3. Draw the surface pattern by constructing one

this is by drawing diagonals that split the sides into two

triangle at a time (view C).

triangles. These diagonals are usually drawn as dotted

lines to separate them from other elements. Then, the

The fitting in figure 14-56 has a warped surface. Its

true length of each element is found, and the surface

base is round and its top is oblong. The following

pattern developed by constructing each triangle in turn.

method for development consists of dividing the

To find the true-length lines, draw a true-length

surface into quadrilaterals of about the same size. A

diagram.

quadrilateral is a plane figure having four sides and four

angles. A diagonal is then drawn across each of these

1. Draw the orthographic views with the bend lines

to produce two triangles. When the true lengths of these

and the diagonals (view A).

elements have been found, the surface pattern may be

2. Draw a true-length diagram of these elements

drawn triangle by triangle.

(view B).

14-35

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