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Published in:
2018 | OriginalPaper | Chapter
13. Development of Surfaces
Author : K. Rathnam
Published in: A First Course in Engineering Drawing
Publisher: Springer Singapore
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Abstract
The development of a three-dimensional object made of thick paper or sheet metal is a plane figure obtained by unfolding the surface of the object onto a plane. The development consists of drawing successive surfaces of the object in its true size. As there is no stretching of the surface in the development, every line on the development shows the true length of the corresponding line on the surface. Polyhedrons and single-curved surfaces (cylinder and cone) are developable. Double-curved surfaces cannot be developed to their true sizes, because these surfaces contain no straight lines.