Page 48 - ENGINEERING DRAWING

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3.4.3 Constructions

Example 1 :
Draw the Top, Front and side views of the rectangular prism of base 30 x 20 mm

and height 40 mm.

Figure 3.11 : Rectangular prism

Procedure :

➢ Draw xy line of convenient length.

➢ Draw a rectangle a'b'c'd' on the xy line. This will be the elevation of the prism.

➢ Project the vertical sides of the elevation (a'd' and b'd') downwards beyond xy
line.

➢ Draw a horizontal line fg approximately 20 mm below xy line.

➢ Draw a rectangle fgba of 30 x 20 mm size. This will be the plan of the prism.

➢ Project points b' and c' horizontally a convenient length to the right side of the
elevation.

➢ Transfer the width of plan gb by arc and locate points e"d" on the xy line.

➢ Project e"d" vertically up and locate points f"a"d"e" is the left side view of the

prism.