Forging new generations of engineers Assembly Drawings , Balloons , and Parts Lists Working Drawings
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A design that has been approved for prototype or full-scale manufacture requires a set of working drawings to communicate the object’s geometry to everyone involved with its manufacture and assembly.
Working drawings are a complete set of documents that include:
An assembly drawing shows how all of the parts of a multi-component design fit together, and are generally depicted as one or more orthographic projections.
One or more full section views are often used in an assembly drawing to show necessary internal features.
Assembly drawings may contain the following:
Design assemblies are used to show various relationships between components.
The design assembly at the right shows the kinematic relationship that exists between the fly wheel’s 360° rotation, and the extreme angular motion of the piston cylinder body.
Design assemblies are often made from sketches during the preliminary phases of a design process to study the relationships that exist between the components before the design is modeled.
A general assembly is the most common type of assembly drawing. It is displayed as a multiview drawing and may contain a section view.
General assemblies do not contain dimensions.
A detail assembly is a combination of an assembly view with several of its parts depicted as dimensioned multiview drawings on one drawing sheet.
This practice, though not common, reduces the number of drawing sheets needed, and is more appropriate for designs with small numbers of components.
Complex or large assemblies may be communicated through subassembly drawings.
Pictorial assemblies are often used in catalogs, journal articles, and advertisements.
This pictorial is sectioned to show interior details.
Exploded pictorial assembly drawings are commonly used to show how individual components fit together.
A balloon is a circle that contains a single number, which is connected to an assembly component with a leader line.
A parts list is a table that contains information about each of the parts contained in an assembly. The item numbers correspond with the balloon numbers.
Items commonly found in a parts list include:
The location of a parts list usually depends on company standards. Common locations include: