Define representative fraction. D. xref length to be measured in cm. 1. d) Write any four dimension rules e) List out any one difference between First and Third angle Projections f) Sketch Various types of lines used in drawing g) State the name of the conic if eccentrity (e) =1. The first unit is subdivided into smaller parts. Therefore, the representative fraction (R.F.) x��Vێ�0}�W�q�����vѪR[�m�>�؅�"T@/��{;N&�F�}jP��������r)��2}ИWl�^�y�ܳ�FJ�|z��v��n�'���o��K�W��u�S�c��ח�]1=pW���# ��X��M�eh��d[����pF2?���٢N!UK��l�l˃0�+yl�+����G���-`�I��Ή��p�������ƤFY�`F���� ��Ud�7�.�� ��Ơt1�9g�D�M�$�F��}��&cJڀز[����}��ׇ�2��2g�����.*��M�Z�Y������[D��K�|? = Dimension of an object on sheet / Actual dimension of an object =���#��o�e`N��G�$!�xq(d�u�Cڐ�G-n���⤣6f���������&�q �.�����mz��D?m����}a��I���06 )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. A. Draw plain scale & indicate 270 km and 120 km. For an in-depth look at both engineering and architectural scales, check out this tutorial on CAD Scale Factors by ArchToolbox. B. Engineering Drawing is one of the basic courses to study for all engineering disciplines. The scale generally used in architectural drawings, for example, is 14 inch to one foot, which means that 14 of an inch on the drawing equals one foot on the building being drawn. There is a ‘Representative fraction’ (RF) and it is defined as? Representative Fraction (R.F) : It is the ratio of the distance on the map to the corresponding distance on the ground taken as same units. 180 0 obj<>stream :�_�ËtN�'�-%�&���������ۨI��N �ÿq��,:�_�D�+g��h�����bqZ�����b��T蜔��謜�W�endstream 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 When a 1 cm long line in a drawing represents 1 Map - Map - Map scales and classifications: Map scale refers to the size of the representation on the map as compared to the size of the object on the ground. Representative Fraction - The Ratio of length of the drawing to the actual length of the object represented is called Representative Fraction (R.F). 6. What is the type of scale in which the representative fraction is 1:1? These plans, made by the steel fabricator, are assembly drawings for the steel structure: A line of 1 meter is shown by 1cm on a scale. 160 0 obj <> endobj Summer – … Type of scales. representative fraction (r.f. This list includes abbreviations common to the vocabulary of people who work with engineering drawings in the manufacture and inspection of parts and assemblies. K���Tމ}�d��;�4��4���wq��H�EE� b) Define Eccentricity c) Discuss the areas where engineering drawing can be applied. 0 endobj 0000015428 00000 n 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. %�쏢 The scales adopted for civil engineering drawings depends upon the degree of accuracy and detail required. K0�{�^|��{�r�~”�ekH�ӝX_����c�O�ǫ~�p'�c�~?�~�d[�{`k�<6eߡ6��zL�a�ٳgU��� �mT.�&Dc��t�=_1��)��3����֐� o����W��ܵ�F�v)~�Y'endstream = Dimension of an object on sheet / Actual dimension of an object. Or it is also called Scale factor. Enabling Objectives 1) You will be able to identify the difference between engineer (civil) and architect scales. •A plain scale consists of a line divided into suitable number of equal units. here the ratio called representative factor is more than unity. Plain Scale_Problem 2 . or scale factor (S.F.)? use following formulas for the calculations in this topic. 17 0 obj Winter – 2014 (Old) 8. ... Engineering Drawing by ND Bhatt. 0000011920 00000 n Plain and diagonal scale. 0000000716 00000 n a) Enlarged scale b) Reduced scale c) Full size scale d) Graphical scale View Answer The scales adopted for civil engineering drawings depends upon the degree of accuracy and detail required. 0000001374 00000 n Engineering drawing is a graphical language of an engineer to convey one’s ideas most effectively, easily, conveniently and with high speed. = = = xcm cm m cm R F. Plain scale. %PDF-1.4 %���� Understanding Scale and Representative Fraction . trailer stream 9 0 obj 1:50000 can be shown as 1/50000 as well. Engineering drawing abbreviations and symbols are used to communicate and detail the characteristics of an engineering drawing. - R.F. area of drawing v actual area volume as per drwg. .
When a 1 cm long line in a drawing represents 1 metre length of the object,
0000003521 00000 n Ans37:-The ratio of the drawing size of an object to its actual size is called the Representative fraction. The units will be listed on the map, such as 1 inch or 1 centimeter. R.F. Invert the fraction and multiply by 12 to get: 4/1 x 12 = 48; Your scale factor is 48; For calculating the scale factor from an engineering drawing scale, only multiply the feet by 12. Plain scale construction in engineering drawing - Duration: 20:39. startxref 0000011648 00000 n stream The distance between two places is 240km and its equivalent distance on map is 12cm. ; RF = 1: 20,000 RF = 1 The fraction is called “Representative Fraction” or RF. Ans37:-The ratio of the drawing size of an object to its actual size is called the Representative fraction. %PDF-1.3 Reading engineering drawings requires knowledge of the following elements: Scales; Symbols; Projections; Lines; How to Interpret Scales in Engineering Drawings. Representative Fraction The scale of a drawing is indicated by a ratio, called the Representative Fraction (RF) or Scale Factor. stream E.g. Definition A scale is defined as the ratio of the linear ... Representative fraction (R.F.) 598 Reading engineering drawings requires knowledge of the following elements: Scales; Symbols; Projections; Lines; How to Interpret Scales in Engineering Drawings. So if you plan a route with a total distance of 22cm on the map, that would imply that you'll be traveling (22cm x 500m) / 1cm = 11000m or 11km on the ground. (������8�)5t�Nd�7�rc Representative Fraction (RF) - Fractional Scale - Ratio Scale: When a 1 cm long line in a drawing represents 1 meter length of the object, 100 1 1 100 1 1 1 . 0000001417 00000 n 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 If the distance of 300 km is presented as 15 cm on the map find representative fraction.