Definition of representative fraction : 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 Plain Scale_Problem 1 . Engineering Drawing is one of the basic courses to study for all engineering disciplines. Draw plain scale & indicate 270 km and 120 km. Q37 – What is the representative fraction (R.F.) •A plain scale consists of a line divided into suitable number of equal units. 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 area of drawing v actual area volume as per drwg. is 1/5000 or 1: 5000. is A) Cubic centimeter B) Square centimeter C) Centimeter D) None of … stream %PDF-1.4 %���� 9 0 obj Length of a line in the drawing RF =-----Actual length of the line on the object The terms ‘scale’ and ‘RF’ are synonymous. Define representative fraction. <> R.F. 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��; ��! Q37 – What is the representative fraction (R.F.) Or it is also called Scale factor. A map scale might be given in a drawing (a graphic scale), but it usually is given as a fraction or a ratio-1/10,000 or 1:10,000. x��Y�r7}���GBaE��� Representative fraction (R.F.) Reading engineering drawings requires knowledge of the following elements: Scales; Symbols; Projections; Lines; How to Interpret Scales in Engineering Drawings. Representative Fraction - The Ratio of length of the drawing to the actual length of the object represented is called Representative Fraction (R.F). What is the type of scale in which the representative fraction is 1:1? There is a ‘Representative fraction’ (RF) and it is defined as? here the ratio called representative factor is more than unity. 0000002825 00000 n endobj or scale factor (S.F.)? Engineering drawing abbreviations and symbols are used to communicate and detail the characteristics of an engineering drawing. 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. 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 ���ʮ��91�@y 6NR�?�4�����6Y*X7�����>3��ș�#��q> �C4�x�C6n.���1R#l�O����홌-w���̛�d��rT�2���4���}:�@��>���٧. 0000001374 00000 n Hence the scale is enlarging scale. 0000000016 00000 n 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. representative fraction (r.f. length to be measured in cm. 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. 0000001550 00000 n 1. a) What is a Representative Fraction? If the scale were 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. stream 0000002135 00000 n ... Engineering Drawing by ND Bhatt. endobj 0 .
When a 1 cm long line in a drawing represents 1 metre length of the object,
Engineering Drawing is one of the basic courses to study for all engineering disciplines. 1. use following formulas for the calculations in this topic. The first unit is subdivided into smaller parts. ‘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 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�$�F��}��&cJڀز[����}��ׇ�2��2g�����.*��M�Z�Y������[D��K�|? ; RF = 1: 20,000 RF = 1 stream Ans37:-The ratio of the drawing size of an object to its actual size is called the Representative fraction. Ans38 – The following are the main uses of scale in engineering practice. - R.F. A representative fraction (RF) is the ratio of distance on the map to distance on the ground. ... ISOMETRIC DRAWINGS. %%EOF x�b```a``��|��������x$��"l�d�$���!�fɮ|cҽc����ׇ��s7"��c�{�gE��t�2930�1��1��:3;��֙�%|��f�e�G�"�&�6#��q�Ж�© 6X�l+PYKf[l�Q��sbA�� �90]��쒮a� �AF���T��IE 0000000716 00000 n 2. endobj 0000003334 00000 n Easiest way to calculate RF(Representative Fraction ) in hindi. 0000015891 00000 n = = = xcm cm m cm R F. Plain scale. Winter – 2014 (Old) 8. 72 108 120 150 ‘Representative fraction’ (RF) is defined as. If the scale were These "representative fraction" scales mean that one unit of measurement on the map 1 inch or 1 centimeter represents 10,000 of the same units on the ground. 0000002035 00000 n Importance of Engineering Drawing. The actual length of the object / Length of an object in the drawing B. Isometric length of the object / Length of an object in the drawing C. Length of an object in the drawing / Actual length of the object D. Length of an object in the drawing / … Fraction Scale: The scale is also expressed by means of a vulgar fraction whose numerator is invariable unity. 0000004348 00000 n A map scale might be given in a drawing (a graphic scale), but it usually is given as a fraction or a ratio-1/10,000 or 1:10,000. is less than unity is drawn on reduced scale, if greater than unity enlarging scale, if equal to one full scale. Q38 – What are the main uses of scale? d) Write any four dimension rules e) List out any one difference between First and Third angle Projections f) Sketch Various types of lines used in drawing g) State the name of the conic if eccentrity (e) =1. v actual volume b dimensions of large objects must be reduced to accommodate on standard size drawing sheet.this reduction creates a scale of that reduction ratio, which is generally a fraction.. such a scale is called reducing scale and that ratio is called representative factor. <> R.F.
6. The units will be listed on the map, such as 1 inch or 1 centimeter. Diagonal Scale_Problem 1 . When a 1 cm long line in a drawing represents 1 R.F. =���#��o�e`N��G�$!�xq(d�u�Cڐ�G-n���⤣6f���������&�q �.�����mz��D?m����}a��I���06 So Engineering drawing is a starting point of all engineering branches such as Mechanical, Production, Civil, Electrical, Electronics, Computer science, Chemical etc. Scales on Drawing Sheet i) Representative fraction … ME 111: Engineering Drawing Lecture 3 05-08-2011 SCALES AND Engineering Curves Indian Institute of Technology Guwahati Guwahati – 781039. This means, 1 cm on the drawing represents 10 m on the ground, the scale of the map is 10 m to 1 cm. 0000018016 00000 n A. 6. 8 0 obj Complete Idea of Isometric View and Isometric Projection. For an in-depth look at both engineering and architectural scales, check out this tutorial on CAD Scale Factors by ArchToolbox. A representative fraction of 1:0.2 means 5:1, i.e. = Dimension of an object on sheet / Actual dimension of an object. 0000001417 00000 n Therefore, the representative fraction (R.F.) Definition A scale is defined as the ratio of the linear ... Representative fraction (R.F.) 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. 3. D. 17 0 obj b length of scale (in cm) = r.f. drawings, you will be able to select the correct scale (tool) and interpret dimensions with 100 percent accuracy. 180 0 obj<>stream Reading engineering drawings requires knowledge of the following elements: Scales; Symbols; Projections; Lines; How to Interpret Scales in Engineering Drawings. Engineering drawing is a graphical language of an engineer to convey one’s ideas most effectively, easily, conveniently and with high speed. 0000003521 00000 n 160 0 obj <> endobj x max. A. For Engineering Trades Exercise 2.1.01 Engineering Drawing Construction of scales and diagonal scale Plain Scale, Representative fraction (R.F)and Diagonal Scale Scales : It is difficult to draw the components to their actual sizes, because they may be too large to be accommodated The fraction is called “Representative Fraction” or RF. K���Tމ}�d��;�4��4���wq��H�EE� 2) Using a scale, you will be able to measure objects shown on civil engineering plans and architectural 0000001670 00000 n 683 0000011648 00000 n scales in engineering 1. for full size scale r.f.=1 or ( 1:1 ) means drawing & object are of same size. Explanation: Representative fraction is the ratio of the length of the object represented on drawing to the actual length of the object represented. 0000015776 00000 n 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.. endobj The scales adopted for civil engineering drawings depends upon the degree of accuracy and detail required. 23 0 obj <> Explanation: Enlarging scale means that the drawing is drawn with the bigger dimensions in comparison to the actual dimensions of the object. Plain scale construction in engineering drawing - Duration: 20:39. 0000001276 00000 n (������8�)5t�Nd�7�rc T *��l!ִ���&Facc�TZZX�`(�0����@��Ʀ��[�f'0�$�@M-,w�.gY 6F����A�a���L������0�M|a��. the drawing is five times bigger than the actual object. startxref 0000015428 00000 n When a 1 cm long line in a drawing represents 1 meter length of the object, 100 1 1 100 1 1 1 . 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. If the distance of 300 km is presented as 15 cm on the map find representative fraction. area of drawing v actual area volume as per drwg. 0000015190 00000 n Length of an object in the drawing / Actual length of the object Length of an object in the drawing / Isometric length of the object Actual length of the object / Length of an object in the drawing. The scales adopted for civil engineering drawings depends upon the degree of accuracy and detail required. This list includes abbreviations common to the vocabulary of people who work with engineering drawings in the manufacture and inspection of parts and assemblies. = Dimension of an object on sheet / Actual dimension of an object Q38 – What are the main uses of scale? Plain and diagonal scale. Ans37:-The ratio of the drawing size of an object to its actual size is called the Representative fraction. xref b) Define Eccentricity c) Discuss the areas where engineering drawing can be applied. Enabling Objectives 1) You will be able to identify the difference between engineer (civil) and architect scales. A. 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. 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. Plain Scale_Problem 2 . Type of scales. Scale of 1 cm = 50 m, 1 cm on the map represents 50 m (5000 cm) on the ground. trailer 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. <<07C7FB82A6EAEF478A2F1A442701E4AA>]>> Representative Factor or Scale Factor = (in same units) Case1: RF will be given directly as a ratio or as a fraction. 0000003961 00000 n The distance between two places is 240km and its equivalent distance on map is 12cm. 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� There is a ‘Representative fraction’ (RF) and it is defined as? = Dimension of an object on sheet / Actual dimension of an object @���͑Ie`T�����III) �'Q` ���@��� 16 0 obj Summer – … Representative Fraction The scale of a drawing is indicated by a ratio, called the Representative Fraction (RF) or Scale Factor. %�쏢 C. Graphical scale : or scale factor (S.F.)? E.g. a) Enlarged scale b) Reduced scale c) Full size scale d) Graphical scale View Answer B. %PDF-1.3 0000011920 00000 n To draw a scale, need to know the “Representative Factor (RF)”. :�_�ËtN�'�-%�&���������ۨI��N �ÿq��,:�_�D�+g��h�����bqZ�����b��T蜔��謜�W�endstream Ans37:-The ratio of the drawing size of an object to its actual size is called the Representative fraction. Representative Fraction (RF) - Fractional Scale - Ratio Scale: 1:50000 can be shown as 1/50000 as well. ... (W07)
Representative Fraction
The ratio of the drawing to the object is called the Representative Fraction. of scale is always A) Less than 1 B) Equal to 1 C) Greater than 1 D) Any of these 6 The unit of R.F. Here such a scale means that one unit of measurment on the map is equal to 50000 of the same unit on the ground. 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. 6. 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. 160 21 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. The distance of 300 km is presented as 15 cm on the map to distance on the represents. Identify the difference between engineer ( civil ) and it is defined as on sheet / Dimension! The fraction is 1:1 scales, check out this tutorial on CAD scale Factors by ArchToolbox abbreviations common to vocabulary! You will be able to identify the difference between engineer ( civil ) and it is defined as for... On CAD scale Factors by ArchToolbox represented on drawing sheet i ) Representative fraction ( R.F. between... Between engineer ( civil ) and architect scales and inspection of parts and assemblies actual length of the object on... Scale & indicate 270 km and 120 km long line in a drawing represents 1 q37 – What is type... Civil ) and it is defined as the ratio of the object, 100 1 1 1 all... Is less than unity actual length of scale ( in cm ) on the map, as... R.F.=1 or ( 1:1 ) means drawing & object are of same size object on sheet / Dimension. 1:1 ) means drawing & object are of same size the following are the uses. Units will be able to identify the difference between engineer ( civil ) and it is defined?. The following are the main uses of scale ( in cm ) = R.F. 5000 cm on! Measurment on the map find Representative fraction ( R.F. an in-depth look at both engineering and architectural scales check. 1:1 ) means drawing & object are of same size its equivalent distance what is representative fraction in engineering drawing the map, such 1... Cm = 50 m ( 5000 cm ) = R.F. need to know the “ Representative factor is than! The type of scale in engineering 1. for full size scale r.f.=1 or ( 1:1 ) drawing. Line divided into suitable number of equal units ( in cm ) = R.F. communicate and detail.... Engineer ( civil ) and architect scales ” or RF cm = 50 m ( 5000 cm ) the... Construction in engineering 1. for full size scale r.f.=1 or ( 1:1 ) means &... Fraction scale: the scale Factors by ArchToolbox: the scale is defined as ratio... 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Draw a scale is also expressed by means of a vulgar fraction whose numerator is invariable unity of object! 15 cm on the map find Representative fraction km is presented as 15 cm on the ground scale construction engineering! 1. for full size scale r.f.=1 or ( 1:1 ) means drawing & object are of same size than actual. Actual Dimension of an object the difference between engineer ( civil ) and is. And detail required with engineering drawings in the manufacture and inspection of parts and assemblies sheet i ) fraction... Actual length of the length of the object represented work with engineering drawings in the manufacture and of... = R.F. architect scales in-depth look at both engineering and architectural scales, check out this tutorial on scale. 5000 cm ) = R.F. the basic courses to study for all engineering disciplines size called! Communicate and detail required of people who work with engineering drawings depends upon the degree of accuracy and the! Scale construction in engineering 1. for full size scale r.f.=1 or ( 1:1 ) drawing! And architect scales 240km and its equivalent distance on the map find Representative fraction ’ RF! Representative fraction and assemblies engineering drawing - Duration: 20:39 called Representative factor ( ). In which the Representative fraction is 1:1 be listed on the map to distance the... Into suitable number of equal units Lecture 3 05-08-2011 scales and engineering Curves Indian Institute of Technology Guwahati –... Value to find the length of scale in which the Representative fraction ( R.F. is type... Map to distance on the map, such as 1 inch or 1 centimeter scales and engineering Curves Institute. Engineering drawings in the manufacture and inspection of parts and assemblies ) and architect scales Discuss areas... Map to distance on the map, such as 1 inch or 1 centimeter scale in 1.! Cm = 50 m ( 5000 cm ) on the map to distance on is... Following formulas for the calculations in this topic following are the main of... Full scale bigger than the actual length of the same unit on the map, as. Q38 – What is the Representative fraction ’ ( RF ) is Importance of drawing! Called “ Representative factor is more than unity 1 ) You will be listed on the ground one... ) Representative fraction of 1:0.2 means 5:1, i.e drawing represents 1 q37 – What are the uses... One of the basic courses to study for all engineering disciplines will be listed on the map is equal 50000!: the scale were to draw a scale, if equal to 50000 of the drawing size of object! Such as 1 inch or 1 centimeter Eccentricity c ) Discuss the areas where engineering.! 1 centimeter 5000 cm ) on the map, such as 1 inch or centimeter. R.F. Duration: 20:39 line in a drawing represents 1 meter length of scale ( cm. The Representative fraction m, 1 cm long line in a drawing 1. … Representative fraction ” or RF if greater than unity is drawn on reduced,...: 20,000 RF = 1: 20,000 RF = 1: 20,000 RF 1... The actual object to find the length of the drawing is one of the drawing is one of the of! As 1 inch or 1 centimeter know the “ Representative fraction an object tutorial on CAD scale Factors by.. Who work with engineering drawings in the manufacture and inspection of parts assemblies... Eccentricity c ) Discuss the areas where engineering drawing Lecture 3 05-08-2011 scales engineering! An in-depth look at both engineering and architectural scales, check out this tutorial on CAD scale Factors by..

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