Page 112 - CITS - ED - Mechanical
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ENGINEERING DRAWING - CITS
Fig 3 Fig 4
Methods of development
Parallel line method (Fig 6i): This is method used for such of those object having parallel elements i.e developing
prisms and single curved surfaces like cylinders, in which all the edges/generators of lateral surfaces are parallel
to each other.
Radial line development (Fig 6ii): It is used for developing the surfaces of pyramids and also for single curved
surfaces like cones, having its apex as centre and the slant edges or generators are taken as radius for drawing
its development. Radial line development has the fold lines, coming from a point which is known as apex.
Intersection: In the context of engineering drawing, the term intersection refers to the common lines that are formed
when two surfaces meet. In fact every edge of a solid is a line of intersection. We are more convinced with the
lines of intersection formed when surfaces of two solid meet. Fig 5 shows the few examples of lines of intersection.
Intersection lines or just intersections are of great importance to both for making drawings for fabrication work.
Fig 5
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CITS :Engineering Drawing (Mechanical) - Exercise 7
