011 SCALES AND Engineering Curves Indian Institute of Technology Guwahati Guwahati – 781039. b length of scale (in cm) = r.f. 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 here the ratio called representative factor is more than unity. 6. 5. Definition A scale is defined as the ratio of the linear ... Representative fraction (R.F.) Isometric Drawing 4. CHAPTER 7 SAMPLE CALCULATIONS. Engineering Drawing is one of the basic courses to study for all engineering disciplines. Engineering drawing II tutorial solution is prepared to help engineering students to score good marks in the IOE Exam. NPTEL provides E-learning through online Web and Video courses various streams. Introduction to Engineering Graphics, Drawing instruments and accessories, BIS - SP 46. Conventional Practices for Orthographic and Sectional Views (Other Type Sections) 3. R.F. What is R.F in Engineering drawing? or scale factor (S.F.)? Rationale: Engineering Drawing is an effective language of engineers. Methods for converting toleranced dimensions to SI are presented. Conventional Practices for Orthographic and Sectional Views (Full and Half Section) 2. When a 1 cm long line in a drawing represents 1 R.F=(Drawing dimension / actual dimension) Classification of scales depending on R.F. The length and width of the field, on the map is 10 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. 2. use following formulas for the calculations in this topic. Use of plane scales and Representative Fraction. Q38 – What are the main uses of scale? Elementary Engineering Drawing by N.D.Bhatt Charotar Publishing.Importance of Engineering Drawing, Scales: Representative Fraction, Type of. Depending on R.F, scales can be divided into three categories: ME111: Engineering Drawing ... A line of 1 meter length is shown by 1 cm on the drawing sheet. It is a ratio of any dimension of the object shown in the drawing to that of the actual dimension of the object. Ans37:-The ratio of the drawing size of an object to its actual size is called the Representative fraction. 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. 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. )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. The full form of R.F is representative fraction. Here such a scale means that one unit of measurment on the map is equal to 50000 of the same unit on the ground. = Dimension of an object on sheet / Actual dimension of an object. Q37 – What is the representative fraction (R.F.) 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