Understanding Industrial Blueprints 177
There are various types and versions of assembly drawings including:- Layout assembly drawings initially used in development of a new product.
- Exploded assembly drawings pictorially showing parts laid out in their correct order of assem-
bly, found in machinery catalogs designed for homeowners or suppliers for ordering parts (Fig-
ure 7.14). - Diagram assembly drawings use conventional symbols and are used to show the approximate
location and/or sequence of the components to be assembled or disassembled. - Working assembly drawings are fully dimensioned and noted. When applied to very simple
products, they can act as alternatives to detail drawings. - Installation assembly drawings are used to show how to install large components of equipment.
As mentioned earlier, an assembly drawing is a drawing of various parts of a machine or structure
in their relative working positions. An assembly drawing essentially conveys the completed shape of the
product as well as its overall dimensions, relative position of the different parts, and the functional rela-
tionship of its components. When all the parts are produced using their respective machining detail draw-
Figure 7.13 A sectioned assembly drawing with a bill-of-materials table (source: College of Engineering, Ohio
State University).