176 Chapter 7
A complete assembly drawing is a presentation of the product or structure put together, showing the
various components in their operational positions. The separate components come to the assembly de-
partment after their manufacturing processes are finished, and here they are put together according to
the assembly drawings.
Many products consist of more than one part or component. A bill of materials (BOM) or list of com-
ponent parts is often included on an assembly drawing to facilitate the assembly, as well as necessary
dimensions and component labeling (Figure 7.13). A three-dimensional picture of a complete assembled
unit would help the reader to understand the final shape of the assembly. Front, side, and top views may
be critical to communicate dimensions or shapes to the reader. If the assembly drawing is actually one
of several subassemblies, the print should indicate this in the title block or bill of materials. Movements
of components in an assembly detail drawing should be indicated with the use of phantom lines.
Figure 7.12 A typical machine detail drawing (source: Middle East Technical University).