Representative Fraction

The ratio of the drawing to the object is called the Representative Fraction. 598 If the scale were 0000002825 00000 n What is the type of scale in which the representative fraction is 1:1? = Dimension of an object on sheet / Actual dimension of an object. For an in-depth look at both engineering and architectural scales, check out this tutorial on CAD Scale Factors by ArchToolbox.

6. 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. stream 4 If the 10m length is represented as 1 mm on the map then representative fraction is A) 1/100 B) 1/1000 C) 1/10 D) None of these 5 The 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. Definition A scale is defined as the ratio of the linear ... Representative fraction (R.F.) 0000001417 00000 n 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. Diagonal Scale_Problem 1 . Scales: Representative fraction. To draw a scale, need to know the “Representative Factor (RF)”. 72 108 120 150 ‘Representative fraction’ (RF) is defined as. R.F. Engineering Drawing is one of the basic courses to study for all engineering disciplines. The first unit is subdivided into smaller parts. 1. a) What is a Representative Fraction? 9 0 obj 0000001374 00000 n E.g. R.F. When a 1 cm long line in a drawing represents 1 Reading engineering drawings requires knowledge of the following elements: Scales; Symbols; Projections; Lines; How to Interpret Scales in Engineering Drawings. = = = xcm cm m cm R F. Plain scale. 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. 1. K���Tމ}�d��;�4��4���wq��H�EE� <> 17 0 obj Define representative fraction. area of drawing v actual area volume as per drwg. 0000001670 00000 n 6. startxref Enabling Objectives 1) You will be able to identify the difference between engineer (civil) and architect scales. C. Graphical scale : There is a ‘Representative fraction’ (RF) and it is defined as? x��Y�r7}���GBaE��� P��i������(y������ ����� ��L�7d��В�iI�(Qa`~g�v ���""�20P�1]�5�r�+�S.lڣ�pںE>���0R�{J�8�R[q?�єè�w&�x��; ��! Therefore, the representative fraction (R.F.) x�b```a``��|��������x$��"l�d�$���!�fɮ|cҽc����ׇ��s7"��c�{�gE��t�2930�1��1��:3;��֙�%|��f�e�G�"�&�6#��q�Ж�© 6X�l+PYKf[l�Q��sbA�� �90]��쒮a� �AF���T��IE ... Engineering Drawing by ND Bhatt. Hence the scale is enlarging scale. 0000003961 00000 n Engineering drawing abbreviations and symbols are used to communicate and detail the characteristics of an engineering drawing. D. scales in engineering 1. for full size scale r.f.=1 or ( 1:1 ) means drawing & object are of same size. ME 111: Engineering Drawing Lecture 3 05-08-2011 SCALES AND Engineering Curves Indian Institute of Technology Guwahati Guwahati – 781039. Scales on Drawing Sheet i) Representative fraction … the drawing is five times bigger than the actual object. x��UKo�0��W���F�I7l�9�����I[�d��'Œgg��b0'q����(�(A���?UX��Qd�ͧ"�6�(I�|����j'�w��Ζ�:�b��^.�������A-�����{����1Yt�����|��[�:S�e�C��!�o��{�˗o�=��w(� �q���\�����g�&�ׂ�����֠(Af*V�r\T�+T�K�2V>�����P�j���4�����|��� !��v�zp^_R�|4s��2Pi ���7Z���r9�6��Q�{�|� .��8�[M7�-�F�Ey�~���Fdb�9u�zh���7|l$�a��IY�Q.P�Y����ZnǤ΅��� ������&�/S�s�&O��`�Aj��ʼ�ȴ5�Պ�=19s�r�F�Z#������t��j�x�o��"P�_��.2���i}�4���^�Y� 8 0 obj A. or scale factor (S.F.)? Representative Fraction (RF) - Fractional Scale - Ratio Scale: Importance of Engineering Drawing. use following formulas for the calculations in this topic. 0000000016 00000 n The scales adopted for civil engineering drawings depends upon the degree of accuracy and detail required. ‘Representative fraction’ (RF) is defined as the ratio of (a) Length of an object in the drawing to actual length of the object (b) Length of an object in the drawing to isometric length of the object If the distance of 300 km is presented as 15 cm on the map find representative fraction. <> If the scale is a representative fraction (and looks like 1/100,000), multiply the distance of the ruler by the denominator (100,000 in this case), which denotes distance in the ruler units. 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. The units will be listed on the map, such as 1 inch or 1 centimeter. 0000018016 00000 n Ans37:-The ratio of the drawing size of an object to its actual size is called the Representative fraction. %PDF-1.4 %���� Representative fraction (R.F.) <> (������8�)5t�Nd�7�rc 23 0 obj is less than unity is drawn on reduced scale, if greater than unity enlarging scale, if equal to one full scale. b) Define Eccentricity c) Discuss the areas where engineering drawing can be applied. The distance between two places is 240km and its equivalent distance on map is 12cm. other rfs are described as 1:10, 1:100, 1:1000, 1:1,00,000 scales dimensions of large objects must be reduced to accommodate on standard size drawing sheet.this reduction creates a scale of that reduction ratio, which is generally a fraction.. The actual length of the object / Length of an object in the drawing B. Isometric length of the object / Length of an object in the drawing C. Length of an object in the drawing / Actual length of the object D. Length of an object in the drawing / … Ans37:-The ratio of the drawing size of an object to its actual size is called the Representative fraction. 0000000716 00000 n B. Reading engineering drawings requires knowledge of the following elements: Scales; Symbols; Projections; Lines; How to Interpret Scales in Engineering Drawings. 6. 1:50000 can be shown as 1/50000 as well. Type of scales. 0000002135 00000 n ... ISOMETRIC DRAWINGS. is A) Cubic centimeter B) Square centimeter C) Centimeter D) None of … R.F. endobj Plain and diagonal scale. v actual volume b dimensions of large objects must be reduced to accommodate on standard size drawing sheet.this reduction creates a scale of that reduction ratio, which is generally a fraction.. such a scale is called reducing scale and that ratio is called representative factor. Summer – … xref %�쏢 This list includes abbreviations common to the vocabulary of people who work with engineering drawings in the manufacture and inspection of parts and assemblies. 0000003334 00000 n .

When a 1 cm long line in a drawing represents 1 metre length of the object,

Its Representative fraction (RF) is Length of a line in the drawing RF =-----Actual length of the line on the object The terms ‘scale’ and ‘RF’ are synonymous. Draw plain scale & indicate 270 km and 120 km. The actual length of the object / Length of an object in the drawing B. Isometric length of the object / Length of an object in the drawing C. Length of an object in the drawing / Actual length of the object D. Length of an object in the drawing / … This means, 1 cm on the drawing represents 10 m on the ground, the scale of the map is 10 m to 1 cm. 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 0000011920 00000 n - R.F. @���͑Ie`T�����III) �'Q` ���@��� ; RF = 1: 20,000 RF = 1 Ans38 – The following are the main uses of scale in engineering practice. Engineering drawing is a graphical language of an engineer to convey one’s ideas most effectively, easily, conveniently and with high speed. :�_�ËtN�'�-%�&���������ۨI��N �ÿq��,:�_�D�+g��h�����bqZ�����b��T蜔��謜�W�endstream Representative fractions are expressed in the form of 1 followed by a : (colon) and then a number, where the one is the numerator in the fraction, the colon represents the division operation, and the other number is the denominator. Representative Fraction The scale of a drawing is indicated by a ratio, called the Representative Fraction (RF) or Scale Factor. These "representative fraction" scales mean that one unit of measurement on the map 1 inch or 1 centimeter represents 10,000 of the same units on the ground. If the scale were 683 endobj 0000001550 00000 n A. ���ʮ��91�@y 6NR�?�4�����6Y*X7�����>3��ș�#��q> �C4�x�C6n.���1R#l�O����홌-w���̛�d��rT�2���4���}:�@��>���٧. 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