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Graphic Communication

Graphic Communication. Scale Drawings. Scale Drawings. Scale drawings are used to draw an object to a proportion of its real size to offer a real life size in proportion to other scaled objects around it. They are particularly useful when modelling an area. Scale Drawings.

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Graphic Communication

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  1. Graphic Communication Scale Drawings Designed by Barry Forbes

  2. Scale Drawings • Scale drawings are used to draw an object to a proportion of its real size to offer a real life size in proportion to other scaled objects around it. • They are particularly useful when modelling an area. Designed by Barry Forbes

  3. Scale Drawings • When we draw an object to scale we either make it larger or smaller. • If, in real life, the object is very large then we will probably want to make it smaller. • On the other hand, if, in real life, the object is very small then we will probably want to make it larger. Designed by Barry Forbes

  4. Scale Drawings • Some examples of scales that are drawn larger than the object in real life are shown below: • 2:1 - 2 units on drawing = 1 in real life • 3:2 - 3 units on drawing = 2 in real life • 5:1 - 5 units on drawing = 1 in real life • 50:1 - 50 units on drawing = 1 in real life Designed by Barry Forbes

  5. Scale Drawings • These scales can be worked out as follows: • 3:2 = 3/2 as expressed as a fraction • This means that the dimension x 3 then divided by 2 is the size of the scaled length. Designed by Barry Forbes

  6. Scale is 3:2 therefore can be written as 3 2  3 x 20 60 = = 30 2 2  The scaled dimension is 30mm Scale Drawings • Worked example: Write the dimension on the right at a scale of 3:2 20 Designed by Barry Forbes

  7. Scale Drawings • Some examples of scales that are drawn smaller than the object in real life are shown below: • 1:2 - 1 unit on drawing = 2 in real life • 2:3 - 2 units on drawing = 3 in real life • 1:50 - 1 unit on drawing = 50 in real life • 1:2500 - 1 unit on drawing = 2500 in real life Designed by Barry Forbes

  8. Scale Drawings • These scales can be worked out as follows: • 1:50 = 1/50 as expressed as a fraction • This means that the dimension x 1 then divided by 50 is the size of the scaled length. Designed by Barry Forbes

  9. Scale Drawings • Worked example: 2000 Write the dimension on the right at a scale of 1:50 Scale is 1:50 therefore can be written as 1 50  1 x 2000 2000 = = 40 50 50  The scaled dimension is 40mm Designed by Barry Forbes

  10. Scale Drawings - Rules • If a scale is written with a larger number first then the drawing is larger than real life. E.g. 2:1 is double real life size. • If a scale is written with a smaller number first then the drawing is smaller than real life. E.g. 1:2 is half real life size. Designed by Barry Forbes

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